{"id":7960,"date":"2026-09-07T06:47:09","date_gmt":"2026-09-07T06:47:09","guid":{"rendered":"https:\/\/korea-transmission.com\/?post_type=product&#038;p=7960"},"modified":"2026-09-07T08:07:14","modified_gmt":"2026-09-07T08:07:14","slug":"rc-120-rotary-cutter-gearbox-replacement-for-omni-rc-120-gearbox","status":"publish","type":"product","link":"https:\/\/korea-transmission.com\/th\/product\/rc-120-rotary-cutter-gearbox-replacement-for-omni-rc-120-gearbox\/","title":{"rendered":"\u0e0a\u0e38\u0e14\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e2a\u0e33\u0e2b\u0e23\u0e31\u0e1a\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48 RC-120 \u0e02\u0e2d\u0e07 Omni (\u0e0a\u0e38\u0e14\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c Omni RC-120)"},"content":{"rendered":"<p>The RC-120 Rotary Cutter Gearbox Replacement for Omni RC-120 Gearbox is a premium-grade power transmission unit engineered specifically for agricultural machinery across demanding field environments. Designed to serve as a direct drop-in replacement for the OEM Omni RC-120 gearbox, this unit is primarily used to drive rotary knives and cutting assemblies for efficient vegetation management operations, including grass cutting, straw crushing, and brush clearing. Rated from 51 to 161 HP and delivering torque between 803 and 2,252 Nm, it converts the high-speed rotation of a tractor PTO shaft (540 or 1,000 RPM) into stable, high-torque output suitable for even the heaviest cutting loads. Five selectable gear ratios (1.21:1, 1:1, 1:1.21, 1:1.46, 1:1.92) allow the operator to match output speed and torque to the specific crop density or terrain encountered. The bevel gear architecture, triple-lip spring-loaded seals, and tapered roller bearings ensure this agricultural gearbox withstands the relentless shock loads, contamination, and moisture exposure inherent to rotary cutter operation.<\/p>\n<p>This gearbox for rotary cutter applications excels across a wide range of scenarios: slashing overgrown roadsides, cutting thick pasture grass between grazing cycles, mulching post-harvest crop stubble, and clearing brush along fence lines and waterways. The sealed ductile iron housing, weighing 49.9 kg (109 lbs), contains a precision bevel gear set that redirects PTO input through 90 degrees to drive the blade spindle vertically beneath the mower deck. Whether used on finishing mowers, rotary slashers, or heavy-duty rotary cutters, the RC-120 maintains consistent blade speed even as load conditions fluctuate, protecting both the cutting implement and the tractor driveline. For operators seeking a reliable, proven replacement rotary cutter gearbox that installs without modification and performs at OEM specification, the RC-120 from CMN Transmission is the definitive choice.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7849 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/RC-120-Rotary-Cutter-Gearbox.webp\" alt=\"\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48 RC-120\" width=\"800\" height=\"800\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/RC-120-Rotary-Cutter-Gearbox.webp 800w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/RC-120-Rotary-Cutter-Gearbox-480x480.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 800px, 100vw\" \/><\/p>\n<h2>\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\u0e08\u0e33\u0e40\u0e1e\u0e32\u0e30\u0e02\u0e2d\u0e07\u0e1c\u0e25\u0e34\u0e15\u0e20\u0e31\u0e13\u0e11\u0e4c<\/h2>\n<table style=\"width: 100%;\" border=\"1\" width=\"100%\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td style=\"text-align: center;\">\u0e41\u0e1a\u0e1a\u0e2d\u0e22\u0e48\u0e32\u0e07:<\/td>\n<td style=\"text-align: center;\">\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c RC-120<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e01\u0e32\u0e23\u0e08\u0e31\u0e14\u0e2d\u0e31\u0e19\u0e14\u0e31\u0e1a HP<\/td>\n<td style=\"text-align: center;\">51 \u2013 161 HP<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e41\u0e23\u0e07\u0e1a\u0e34\u0e14:<\/td>\n<td style=\"text-align: center;\">7,117 \u2013 19,950 lb.-in.<br \/>\n(803 \u2013 2,252 Nm.)<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e31\u0e15\u0e23\u0e32\u0e2a\u0e48\u0e27\u0e19:<\/td>\n<td style=\"text-align: center;\">1.21:1, 1:1, 1:1.21, 1:1.46, 1:1.92<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e1b\u0e23\u0e30\u0e40\u0e20\u0e17\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c:<\/td>\n<td style=\"text-align: center;\">\u0e40\u0e2d\u0e35\u0e22\u0e07<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e1b\u0e23\u0e30\u0e40\u0e20\u0e17\u0e0b\u0e35\u0e25:<\/td>\n<td style=\"text-align: center;\">\u0e2a\u0e1b\u0e23\u0e34\u0e07\u0e42\u0e2b\u0e25\u0e14\u0e2a\u0e32\u0e21\u0e0a\u0e31\u0e49\u0e19<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e1b\u0e23\u0e30\u0e40\u0e20\u0e17\u0e15\u0e25\u0e31\u0e1a\u0e25\u0e39\u0e01\u0e1b\u0e37\u0e19:<\/td>\n<td style=\"text-align: center;\">\u0e25\u0e39\u0e01\u0e01\u0e25\u0e34\u0e49\u0e07\u0e40\u0e23\u0e35\u0e22\u0e27<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e04\u0e27\u0e32\u0e21\u0e08\u0e38\u0e02\u0e2d\u0e07\u0e19\u0e49\u0e33\u0e21\u0e31\u0e19:<\/td>\n<td style=\"text-align: center;\">60 \u0e2d\u0e2d\u0e19\u0e0b\u0e4c<br \/>\n(1.8 \u0e25\u0e34\u0e15\u0e23)<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e19\u0e49\u0e33\u0e2b\u0e19\u0e31\u0e01:<\/td>\n<td style=\"text-align: center;\">109 \u0e1b\u0e2d\u0e19\u0e14\u0e4c<br \/>\n(49.9 \u0e01\u0e01.)<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e01\u0e32\u0e23\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19:<\/td>\n<td style=\"text-align: center;\">\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e2b\u0e0d\u0e49\u0e32\u0e41\u0e1a\u0e1a\u0e40\u0e01\u0e47\u0e1a\u0e07\u0e32\u0e19<br \/>\n\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e41\u0e1a\u0e1a\u0e2b\u0e21\u0e38\u0e19<br \/>\n\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e41\u0e1a\u0e1a\u0e2b\u0e21\u0e38\u0e19<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>RC-120 Rotary Cutter Gearbox Dimensions<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7909 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/Rotary-Cutter-Gearbox-Dimensions.webp\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1200px, 100vw\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/Rotary-Cutter-Gearbox-Dimensions.webp 1200w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/Rotary-Cutter-Gearbox-Dimensions-980x490.webp 980w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/Rotary-Cutter-Gearbox-Dimensions-480x240.webp 480w\" alt=\"\u0e02\u0e19\u0e32\u0e14\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c\u0e02\u0e2d\u0e07\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48\" width=\"1200\" height=\"600\" \/><\/p>\n<table style=\"width: 100%;\" contenteditable=\"true\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\n<thead>\n<tr>\n<th style=\"text-align: center;\" rowspan=\"2\">\u0e41\u0e1a\u0e1a\u0e2d\u0e22\u0e48\u0e32\u0e07<\/th>\n<th style=\"text-align: center;\" colspan=\"2\">\u0e19\u0e49\u0e33\u0e2b\u0e19\u0e31\u0e01\u0e2a\u0e39\u0e07\u0e2a\u0e38\u0e14\u0e02\u0e2d\u0e07\u0e2b\u0e19\u0e48\u0e27\u0e22<\/th>\n<th style=\"text-align: center;\" colspan=\"2\">CL \u0e16\u0e36\u0e07 Thru Cap A<\/th>\n<th style=\"text-align: center;\" colspan=\"2\">CL \u0e16\u0e36\u0e07\u0e2b\u0e19\u0e49\u0e32\u0e41\u0e1b\u0e25\u0e19 B<\/th>\n<th style=\"text-align: center;\" colspan=\"2\">\u0e2b\u0e19\u0e49\u0e32\u0e41\u0e1b\u0e25\u0e19\u0e16\u0e36\u0e07\u0e14\u0e38\u0e21\u0e19\u0e33\u0e23\u0e48\u0e2d\u0e07 C<\/th>\n<th style=\"text-align: center;\" colspan=\"2\">\u0e40\u0e2a\u0e49\u0e19\u0e1c\u0e48\u0e32\u0e19\u0e28\u0e39\u0e19\u0e22\u0e4c\u0e01\u0e25\u0e32\u0e07\u0e41\u0e01\u0e19\u0e19\u0e33 H<\/th>\n<th style=\"text-align: center;\" colspan=\"2\">\u0e40\u0e2a\u0e49\u0e19\u0e1c\u0e48\u0e32\u0e19\u0e28\u0e39\u0e19\u0e22\u0e4c\u0e01\u0e25\u0e32\u0e07\u0e2b\u0e19\u0e49\u0e32\u0e41\u0e1b\u0e25\u0e19 D1<\/th>\n<th style=\"text-align: center;\" colspan=\"2\">\u0e23\u0e39\u0e1b\u0e41\u0e1a\u0e1a\u0e23\u0e39\u0e2a\u0e25\u0e31\u0e01\u0e40\u0e01\u0e25\u0e35\u0e22\u0e27 E1<\/th>\n<th style=\"text-align: center;\" colspan=\"2\">\u0e23\u0e39\u0e22\u0e36\u0e14 F1<\/th>\n<th style=\"text-align: center;\" colspan=\"2\">\u0e02\u0e19\u0e32\u0e14\u0e2b\u0e19\u0e49\u0e32\u0e41\u0e1b\u0e25\u0e19\u0e2a\u0e35\u0e48\u0e40\u0e2b\u0e25\u0e35\u0e48\u0e22\u0e21 D2<\/th>\n<th style=\"text-align: center;\" colspan=\"2\">\u0e23\u0e39\u0e1b\u0e41\u0e1a\u0e1a\u0e23\u0e39\u0e2a\u0e25\u0e31\u0e01\u0e40\u0e01\u0e25\u0e35\u0e22\u0e27 E2<\/th>\n<th style=\"text-align: center;\" colspan=\"2\">\u0e23\u0e39\u0e22\u0e36\u0e14 F2<\/th>\n<\/tr>\n<tr>\n<th style=\"text-align: center;\">\u0e1b\u0e2d\u0e19\u0e14\u0e4c<\/th>\n<th style=\"text-align: center;\">\u0e01\u0e01.<\/th>\n<th style=\"text-align: center;\">\u0e43\u0e19<\/th>\n<th style=\"text-align: center;\">\u0e21\u0e21.<\/th>\n<th style=\"text-align: center;\">\u0e43\u0e19<\/th>\n<th style=\"text-align: center;\">\u0e21\u0e21.<\/th>\n<th style=\"text-align: center;\">\u0e43\u0e19<\/th>\n<th style=\"text-align: center;\">\u0e21\u0e21.<\/th>\n<th style=\"text-align: center;\">\u0e43\u0e19<\/th>\n<th style=\"text-align: center;\">\u0e21\u0e21.<\/th>\n<th style=\"text-align: center;\">\u0e43\u0e19<\/th>\n<th style=\"text-align: center;\">\u0e21\u0e21.<\/th>\n<th style=\"text-align: center;\">\u0e43\u0e19<\/th>\n<th style=\"text-align: center;\">\u0e21\u0e21.<\/th>\n<th style=\"text-align: center;\">\u0e43\u0e19<\/th>\n<th style=\"text-align: center;\">\u0e21\u0e21.<\/th>\n<th style=\"text-align: center;\">\u0e43\u0e19<\/th>\n<th style=\"text-align: center;\">\u0e21\u0e21.<\/th>\n<th style=\"text-align: center;\">\u0e43\u0e19<\/th>\n<th style=\"text-align: center;\">\u0e21\u0e21.<\/th>\n<th style=\"text-align: center;\">\u0e43\u0e19<\/th>\n<th style=\"text-align: center;\">\u0e21\u0e21.<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-20<\/td>\n<td style=\"text-align: center;\">34<\/td>\n<td style=\"text-align: center;\">15<\/td>\n<td style=\"text-align: center;\">3.0<\/td>\n<td style=\"text-align: center;\">76<\/td>\n<td style=\"text-align: center;\">6.5<\/td>\n<td style=\"text-align: center;\">165<\/td>\n<td style=\"text-align: center;\">2.40<\/td>\n<td style=\"text-align: center;\">61.0<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">6.18<\/td>\n<td style=\"text-align: center;\">157<\/td>\n<td style=\"text-align: center;\">6.8<\/td>\n<td style=\"text-align: center;\">171.5<\/td>\n<td style=\"text-align: center;\">(4) 0.67<\/td>\n<td style=\"text-align: center;\">(4) 17<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-27<\/td>\n<td style=\"text-align: center;\">47<\/td>\n<td style=\"text-align: center;\">21<\/td>\n<td style=\"text-align: center;\">3.5<\/td>\n<td style=\"text-align: center;\">88<\/td>\n<td style=\"text-align: center;\">6.4<\/td>\n<td style=\"text-align: center;\">164<\/td>\n<td style=\"text-align: center;\">2.40<\/td>\n<td style=\"text-align: center;\">61.0<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">6.18<\/td>\n<td style=\"text-align: center;\">157<\/td>\n<td style=\"text-align: center;\">6.8<\/td>\n<td style=\"text-align: center;\">171.5<\/td>\n<td style=\"text-align: center;\">(4) 0.67<\/td>\n<td style=\"text-align: center;\">(4) 17<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-30<\/td>\n<td style=\"text-align: center;\">51<\/td>\n<td style=\"text-align: center;\">23<\/td>\n<td style=\"text-align: center;\">3.9<\/td>\n<td style=\"text-align: center;\">100<\/td>\n<td style=\"text-align: center;\">6.4<\/td>\n<td style=\"text-align: center;\">164<\/td>\n<td style=\"text-align: center;\">3.30<\/td>\n<td style=\"text-align: center;\">84.0<\/td>\n<td style=\"text-align: center;\">2.5<\/td>\n<td style=\"text-align: center;\">63.5<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">6.89<\/td>\n<td style=\"text-align: center;\">175<\/td>\n<td style=\"text-align: center;\">6.8<\/td>\n<td style=\"text-align: center;\">171.5<\/td>\n<td style=\"text-align: center;\">(4) 0.67<\/td>\n<td style=\"text-align: center;\">(4) 17<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-51<\/td>\n<td style=\"text-align: center;\">56<\/td>\n<td style=\"text-align: center;\">25<\/td>\n<td style=\"text-align: center;\">3.7<\/td>\n<td style=\"text-align: center;\">94<\/td>\n<td style=\"text-align: center;\">6.4<\/td>\n<td style=\"text-align: center;\">164<\/td>\n<td style=\"text-align: center;\">3.50<\/td>\n<td style=\"text-align: center;\">88.9<\/td>\n<td style=\"text-align: center;\">2.5<\/td>\n<td style=\"text-align: center;\">63.5<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">6.89<\/td>\n<td style=\"text-align: center;\">175<\/td>\n<td style=\"text-align: center;\">6.8<\/td>\n<td style=\"text-align: center;\">171.5<\/td>\n<td style=\"text-align: center;\">(4) 0.67<\/td>\n<td style=\"text-align: center;\">(4) 17<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-61<\/td>\n<td style=\"text-align: center;\">81<\/td>\n<td style=\"text-align: center;\">37<\/td>\n<td style=\"text-align: center;\">4.2<\/td>\n<td style=\"text-align: center;\">107<\/td>\n<td style=\"text-align: center;\">7.2<\/td>\n<td style=\"text-align: center;\">183<\/td>\n<td style=\"text-align: center;\">3.50<\/td>\n<td style=\"text-align: center;\">88.9<\/td>\n<td style=\"text-align: center;\">2.5<\/td>\n<td style=\"text-align: center;\">63.5<\/td>\n<td style=\"text-align: center;\">9.5<\/td>\n<td style=\"text-align: center;\">242.0<\/td>\n<td style=\"text-align: center;\">8.0<\/td>\n<td style=\"text-align: center;\">203.2<\/td>\n<td style=\"text-align: center;\">(4) 0.787<\/td>\n<td style=\"text-align: center;\">(4) 20<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-71<\/td>\n<td style=\"text-align: center;\">83<\/td>\n<td style=\"text-align: center;\">38<\/td>\n<td style=\"text-align: center;\">4.2<\/td>\n<td style=\"text-align: center;\">107<\/td>\n<td style=\"text-align: center;\">7.2<\/td>\n<td style=\"text-align: center;\">183<\/td>\n<td style=\"text-align: center;\">3.50<\/td>\n<td style=\"text-align: center;\">88.9<\/td>\n<td style=\"text-align: center;\">2.5<\/td>\n<td style=\"text-align: center;\">63.5<\/td>\n<td style=\"text-align: center;\">9.5<\/td>\n<td style=\"text-align: center;\">242.0<\/td>\n<td style=\"text-align: center;\">8.0<\/td>\n<td style=\"text-align: center;\">203.2<\/td>\n<td style=\"text-align: center;\">(4) 0.787<\/td>\n<td style=\"text-align: center;\">(4) 20<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-81<\/td>\n<td style=\"text-align: center;\">98<\/td>\n<td style=\"text-align: center;\">45<\/td>\n<td style=\"text-align: center;\">4.6<\/td>\n<td style=\"text-align: center;\">116<\/td>\n<td style=\"text-align: center;\">11.0<\/td>\n<td style=\"text-align: center;\">279<\/td>\n<td style=\"text-align: center;\">3.50<\/td>\n<td style=\"text-align: center;\">88.9<\/td>\n<td style=\"text-align: center;\">2.5<\/td>\n<td style=\"text-align: center;\">63.5<\/td>\n<td style=\"text-align: center;\">9.6<\/td>\n<td style=\"text-align: center;\">245.0<\/td>\n<td style=\"text-align: center;\">8.0<\/td>\n<td style=\"text-align: center;\">203.2<\/td>\n<td style=\"text-align: center;\">(4) 0.787<\/td>\n<td style=\"text-align: center;\">(4) 20<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-100<\/td>\n<td style=\"text-align: center;\">96<\/td>\n<td style=\"text-align: center;\">44<\/td>\n<td style=\"text-align: center;\">4.8<\/td>\n<td style=\"text-align: center;\">121<\/td>\n<td style=\"text-align: center;\">7.1<\/td>\n<td style=\"text-align: center;\">180<\/td>\n<td style=\"text-align: center;\">3.78<\/td>\n<td style=\"text-align: center;\">96.0<\/td>\n<td style=\"text-align: center;\">2.5<\/td>\n<td style=\"text-align: center;\">63.5<\/td>\n<td style=\"text-align: center;\">9.4<\/td>\n<td style=\"text-align: center;\">240.0<\/td>\n<td style=\"text-align: center;\">8.0<\/td>\n<td style=\"text-align: center;\">203.2<\/td>\n<td style=\"text-align: center;\">(4) 0.787<\/td>\n<td style=\"text-align: center;\">(4) 20<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-130\u0e40\u0e2d\u0e2a<\/td>\n<td style=\"text-align: center;\">109<\/td>\n<td style=\"text-align: center;\">49<\/td>\n<td style=\"text-align: center;\">5.1<\/td>\n<td style=\"text-align: center;\">130<\/td>\n<td style=\"text-align: center;\">7.1<\/td>\n<td style=\"text-align: center;\">180<\/td>\n<td style=\"text-align: center;\">4.00<\/td>\n<td style=\"text-align: center;\">102.0<\/td>\n<td style=\"text-align: center;\">2.9<\/td>\n<td style=\"text-align: center;\">73.0<\/td>\n<td style=\"text-align: center;\">9.8<\/td>\n<td style=\"text-align: center;\">250.0<\/td>\n<td style=\"text-align: center;\">8.0<\/td>\n<td style=\"text-align: center;\">203.2<\/td>\n<td style=\"text-align: center;\">(6) 0.807<\/td>\n<td style=\"text-align: center;\">(6) 21<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-130\u0e41\u0e2d\u0e25<\/td>\n<td style=\"text-align: center;\">120<\/td>\n<td style=\"text-align: center;\">54<\/td>\n<td style=\"text-align: center;\">5.1<\/td>\n<td style=\"text-align: center;\">130<\/td>\n<td style=\"text-align: center;\">7.1<\/td>\n<td style=\"text-align: center;\">180<\/td>\n<td style=\"text-align: center;\">7.20<\/td>\n<td style=\"text-align: center;\">184.0<\/td>\n<td style=\"text-align: center;\">3.8<\/td>\n<td style=\"text-align: center;\">96.0<\/td>\n<td style=\"text-align: center;\">9.8<\/td>\n<td style=\"text-align: center;\">250.0<\/td>\n<td style=\"text-align: center;\">8.0<\/td>\n<td style=\"text-align: center;\">203.2<\/td>\n<td style=\"text-align: center;\">(6) 0.807<\/td>\n<td style=\"text-align: center;\">(6) 21<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-145<\/td>\n<td style=\"text-align: center;\">110<\/td>\n<td style=\"text-align: center;\">50<\/td>\n<td style=\"text-align: center;\">5.6<\/td>\n<td style=\"text-align: center;\">142<\/td>\n<td style=\"text-align: center;\">8.9<\/td>\n<td style=\"text-align: center;\">225<\/td>\n<td style=\"text-align: center;\">8.05<\/td>\n<td style=\"text-align: center;\">204.5<\/td>\n<td style=\"text-align: center;\">3.8<\/td>\n<td style=\"text-align: center;\">96.0<\/td>\n<td style=\"text-align: center;\">10.2<\/td>\n<td style=\"text-align: center;\">260.0<\/td>\n<td style=\"text-align: center;\">8.0<\/td>\n<td style=\"text-align: center;\">203.2<\/td>\n<td style=\"text-align: center;\">(6) 0.807<\/td>\n<td style=\"text-align: center;\">(6) 21<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-150\u0e41\u0e2d\u0e25<\/td>\n<td style=\"text-align: center;\">145<\/td>\n<td style=\"text-align: center;\">66<\/td>\n<td style=\"text-align: center;\">5.1<\/td>\n<td style=\"text-align: center;\">130<\/td>\n<td style=\"text-align: center;\">11.0<\/td>\n<td style=\"text-align: center;\">280<\/td>\n<td style=\"text-align: center;\">7.20<\/td>\n<td style=\"text-align: center;\">184.0<\/td>\n<td style=\"text-align: center;\">3.8<\/td>\n<td style=\"text-align: center;\">96.0<\/td>\n<td style=\"text-align: center;\">9.8<\/td>\n<td style=\"text-align: center;\">250.0<\/td>\n<td style=\"text-align: center;\">8.0<\/td>\n<td style=\"text-align: center;\">203.2<\/td>\n<td style=\"text-align: center;\">(6) 0.807<\/td>\n<td style=\"text-align: center;\">(6) 21<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">\u0e2d\u0e32\u0e23\u0e4c\u0e0b\u0e35-200<\/td>\n<td style=\"text-align: center;\">220<\/td>\n<td style=\"text-align: center;\">100<\/td>\n<td style=\"text-align: center;\">6.4<\/td>\n<td style=\"text-align: center;\">162<\/td>\n<td style=\"text-align: center;\">9.5<\/td>\n<td style=\"text-align: center;\">241<\/td>\n<td style=\"text-align: center;\">8.00<\/td>\n<td style=\"text-align: center;\">203.0<\/td>\n<td style=\"text-align: center;\">5.3<\/td>\n<td style=\"text-align: center;\">135.0<\/td>\n<td style=\"text-align: center;\">11.8<\/td>\n<td style=\"text-align: center;\">300.0<\/td>\n<td style=\"text-align: center;\">10<\/td>\n<td style=\"text-align: center;\">254.0<\/td>\n<td style=\"text-align: center;\">(6) 0.905<\/td>\n<td style=\"text-align: center;\">(6) 23<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<td style=\"text-align: center;\">–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Key Features of the RC-120 Rotary Cutter Gearbox<\/h2>\n<p>1. Terrain Adaptability and Floating Design<br \/>\nThe floating gearbox mounting design allows the cutter deck and blade assembly to ride with ground undulations automatically, preventing the cutting blades from striking buried rocks, hardwood stumps, or irrigation fittings at full operating speed. This adaptive height adjustment is particularly critical when mowing on uneven pasture terrain, sloped embankments, or waterway banks where the ground surface can change rapidly across the working width. The result is reduced shock transmission to the gearbox housing and significantly extended gear and bearing service life.<\/p>\n<p>2. Accessible Field Maintenance Design<br \/>\nRotary cutter gearbox oil maintenance is simplified by externally accessible oil fill ports and a bottom-mounted drain valve that allow complete oil changes without removing the gearbox from the implement. Operators can check the rotary cutter gearbox oil level and add gear oil directly from ground level. The pressure relief plug prevents internal pressure buildup during operation, protecting seals from premature blow-out. This field-serviceable design reduces scheduled maintenance downtime and supports proper rotary cutter gearbox oil change intervals even during peak seasonal workloads.<\/p>\n<p>3. Tractor PTO Drive Compatibility<br \/>\nThe RC-120 connects directly to the tractor\u2019s Power Take-Off (PTO) shaft and fully supports both standard 540 RPM and 1,000 RPM input speeds. The splined input shaft accepts quick-change couplings, enabling fast installation and removal in the field without special tooling. This broad PTO compatibility allows the gearbox to pair with compact utility tractors, mid-range row-crop tractors, and large 4WD agricultural equipment without the need for adapter shafts or custom modifications.<\/p>\n<p>4. Industrial-Grade Durability and Sealing<br \/>\nThe housing is cast from high-strength ductile iron with a Red Oxide primer coating that resists corrosion from mud, water, gravel, and the acidic plant sap encountered in daily agricultural use. Triple-lip spring-loaded oil seals encircle each rotating shaft, creating a three-stage barrier against both gear oil leakage and field contamination ingress. This heavy-duty sealed construction is purpose-built to withstand the abrasive and moisture-laden environment of rotary cutting operations and to protect the tapered roller bearing assemblies from premature failure caused by contaminated lubrication.<\/p>\n<p>5. Multiple Speed Ratios for Any Crop or Terrain<br \/>\nWith five selectable rotary cutter gearbox ratios spanning from 1.21:1 to 1:1.92, this unit covers the complete range of rotary mower gearbox output requirements. Operators managing light grass on flat pasture can select a higher blade speed ratio for a cleaner cut, while those working through dense wetland vegetation or steep slope terrain can shift to a lower-speed, higher-torque ratio to maintain stable cutting power without overloading the tractor. This flexibility makes the RC-120 an outstanding finishing mower gearbox as well as a heavy-duty rotary slasher gearbox depending on the ratio selected.<\/p>\n<p>6. \u0e23\u0e30\u0e1a\u0e1a\u0e1b\u0e49\u0e2d\u0e07\u0e01\u0e31\u0e19\u0e04\u0e27\u0e32\u0e21\u0e1b\u0e25\u0e2d\u0e14\u0e20\u0e31\u0e22\u0e08\u0e32\u0e01\u0e01\u0e32\u0e23\u0e42\u0e2d\u0e40\u0e27\u0e2d\u0e23\u0e4c\u0e42\u0e2b\u0e25\u0e14<br \/>\nThe RC-120 is designed to accept optional free-wheel clutch or shear bolt overload protection systems at the input shaft. When cutting blades strike an immovable obstruction at full speed, the overload device disengages or shears before catastrophic torque is transmitted through the bevel gear set, protecting both the gearbox internals and the tractor\u2019s PTO driveline from breakage. This integrated safety mechanism is especially critical when operating in areas with buried debris, hidden tree stumps, or rocky outcroppings where sudden blade lock-up events cannot be anticipated.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7849 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/RC-120-Rotary-Cutter-Gearbox.webp\" alt=\"\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48 RC-120\" width=\"800\" height=\"800\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/RC-120-Rotary-Cutter-Gearbox.webp 800w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/RC-120-Rotary-Cutter-Gearbox-480x480.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 800px, 100vw\" \/><\/p>\n<h2>\u0e2b\u0e25\u0e31\u0e01\u0e01\u0e32\u0e23\u0e17\u0e33\u0e07\u0e32\u0e19<\/h2>\n<p>The RC-120 Rotary Cutter Gearbox serves as the central power transmission element in any rotary cutter, finishing mower, or rotary slasher implement. Its operating principle begins at the tractor\u2019s Power Take-Off shaft, which delivers rotational energy at either 540 or 1,000 RPM depending on the tractor\u2019s PTO standard and speed selection. This horizontal rotational input enters the gearbox through the hardened alloy steel input shaft, which is supported at both ends by precision tapered roller bearings that manage both the radial loads from gear mesh forces and the axial thrust loads generated during direction changes and load fluctuations.<\/p>\n<p>Inside the ductile iron housing, the input shaft drives the primary bevel gear. The bevel gear set is the heart of the agricultural gearbox\u2019s function, as it redirects the horizontal PTO input through exactly 90 degrees while simultaneously adjusting the speed and torque relationship between input and output. In high-speed ratios such as 1:1.92, the output shaft rotates significantly faster than the input, producing the high blade tip velocity needed for clean grass cutting on a finishing mower gearbox application. In reduction ratios such as 1.21:1, the bevel gears increase output torque relative to input torque, giving the rotary slasher gearbox the mechanical advantage needed to power through thick brush, woody stems, and dense wet vegetation without stalling.<\/p>\n<p>The output shaft exits the base of the housing and transmits drive power directly to the blade carrier spindle below the mower deck. As cutting blades encounter varying material densities throughout a pass, such as cutting thick straw, weeds, or woody brush, the bevel gear set continuously maintains the operator-selected speed ratio while the tapered roller bearings absorb the resulting axial and radial load spikes without deflection. The triple-lip spring-loaded oil seals at both shaft exit points retain the 1.8 liters of gear oil that bathes the gear mesh surfaces and lower bearing races in a continuous lubrication film.<\/p>\n<p>The built-in pressure relief plug regulates internal air pressure within the housing as operating temperature rises, preventing seal failure from internal pressure buildup during extended high-load operation. This self-regulating lubrication and pressure management system is why a properly maintained <a href=\"https:\/\/korea-transmission.com\/th\/rotary-cutter-gearbox\/\"><strong>\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e15\u0e31\u0e14\u0e2b\u0e21\u0e38\u0e19<\/strong><\/a> can sustain continuous operation across a full working day without overheating or oil-related component failure. The carburized alloy steel shafts, precision-forged bevel gears, and heavy ductile iron housing work together as an integrated system to ensure that virtually the entire HP rating of 51 to 161 HP reaches the cutting blades efficiently rather than being lost as heat or vibration within the gearbox itself.<\/p>\n<p>The RC-120\u2019s multi-speed configuration also supports terrain adaptability by allowing operators to select a rotary cutter gearbox ratio suited to the specific field condition encountered: steep slopes and wetlands benefit from higher torque ratios, while flat finished fields are better served by faster blade speed ratios that produce a finer cutting action.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7863 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-2.webp\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1200px, 100vw\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-2.webp 1200w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-2-980x735.webp 980w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-2-480x360.webp 480w\" alt=\"\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48\" width=\"1200\" height=\"900\" \/><\/p>\n<h2>Applications of the RC-120 Gearbox<\/h2>\n<div>\n<h3>\u0e01\u0e32\u0e23\u0e15\u0e31\u0e14\u0e2b\u0e0d\u0e49\u0e32\u0e41\u0e25\u0e30\u0e01\u0e32\u0e23\u0e1a\u0e14\u0e1f\u0e32\u0e07<\/h3>\n<p>Drives rotary blades to cut grass, straw, or cover crops such as cornstalks. The adjustable gear ratio controls blade speed, allowing operators to shift between coarse crushing for direct field return and fine crushing for forage feed applications. Suitable for pasture renovation, hay field preparation, and post-harvest cover crop termination across a wide range of grass densities and moisture contents.<\/p>\n<\/div>\n<div>\n<h3>\u0e01\u0e32\u0e23\u0e01\u0e33\u0e08\u0e31\u0e14\u0e1e\u0e38\u0e48\u0e21\u0e44\u0e21\u0e49\u0e41\u0e25\u0e30\u0e2b\u0e19\u0e32\u0e21<\/h3>\n<p>Delivers the high torque output needed to cut through hard woody brush, brambles, and light saplings at the edges of orchards, woodlands, and fence lines. The RC-120\u2019s robust bevel gearing and heavy housing absorb the impact energy of striking dense woody stalks repeatedly throughout the working day without gear tooth fatigue or housing fracture, making this rotary slasher gearbox the professional\u2019s choice for land clearing operations.<\/p>\n<\/div>\n<div>\n<h3>\u0e01\u0e32\u0e23\u0e40\u0e15\u0e23\u0e35\u0e22\u0e21\u0e1e\u0e37\u0e49\u0e19\u0e17\u0e35\u0e48\u0e40\u0e1e\u0e32\u0e30\u0e1b\u0e25\u0e39\u0e01\u0e41\u0e25\u0e30\u0e01\u0e32\u0e23\u0e08\u0e31\u0e14\u0e01\u0e32\u0e23\u0e15\u0e2d\u0e0b\u0e31\u0e07<\/h3>\n<p>When combined with disc knives or flail blades, the RC-120 rapidly clears field stubble from rice, wheat, and corn harvests, cutting stalks down to a length suitable for rapid decomposition or subsequent tillage incorporation. Efficient stubble management accelerates field turnaround between harvest and planting, reducing the window before the next crop cycle begins and improving conditions for no-till seeding operations.<\/p>\n<\/div>\n<div>\n<h3>\u0e01\u0e32\u0e23\u0e08\u0e31\u0e14\u0e01\u0e32\u0e23\u0e1e\u0e37\u0e49\u0e19\u0e17\u0e35\u0e48\u0e2a\u0e27\u0e19\u0e1c\u0e25\u0e44\u0e21\u0e49\u0e41\u0e25\u0e30\u0e44\u0e23\u0e48\u0e2d\u0e07\u0e38\u0e48\u0e19<\/h3>\n<p>The low-profile housing makes this finishing mower gearbox ideal for inter-row vegetation control in orchards and vineyards where implement height is restricted. Operators can mulch pruning debris, cover crops, and weed growth beneath tree canopies and between trellis rows without soil inversion, preserving the mycorrhizal soil structure that fruit and wine producers depend on for premium crop quality and consistent vine performance.<\/p>\n<\/div>\n<div>\n<h3>\u0e01\u0e32\u0e23\u0e04\u0e27\u0e1a\u0e04\u0e38\u0e21\u0e1e\u0e37\u0e0a\u0e1e\u0e23\u0e23\u0e13\u0e23\u0e34\u0e21\u0e16\u0e19\u0e19\u0e41\u0e25\u0e30\u0e40\u0e02\u0e15\u0e17\u0e32\u0e07\u0e2b\u0e25\u0e27\u0e07<\/h3>\n<p>Highway departments, utility corridors, and pipeline right-of-way maintenance programs rely on rotary cutters for sustained seasonal mowing. The RC-120\u2019s rated HP range of 51 to 161 HP covers everything from compact tractor-mounted shoulder mowers to large boom-arm carrier units used on high-speed highway mowing operations, where consistent output torque across varying grass thickness is essential for safe, efficient operation.<\/p>\n<\/div>\n<div>\n<h3>Levee, Canal Bank, and Embankment Mowing<\/h3>\n<p>Water management districts and flood control agencies require vegetation management on levee crowns and canal banks where hidden debris and uneven terrain demand a shock-resistant gearbox design. The floating cutter head compatibility of the RC-120 allows the implement to follow embankment contours without blade contact with the soil surface, keeping grass short to prevent rodent burrowing while protecting the gearbox from ground impact damage.<\/p>\n<\/div>\n<div>\n<h3>Pasture and Rangeland Renovation<\/h3>\n<p>Ranchers and livestock producers use rotary cutters with the RC-120 gearbox to knock down weed pressure and promote grass regrowth between grazing cycles. Clipping mature pasture vegetation at the right height stimulates tillering and lateral spread of desirable forage species, improving long-term pasture productivity. The gearbox\u2019s 75 HP and 100 HP rotary cutter gearbox rating range covers the most common ranch tractor sizes deployed for this work.<\/p>\n<\/div>\n<div>\n<h3>Light Forestry and Land Clearing<\/h3>\n<p>Land clearing contractors working on sapling-density sites use heavy-duty rotary cutters paired with the RC-120 to fell and chip young trees up to several inches in diameter. The gearbox\u2019s maximum torque output of 2,252 Nm provides the blade force needed to cut through dense woody material at a productive rate, with the ductile iron housing providing the structural rigidity to absorb repeated high-energy blade strikes without cracking or deforming under sustained commercial use.<\/p>\n<\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7898 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-Applications-3.webp\" alt=\"\u0e01\u0e32\u0e23\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c\u0e2a\u0e33\u0e2b\u0e23\u0e31\u0e1a\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48\" width=\"1200\" height=\"820\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-Applications-3.webp 1200w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-Applications-3-980x670.webp 980w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-Applications-3-480x328.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1200px, 100vw\" \/><\/p>\n<h2>RC-120 Rotary Cutter Gearbox Components<\/h2>\n<p>1. \u0e40\u0e23\u0e37\u0e2d\u0e19\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c<br \/>\nManufactured from high-strength ductile iron to enclose and protect all internal components. The housing absorbs shock loads generated when blades strike field debris, maintains gear oil containment under all operating angles, and provides the structural backbone to which shafts, bearings, and seals are precisely mounted. A Red Oxide primer coating protects the exterior from corrosion in wet and abrasive field conditions encountered daily in agricultural rotary cutting applications.<\/p>\n<p>2. \u0e40\u0e1f\u0e37\u0e2d\u0e07\u0e14\u0e2d\u0e01\u0e08\u0e2d\u0e01<br \/>\nThe primary power-transmission elements inside the RC-120 rotary cutter gearbox. Precision forged and machine-cut from hardened alloy steel, the bevel gears redirect PTO shaft rotation through 90 degrees to drive the blade spindle, while simultaneously adjusting the output speed and torque according to the selected gear ratio. Precision straight bevel, spiral bevel, and lapped spiral bevel configurations are all available to match the specific performance and noise requirements of the application.<\/p>\n<p>3. \u0e40\u0e1e\u0e25\u0e32\u0e2d\u0e34\u0e19\u0e1e\u0e38\u0e15<br \/>\nThe shaft that connects directly to the tractor\u2019s PTO driveline. Manufactured from carburized alloy steel for maximum torsional strength, it receives rotational power from the implement\u2019s PTO driveshaft and transfers it into the gear mesh. Standard spline configurations including 1-3\/8 inch six-spline and 1-3\/4 inch six-spline allow the RC-120 to interface with a broad range of tractor models without adaptation or additional hardware.<\/p>\n<p>4. \u0e40\u0e1e\u0e25\u0e32\u0e2a\u0e48\u0e07\u0e01\u0e33\u0e25\u0e31\u0e07<br \/>\nPositioned at the base of the housing, the output shaft delivers drive power downward to the blade spindle or cutting assembly. Manufactured from carburized alloy steel and dimensioned to handle the high torque loads and repeated impact stress generated during rotary cutting operations. Shaft extensions are available as splined, keyed, or with pin holes, and multiple shaft extension unit configurations are offered to suit different implement blade attachment designs.<\/p>\n<p>5. \u0e15\u0e25\u0e31\u0e1a\u0e25\u0e39\u0e01\u0e1b\u0e37\u0e19<br \/>\nISO tapered roller bearings support both the input and output shafts, maintaining precise gear alignment under radial and axial load conditions simultaneously. Bearing quality has a direct effect on gearbox noise level, heat generation, and overall service life. The tapered roller design used in the RC-120 is specifically chosen to handle the combined axial and radial loading environment that bevel gear drives generate during normal rotary cutter operation.<\/p>\n<p>6. \u0e0b\u0e35\u0e25\u0e01\u0e31\u0e19\u0e19\u0e49\u0e33\u0e21\u0e31\u0e19<br \/>\nHigh-quality triple-lip spring-loaded seals are fitted around all rotating shafts, creating a three-barrier system that simultaneously prevents gear oil from escaping the housing and blocks mud, water, and abrasive particles from entering and contaminating the lubrication system. Worn seals are among the most common causes of premature rotary cutter gearbox failure, making this triple-lip design a significant upgrade over single-lip alternatives. Viton seal and cartridge seal options are also available.<\/p>\n<p>7. Pressure Relief Plug and Cast Iron End Caps<br \/>\nA pressure relief plug is fitted as standard to prevent internal air pressure from rising and forcing gear oil past the shaft seals as the gearbox warms up during operation. An optional oil level indicator is also available. Precision cast iron end caps close and seal both sides of the housing, creating a fully enclosed, contamination-resistant assembly that protects bearing races and gear tooth surfaces throughout the full operating life of the unit.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7873 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/Rotary-Cutter-Gearbox-Parts-1.webp\" alt=\"\u0e0a\u0e34\u0e49\u0e19\u0e2a\u0e48\u0e27\u0e19\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c\u0e02\u0e2d\u0e07\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48\" width=\"800\" height=\"800\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/Rotary-Cutter-Gearbox-Parts-1.webp 800w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/Rotary-Cutter-Gearbox-Parts-1-480x480.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 800px, 100vw\" \/><\/p>\n<h2>How to Properly Maintain Your Rotary Mower Gearbox<\/h2>\n<p>Check and Maintain Correct Oil Level<br \/>\nBefore each use, verify the rotary cutter gearbox oil level using the sight glass or dipstick. The oil should be at the full mark when the gearbox is in its normal operating position. Running the unit below the correct rotary cutter gearbox oil level causes inadequate bearing and gear lubrication, leading to overheating and accelerated wear. Use gear oil of the grade specified in the service manual and top up with the same oil type already in the unit to prevent compatibility issues.<\/p>\n<p>Follow a Regular Oil Change Schedule<br \/>\nFor new gearboxes, perform the first oil change after approximately 25 hours of operation to flush any metallic particles generated during the break-in period. After that, change the rotary cutter gearbox oil every 100 to 200 hours of use, or at minimum once per season before storing the unit. Contaminated or degraded oil loses its viscosity protection and allows moisture to accelerate internal corrosion, so oil change intervals should never be extended beyond the recommended schedule regardless of how clean the drained oil appears.<\/p>\n<p>Inspect Seals and Gaskets Regularly<br \/>\nExamine the shaft seals and housing gaskets visually each time the gearbox is serviced, looking for oil weeping, caked-on debris indicating a slow leak, or physical cracking of the seal lips. Seal failure allows gear oil to escape and field contamination to enter, dramatically shortening bearing and gear life. Replace any seal showing signs of wear or hardening immediately. Rotary cutter gearbox repair of seal failure is far less expensive when caught early than a full internal rebuild caused by contamination damage.<\/p>\n<p>Clean the Housing After Every Use<br \/>\nRinse or brush accumulated grass, mud, and plant sap from the gearbox housing exterior and shaft seal areas after every mowing session. Vegetation and soil packed around seal areas accelerates lip wear and creates moisture traps that promote rust formation on the housing surface. Keeping the housing clean also makes it easier to spot oil leaks, cracks in the casting, or loose fasteners before they develop into costly failures requiring rotary cutter gearbox rebuild procedures.<\/p>\n<p>Check Mounting Bolts and Hardware Torque<br \/>\nThe high shock load environment of rotary cutting causes mounting hardware to loosen progressively over time. Inspect and re-torque all flange mounting bolts, blade carrier fasteners, and PTO driveshaft connection hardware at the beginning of each season and after any blade strike event severe enough to trigger the overload protection system. Loose mounting bolts allow the gearbox to move under load, introducing misalignment stresses on the input and output shafts that accelerate bearing wear.<\/p>\n<p>Store the Gearbox Correctly During Off-Season<br \/>\nBefore long-term storage, drain and replace the gear oil to remove moisture and metallic particles accumulated during the season. Coat exposed shaft ends with a light film of anti-corrosion grease and store the implement in a dry, covered location. If the gearbox is stored with the output shaft pointing vertically downward, verify that oil is at the correct fill level so the lower bearing race remains submerged. A fresh oil fill going into storage is the single most effective step to prevent internal corrosion during the off-season.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7864 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-3.webp\" alt=\"\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48\" width=\"1200\" height=\"900\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-3.webp 1200w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-3-980x735.webp 980w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/0_Rotary-Cutter-Gearbox-3-480x360.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1200px, 100vw\" \/><\/p>\n<h2>\u0e02\u0e49\u0e2d\u0e1c\u0e34\u0e14\u0e1e\u0e25\u0e32\u0e14\u0e17\u0e31\u0e48\u0e27\u0e44\u0e1b\u0e41\u0e25\u0e30\u0e27\u0e34\u0e18\u0e35\u0e41\u0e01\u0e49\u0e44\u0e02<\/h2>\n<div>\n<h3>Excessive Noise or Grinding Sound<\/h3>\n<p><strong>\u0e2a\u0e32\u0e40\u0e2b\u0e15\u0e38:<\/strong>\u00a0Worn or damaged bevel gears, incorrect gear backlash, or insufficient rotary cutter gearbox oil level.<br \/>\n<strong>\u0e2a\u0e32\u0e23\u0e25\u0e30\u0e25\u0e32\u0e22:<\/strong>\u00a0Check and correct the oil level first. If noise persists, remove the housing covers and inspect gear tooth surfaces for pitting, spalling, or chipping. Adjust gear backlash to the manufacturer\u2019s specification. Replace worn gears as part of a rotary cutter gearbox rebuild if tooth damage is confirmed on inspection.<\/p>\n<\/div>\n<div>\n<h3>Oil Leaking from Shaft Seals<\/h3>\n<p><strong>\u0e2a\u0e32\u0e40\u0e2b\u0e15\u0e38:<\/strong>\u00a0Worn or hardened shaft seal lips, over-pressurized housing due to blocked pressure relief plug, or over-filled oil level.<br \/>\n<strong>\u0e2a\u0e32\u0e23\u0e25\u0e30\u0e25\u0e32\u0e22:<\/strong>\u00a0Clean the shaft area and confirm the leak source. Clear or replace the pressure relief plug. Correct the oil level if over-filled. Replace the faulty seal with a new triple-lip seal. This is the most common rotary cutter gearbox repair task and should be addressed before the next use to prevent contamination.<\/p>\n<\/div>\n<div>\n<h3>\u0e40\u0e01\u0e34\u0e14\u0e04\u0e27\u0e32\u0e21\u0e23\u0e49\u0e2d\u0e19\u0e2a\u0e39\u0e07\u0e40\u0e01\u0e34\u0e19\u0e44\u0e1b\u0e02\u0e13\u0e30\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19<\/h3>\n<p><strong>\u0e2a\u0e32\u0e40\u0e2b\u0e15\u0e38:<\/strong>\u00a0Low oil level, wrong oil viscosity, blocked housing ventilation, or sustained overload operation.<br \/>\n<strong>\u0e2a\u0e32\u0e23\u0e25\u0e30\u0e25\u0e32\u0e22:<\/strong>\u00a0Check oil level and oil grade. Verify the pressure relief plug is functional and not blocked with debris. If the gearbox is consistently overloaded, select a lower gear ratio or reduce the cutting width. Overheating accelerates seal degradation and leads to bearing failure if left uncorrected over multiple operating sessions.<\/p>\n<\/div>\n<div>\n<h3>Shaft End Play or Vibration<\/h3>\n<p><strong>\u0e2a\u0e32\u0e40\u0e2b\u0e15\u0e38:<\/strong>\u00a0Worn tapered roller bearings, loose bearing preload adjustment, or a bent shaft from a severe blade strike.<br \/>\n<strong>\u0e2a\u0e32\u0e23\u0e25\u0e30\u0e25\u0e32\u0e22:<\/strong>\u00a0Measure shaft end play against the manufacturer\u2019s tolerance. Adjust bearing preload if within the adjustment range. Replace bearings that show pitting, discoloration, or roughness on the rolling surfaces. Inspect the shaft for straightness. Excessive vibration transmits damaging forces to the tractor PTO driveline if not corrected promptly.<\/p>\n<\/div>\n<div>\n<h3>Gearbox Loses Drive (No Blade Rotation)<\/h3>\n<p><strong>\u0e2a\u0e32\u0e40\u0e2b\u0e15\u0e38:<\/strong>\u00a0Sheared shear bolt on the overload clutch hub, or a severely worn or broken bevel gear.<br \/>\n<strong>\u0e2a\u0e32\u0e23\u0e25\u0e30\u0e25\u0e32\u0e22:<\/strong>\u00a0First check the shear bolt on the input shaft overload hub and replace it with the correct grade and diameter bolt if sheared. Do not substitute a higher-strength bolt, as this removes overload protection from the gearbox. If the shear bolt is intact, inspect internally for broken gear teeth and proceed with rotary cutter gearbox repair or full replacement as indicated.<\/p>\n<\/div>\n<div>\n<h3>Milky or Discolored Gear Oil<\/h3>\n<p><strong>\u0e2a\u0e32\u0e40\u0e2b\u0e15\u0e38:<\/strong>\u00a0Water contamination through a failed seal, housing crack, or condensation from repeated cold starts.<br \/>\n<strong>\u0e2a\u0e32\u0e23\u0e25\u0e30\u0e25\u0e32\u0e22:<\/strong>\u00a0Drain the contaminated oil completely, flush with clean gear oil, and refill with fresh oil of the correct specification. Identify and replace the failed seal or repair the housing crack before returning the gearbox to service. Water-contaminated gear oil destroys the lubricating film on gear teeth and causes rapid corrosive pitting of bearing races.<\/p>\n<\/div>\n<div>\n<h3>Cracked or Fractured Gearbox Housing<\/h3>\n<p><strong>\u0e2a\u0e32\u0e40\u0e2b\u0e15\u0e38:<\/strong>\u00a0Severe blade strike against a large embedded obstruction, or operation beyond the rated HP and torque limits.<br \/>\n<strong>\u0e2a\u0e32\u0e23\u0e25\u0e30\u0e25\u0e32\u0e22:<\/strong>\u00a0A cracked housing cannot be safely repaired by field welding without complete teardown and internal inspection. If the crack is minor and not through an oil-retaining wall, qualified cast iron welding and pressure testing may restore the housing. In most cases, replacement with a new RC-120 rotary cutter gearbox is the safest and most economical long-term solution.<\/p>\n<\/div>\n<div>\n<h3>Loose or Slipping PTO Shaft Connection<\/h3>\n<p><strong>\u0e2a\u0e32\u0e40\u0e2b\u0e15\u0e38:<\/strong>\u00a0Worn splines on the input shaft or PTO yoke, or incorrect PTO shaft length causing the yoke to slip off the spline under load.<br \/>\n<strong>\u0e2a\u0e32\u0e23\u0e25\u0e30\u0e25\u0e32\u0e22:<\/strong>\u00a0Inspect spline wear on both the gearbox input shaft and the PTO driveline yoke. Replace worn spline components. Verify the PTO shaft is the correct length for the implement-tractor combination and that the safety collar engages fully on the gearbox input shaft before applying power in the field.<\/p>\n<\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7925 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/RC-61-Rotary-Cutter-Gearbox-2.webp\" alt=\"\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c\u0e2a\u0e33\u0e2b\u0e23\u0e31\u0e1a\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48 RC-61\" width=\"1000\" height=\"1000\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/RC-61-Rotary-Cutter-Gearbox-2.webp 1000w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/RC-61-Rotary-Cutter-Gearbox-2-980x980.webp 980w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/RC-61-Rotary-Cutter-Gearbox-2-480x480.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1000px, 100vw\" \/><\/p>\n<h2>PTO Drive Shaft and Rotary Cutter Gearbox<\/h2>\n<p>The rotary cutter gearbox and PTO shaft together form the complete mechanical power pathway between the tractor\u2019s engine and the cutting blades beneath the implement deck. Understanding this relationship is essential for anyone selecting, installing, or servicing these components, whether purchasing a 40 HP rotary cutter gearbox for a compact tractor or a 100 HP rotary cutter gearbox for a large commercial mowing operation.<\/p>\n<p>The PTO shaft is a telescoping driveshaft with universal joints at each end that connects the tractor\u2019s rear PTO output flange to the gearbox input shaft. Tractor PTO standards dictate that the shaft turns at either 540 RPM (typically on tractors rated below 50 HP) or 1,000 RPM (more common on higher-horsepower tractors), with the shaft rotating in the direction specified by the tractor manufacturer. The PTO shaft is protected by a plastic safety shield that prevents contact with the rotating assembly during operation. Both the shield and the shaft itself must be properly maintained and matched to the implement\u2019s required torque capacity.<\/p>\n<p>The rotary cutter gearbox connects directly from the tractor\u2019s Power Take-Off (PTO) shaft straight down to the blade carrier bar on a vertical axis. A rotary cutter gearbox and PTO shaft transfer power from a tractor\u2019s power takeoff to spin the mower\u2019s heavy blades under the deck. The gearbox handles the high-impact shock loads when the heavy swing-away blades strike thick brush, rocks, or small trees at operating speed. These shock events generate sudden torque spikes that can be many times greater than the average operating torque, and the gearbox housing, gear tooth geometry, and bearing selection are all engineered specifically to absorb and dissipate these peaks without failure.<\/p>\n<p>PTO shaft length is critical to safe and efficient power transfer. If the shaft is too short, the telescoping sections can fully collapse under raising or lowering of the implement\u2019s three-point hitch, causing the PTO shaft to disengage or break. If too long, the shaft can bottom out in its telescoped position, preventing the hitch from raising fully. Correct shaft length is determined by measuring the compressed and extended dimensions for the specific tractor-implement combination and confirming there is adequate overlap in both positions. Most implement manufacturers specify a minimum shaft overlap of at least one-third of the compressed length.<\/p>\n<p>For optimum gearbox performance, the PTO driveshaft operating angle should be kept as small as possible during field operation. Excessive universal joint operating angles create velocity fluctuations in the driveshaft rotation that are transmitted as vibration and torque pulsation into the gearbox input shaft. These pulsations accelerate bearing wear, promote gear tooth surface fatigue, and increase noise levels. Setting up the implement so the driveshaft runs as straight as practicable between the PTO output and the gearbox input is one of the most effective and lowest-cost ways to extend gearbox service life considerably.<\/p>\n<p>Overload protection between the PTO shaft and gearbox input is provided by either a shear bolt hub mounted on the gearbox input shaft, or a slip clutch incorporated into the PTO driveshaft assembly. The shear bolt type uses a low-strength steel bolt that fractures at a defined torque, stopping power transmission instantly. The slip clutch type allows the drive to slip at a preset torque limit, providing continuous protection without requiring a bolt replacement after each event. CMN Transmission recommends always operating with an appropriate overload protection device in place and never bypassing the shear bolt by substituting a stronger grade, as doing so transfers the failure point from the sacrificial device to the gearbox internal components or the tractor\u2019s PTO shaft.<\/p>\n<p>Matching the PTO shaft torque rating to the gearbox\u2019s maximum rated torque is the final critical specification check. When selecting rotary cutter gearbox parts including a replacement PTO shaft, verify that the shaft\u2019s listed torque capacity meets or exceeds the maximum torque output of the RC-120 at the selected gear ratio. Using an undersized PTO shaft on a 60 HP rotary cutter gearbox or 75 HP rotary cutter gearbox rated application is a common cause of shaft fracture that puts both equipment and operators at risk during field operation.<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"width: 50%;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7842 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/RC-30-Rotary-Cutter-Gearbox.webp\" alt=\"\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c\u0e2a\u0e33\u0e2b\u0e23\u0e31\u0e1a\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48 RC-30\" width=\"800\" height=\"800\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/RC-30-Rotary-Cutter-Gearbox.webp 800w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/08\/RC-30-Rotary-Cutter-Gearbox-480x480.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 800px, 100vw\" \/><\/td>\n<td style=\"width: 50%;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6108 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/03\/0_PTO-Shaft-for-Bush-Hog-Rotary-Cutter-1.webp\" alt=\"\u0e40\u0e1e\u0e25\u0e32 PTO \u0e2a\u0e33\u0e2b\u0e23\u0e31\u0e1a\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e2b\u0e0d\u0e49\u0e32\u0e41\u0e1a\u0e1a\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48 Bush Hog\" width=\"800\" height=\"800\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/03\/0_PTO-Shaft-for-Bush-Hog-Rotary-Cutter-1.webp 800w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/03\/0_PTO-Shaft-for-Bush-Hog-Rotary-Cutter-1-480x480.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 800px, 100vw\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u0e40\u0e2b\u0e15\u0e38\u0e43\u0e14\u0e08\u0e36\u0e07\u0e04\u0e27\u0e23\u0e40\u0e25\u0e37\u0e2d\u0e01\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e17\u0e14\u0e23\u0e2d\u0e1a\u0e2a\u0e33\u0e2b\u0e23\u0e31\u0e1a\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48\u0e02\u0e2d\u0e07 CMN Transmission?<\/h2>\n<p>Korea CMN Transmission Co., Ltd. was established in 2000 and is headquartered in Sandan-o, Danwon-gu, Ansan-si, Gyeonggi-do, South Korea. With more than 100 factory employees dedicated to the research, development, manufacturing, sales, and after-sales service of agricultural power transmission equipment, CMN Transmission has spent over two decades building a reputation as one of the most trusted rotary cutter gearbox manufacturers in the global agricultural machinery industry. With an annual production volume exceeding 500,000 units, CMN consistently delivers reliable performance and long-term durability for OEM and aftermarket customers across every major agricultural market worldwide.<\/p>\n<p>CMN\u2019s product range covers the complete spectrum of agricultural gearbox applications: rotary cutter gearboxes, rotary tiller gearboxes, feed mixer gearboxes, rotary mower gearboxes, fertilizer spreader gearboxes, flail mower gearboxes, post hole digger gearboxes, round baler gearboxes, square baler gearboxes, disc mower gearboxes, center pivot irrigation gearboxes, hydraulic drive gearboxes, silage machine gearboxes, orchard sprayer gearboxes, rotary rake gearboxes, combine harvester gearboxes, grain storage and grain transportation gearboxes, corn header gearboxes, cutting bar gearboxes, poultry feeding gearboxes, and custom agricultural gearboxes covering nearly one thousand specifications. These products serve equipment across grain harvesting, forage machinery, mowers, balers, rakes, rotary tillers, fertilizer spreaders, sprayers, feed mixers, silage machines, and combine harvesters worldwide.<\/p>\n<p>CMN Transmission holds CE, ISO 9001 Quality Management, Environmental Management, and Occupational Health and Safety certifications, giving procurement managers and equipment dealers the compliance documentation required for regulated markets without additional testing burden. Products are exported to the United States, Canada, Mexico, Brazil, Argentina, France, Germany, Italy, Spain, the United Kingdom, Russia, China, India, Thailand, Vietnam, Turkey, Australia, New Zealand, and more than 40 additional destinations worldwide, supported by a logistics network with extensive experience navigating agricultural equipment customs classifications and phytosanitary requirements in every major export market.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7915 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/0_Rotary-Cutter-Gearbox-Manufacturers.webp\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1200px, 100vw\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/0_Rotary-Cutter-Gearbox-Manufacturers.webp 1200w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/0_Rotary-Cutter-Gearbox-Manufacturers-980x670.webp 980w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/0_Rotary-Cutter-Gearbox-Manufacturers-480x328.webp 480w\" alt=\"\u0e1c\u0e39\u0e49\u0e1c\u0e25\u0e34\u0e15\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c\u0e2a\u0e33\u0e2b\u0e23\u0e31\u0e1a\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48\" width=\"1200\" height=\"820\" \/><\/p>\n<h2>\u0e04\u0e33\u0e16\u0e32\u0e21\u0e17\u0e35\u0e48\u0e1e\u0e1a\u0e1a\u0e48\u0e2d\u0e22<\/h2>\n<p><strong>Q: What oil type and how much oil does the RC-120 rotary cutter gearbox require?<\/strong><br \/>\nA: The RC-120 has a gear oil capacity of 60 oz. (1.8 liters). Most rotary cutter gearboxes use SAE 90 or SAE 140 gear oil, though some manufacturers recommend a multi-grade gear oil such as 80W-90. Always check the gearbox manufacturer\u2019s specification and avoid mixing different oil types. Maintaining the correct rotary cutter gearbox oil level is essential to prevent overheating and premature wear. Check the oil level before each use and change the oil after the first 25 hours on a new unit, then every 100 to 200 operating hours thereafter.<\/p>\n<p><strong>Q: Is the RC-120 a direct replacement for the Omni RC-120 gearbox?<\/strong><br \/>\nA: Yes. The CMN Transmission RC-120 Rotary Cutter Gearbox is designed as a direct bolt-on replacement for the original Omni RC-120 gearbox. It matches the OEM mounting bolt pattern, flange dimensions, input shaft spline specification, and output shaft dimensions. No modification, drilling, or custom adapters are required for installation. This replacement rotary cutter gearbox meets or exceeds OEM torque and HP ratings, so your implement performs at the same level as it did with the original gearbox.<\/p>\n<p><strong>Q: What does the rotary cutter gearbox ratio mean and which ratio should I choose?<\/strong><br \/>\nA: The rotary cutter gearbox ratio describes the relationship between input shaft speed (from the tractor PTO) and output shaft speed (driving the blade). A ratio of 1:1 means the output rotates at the same speed as the input. A ratio of 1:1.92 means the output rotates 1.92 times faster than the input, giving higher blade tip speed suitable for light grass and finishing mower gearbox applications. A ratio of 1.21:1 provides a speed reduction and torque increase, preferred for heavy brush, wet vegetation, or steep terrain. Select the ratio that best matches your tractor\u2019s PTO speed and the target cutting application.<\/p>\n<p><strong>\u0e16\u0e32\u0e21: \u0e09\u0e31\u0e19\u0e08\u0e30\u0e23\u0e39\u0e49\u0e44\u0e14\u0e49\u0e2d\u0e22\u0e48\u0e32\u0e07\u0e44\u0e23\u0e27\u0e48\u0e32\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e02\u0e2d\u0e07\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48\u0e02\u0e2d\u0e07\u0e09\u0e31\u0e19\u0e08\u0e33\u0e40\u0e1b\u0e47\u0e19\u0e15\u0e49\u0e2d\u0e07\u0e0b\u0e48\u0e2d\u0e21\u0e41\u0e0b\u0e21\u0e2b\u0e23\u0e37\u0e2d\u0e40\u0e1b\u0e25\u0e35\u0e48\u0e22\u0e19\u0e43\u0e2b\u0e21\u0e48?<\/strong><br \/>\nA: Signs that a rotary cutter gearbox rebuild or replacement is needed include persistent grinding or growling noise that continues after correcting the oil level, visible gear oil leaks from shaft seal areas despite new seals, excessive output shaft end play beyond manufacturer tolerance, a bent or cracked housing, or complete loss of drive after replacing the shear bolt. If the internal gears show pitting, spalling, or chipped teeth on inspection, a full rotary cutter gearbox rebuild is required. In many cases, when the housing is cracked or heavily worn, purchasing a replacement RC-120 gearbox from CMN Transmission is more economical than a full internal rebuild.<\/p>\n<p><strong>Q: Can I use this gearbox on a 40 HP, 60 HP, 75 HP, or 100 HP tractor?<\/strong><br \/>\nA: The RC-120 is rated for 51 to 161 HP, so it is appropriate for 60 HP, 75 HP, and 100 HP rotary cutter gearbox applications within that range. It is above the rated range for a 40 HP rotary cutter gearbox application, where a smaller RC-series model would be more suitable. Operating a gearbox below its rated HP does not cause damage, but selecting the correct HP rating ensures the gear tooth size, bearing capacity, and housing strength are properly matched to the load being transmitted. Contact CMN Transmission to confirm the correct model for your specific tractor HP and implement type before ordering.<\/p>\n<p><strong>Q: What causes rotary cutter gearbox oil leaks and how do I fix them?<\/strong><br \/>\nA: Rotary cutter gearbox oil leaks most commonly originate from worn or hardened shaft oil seals, a blocked pressure relief plug causing internal overpressure, an over-filled oil level, or hairline cracks in the housing. To fix a shaft seal leak: drain the oil, remove the seal, clean the shaft and bore, press in a new triple-lip seal, refill to the correct oil level, and check that the pressure relief plug moves freely. For a cracked housing, consult a casting repair specialist or replace the gearbox. Always correct a seal leak before the next use to prevent contamination from entering and causing accelerated internal wear.<\/p>\n<p><strong>Q: What rotary cutter gearbox parts are available for the RC-120?<\/strong><br \/>\nA: CMN Transmission offers a range of rotary cutter gearbox parts for the RC-120, including replacement seal kits (triple-lip shaft seals), tapered roller bearing sets, bevel gear pairs, input and output shaft assemblies, pressure relief plugs, and end cap gaskets. Blade hub kits and seal protector hubs are also available as optional accessories. When ordering replacement parts, always specify the model number and ratio of your gearbox to ensure compatibility. Keeping a basic seal kit and bearing set on hand reduces downtime when scheduled maintenance reveals worn components during the operating season.<\/p>\n<p><strong>Q: How long does delivery take and does CMN ship internationally?<\/strong><br \/>\nA: CMN Transmission ships the RC-120 Rotary Cutter Gearbox to over 60 countries worldwide from its manufacturing facility in Ansan, South Korea. Delivery times vary by destination: express air freight typically delivers within 7 to 14 business days to major markets including the United States, Canada, the United Kingdom, Germany, France, Australia, and Brazil. Sea freight options are available for bulk orders at lower per-unit cost with longer lead times. CMN handles all export documentation, and units are supplied with CE certification. Contact the sales team for a freight quotation to your specific location and to confirm current stock availability.<\/p>\n<p><strong>Q: What is the difference between a rotary mower gearbox and a rotary cutter gearbox?<\/strong><br \/>\nA: The terms rotary mower gearbox and rotary cutter gearbox are often used interchangeably in the agricultural industry, as both describe a bevel gear power transmission unit that drives rotating cutting blades on a PTO-powered tractor implement. The distinction, when it exists, is typically one of application weight: a rotary mower gearbox often refers to a unit used on lighter finishing mowers for turf and pasture maintenance, while a rotary cutter gearbox or rotary slasher gearbox implies a heavier-duty unit designed for brush clearing, roadside slashing, and rougher cutting conditions. The RC-120 covers both categories with its 51 to 161 HP rating and five available gear ratios.<\/p>\n<p><strong>Q: How do I find the correct rotary cutter gearbox for sale that fits my implement?<\/strong><br \/>\nA: To identify the correct rotary cutter gearbox for your implement, you need: (1) the mounting flange bolt hole pattern diameter and number of bolts, (2) the hub pilot diameter, (3) the input shaft spline count and diameter (typically 1-3\/8 inch or 1-3\/4 inch 6-spline for agricultural PTO applications), (4) the output shaft dimensions and attachment interface, and (5) the HP or torque rating required by your implement. If your implement is an Omni RC-120 or equivalent, the CMN RC-120 is the confirmed direct replacement. For other models, share your implement make, model, and the dimensions listed above with the CMN technical team, who can confirm compatibility before you complete your order.<\/p>\n<p><strong>Q: Can I use synthetic gear oil in my rotary cutter gearbox?<\/strong><br \/>\nA: Yes, synthetic gear oil can be used in the RC-120 if it meets the API GL-4 or GL-5 specification and the viscosity grade recommended for your operating temperature range. Synthetic oils generally provide better thermal stability at high operating temperatures, improved low-temperature flow for cold-start conditions, and longer drain intervals than conventional mineral gear oils. However, never mix synthetic and mineral gear oils in the same gearbox. If switching from mineral to synthetic, drain the old oil completely and flush with a small quantity of the new synthetic before filling to the full mark. Check the rotary cutter gearbox oil level after the first few hours of operation on the new fill to confirm correct level.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7961 size-full\" src=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/RC-120-Rotary-Cutter-Gearbox-2.webp\" alt=\"\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e1a\u0e47\u0e2d\u0e01\u0e0b\u0e4c\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48 RC-120\" width=\"1000\" height=\"1000\" srcset=\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/RC-120-Rotary-Cutter-Gearbox-2.webp 1000w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/RC-120-Rotary-Cutter-Gearbox-2-980x980.webp 980w, https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/09\/RC-120-Rotary-Cutter-Gearbox-2-480x480.webp 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1000px, 100vw\" \/><\/p>\n<h2>\u0e23\u0e35\u0e27\u0e34\u0e27\u0e08\u0e32\u0e01\u0e25\u0e39\u0e01\u0e04\u0e49\u0e32<\/h2>\n<p><strong>Travis Holloway, Pasture Management, United States<\/strong><br \/>\n\u201cI run a 90 HP John Deere on about 200 acres of mixed pasture and creek-bank country, and the original gearbox on my Rhino cutter gave out after three seasons of hard use. Found this RC-120 replacement through CMN and honestly wasn\u2019t sure what to expect from an aftermarket unit at this price point. Well, I installed it in about an hour using the same bolt pattern, no drilling, no adapters, nothing. Been running it hard for six months now through thick Bermuda grass and some brushy creek edges, and not one issue. Oil is clean, no leaks, no weird noise. Genuinely impressed. Will order again when the time comes.\u201d<\/p>\n<p><strong>Derek Fontaine, Vegetation Management, Canada<\/strong><br \/>\n\u201cWe operate a roadside mowing contract in Ontario and go through gearboxes faster than most. Tried the RC-120 from CMN about a year ago after a recommendation from another contractor. Two of our units have been running the CMN replacement now for about 350 hours each. Seals are still tight, no oil loss, and both are running at the 1:1.46 ratio which suits our 100 HP Kubota perfectly for mixed grass and light brush along the highway shoulders. The packaging from Korea was also very well done; no damage in shipping which has been a problem with other suppliers. Service was quick to respond when I had a question about the ratio selection. Really solid product and supplier.\u201d<\/p>\n<p><strong>Rodrigo Alves Ferreira, Sugar Cane Operations, Brazil<\/strong><br \/>\n\u201cBought this for my sugar cane operation in Sao Paulo state. We use it on a 75 HP tractor to mulch cane trash after harvest and it handles the load well. The 1:1.21 ratio gives us the torque we need without bogging the tractor down. Shipping to Brazil took about 3 weeks which is normal for imported goods here, and customs was no problem. The only reason I didn\u2019t give five stars is I had to source the gear oil locally since it wasn\u2019t included, which is normal but worth mentioning. Everything else about this purchase was great and I would buy again without hesitation. CMN\u2019s team answered my pre-sale questions about shaft dimensions very clearly and quickly.\u201d<\/p>\n<p><strong>Klaus-Dieter Brandt, Farm Machinery, Germany<\/strong><br \/>\n\u201cWe use the RC-120 on our flail mower with a 120 HP tractor, primarily for mulching field margins and hedge undergrowth. Quality-wise, the gearbox makes a very solid impression; the nodular cast iron housing is well manufactured and the seals fit perfectly. No oil leaks after the first season, no noises, nothing. I initially had concerns because of the Korean manufacturer, but CMN clearly exceeded expectations. Communication in English was straightforward, and delivery to Germany took 12 working days via DHL Express. Highly recommended for anyone looking for a solid replacement gearbox.\u201d<\/p>\n<p><strong>Brendan Carrick, Pasture Maintenance, Australia<\/strong><br \/>\n\u201cI manage about 400 hectares of sheep country in New South Wales and the pasture maintenance never stops. My original gearbox on a McConnel slasher packed it in mid-season right when I needed it most. CMN had the RC-120 available immediately and their support team confirmed the specs matched my unit before I ordered. It arrived in 10 business days, which was faster than I expected for a delivery to regional NSW. Fitting took less than an hour. That was 8 months ago and I\u2019ve probably done 180 operating hours since then in everything from dry kikuyu to wet rye. Gear engagement is smooth, no play in the output shaft, and the seals are holding up perfectly in dusty paddock conditions.\u201d<\/p>\n<p><strong>Hernan Gomez Vargas, Sugar Cane Farm, Colombia<\/strong><br \/>\n\u201cI bought the RC-120 to replace the original gearbox on my rotary cutter that we use on the sugar cane farm in Tolima. We have been running it at full capacity for 4 months and have had zero problems so far. We installed it ourselves following the instructions that CMN sent us by email. I really liked that the sales team answered my questions via email quickly and confirmed that the model was compatible with my machine before I placed the order. Shipping took 3 weeks to Colombia, which is fine. The price is very competitive for the quality it offers. I have already recommended the product to other farmers in the region.\u201d<\/p>\n<p><strong>Simon Partridge, Roads Maintenance, United Kingdom<\/strong><br \/>\n\u201cI work for a local government roads authority in Lincolnshire and we maintain about 600 km of rural verge every year. We\u2019ve standardised on the RC-120 from CMN for our fleet of tractor-mounted cutters over the past two years. Out of the 11 units we\u2019ve purchased so far, not one has needed a warranty call. The quality consistency between batches is something we specifically tested for before committing to this supplier at scale, and CMN passed. Their export documentation and CE compliance paperwork was also complete and correct on the first request, which matters enormously for our procurement process. For any local authority or contractor looking for reliable rotary cutter gearbox suppliers, I\u2019d point them to CMN without hesitation.\u201d<\/p>\n<p><strong>Manuel Diaz Moreno, Sunflower and Cereal Stubble, Spain<\/strong><br \/>\n\u201cI have been working with rotary cutters in Andalusia for many years, and I have always looked for quality parts at a reasonable price. The RC-120 from CMN Transmission is exactly that. We mounted it on a 90-horsepower cutter to clear sunflower and cereal stubble after the harvest. The 1:1.92 ratio is perfect for us for that job. The finish of the body is good, the seals are well-adjusted from the factory, and it has not leaked any oil in the first 120 hours of use. CMN\u2019s technical service resolved a question we had about the correct oil level in less than 2 hours by email. Very satisfied with the purchase and with the treatment received from the sales team.\u201d<\/p>\n<p><strong>Suresh Patel, Cutting Paddy and Wheat Stalk, India<\/strong><br \/>\n\u201c\u0e43\u0e19\u0e1f\u0e32\u0e23\u0e4c\u0e21\u0e02\u0e2d\u0e07\u0e40\u0e23\u0e32 \u0e40\u0e23\u0e32\u0e43\u0e0a\u0e49\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c RC-120 \u0e19\u0e35\u0e49\u0e01\u0e31\u0e1a\u0e40\u0e04\u0e23\u0e37\u0e48\u0e2d\u0e07\u0e15\u0e31\u0e14\u0e2b\u0e0d\u0e49\u0e32\u0e41\u0e1a\u0e1a\u0e42\u0e23\u0e15\u0e32\u0e23\u0e35\u0e48\u0e17\u0e35\u0e48\u0e43\u0e0a\u0e49\u0e01\u0e31\u0e1a\u0e23\u0e16\u0e41\u0e17\u0e23\u0e01\u0e40\u0e15\u0e2d\u0e23\u0e4c 60 \u0e41\u0e23\u0e07\u0e21\u0e49\u0e32 \u0e0b\u0e36\u0e48\u0e07\u0e43\u0e0a\u0e49\u0e2a\u0e33\u0e2b\u0e23\u0e31\u0e1a\u0e15\u0e31\u0e14\u0e15\u0e49\u0e19\u0e02\u0e49\u0e32\u0e27\u0e41\u0e25\u0e30\u0e2b\u0e0d\u0e49\u0e32 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