{"id":7960,"date":"2026-09-07T06:47:09","date_gmt":"2026-09-07T06:47:09","guid":{"rendered":"https:\/\/korea-transmission.com\/?post_type=product&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\/es\/producto\/rc-120-rotary-cutter-gearbox-replacement-for-omni-rc-120-gearbox\/","title":{"rendered":"Caja de engranajes de repuesto para cortadora rotativa RC-120 Omni RC-120"},"content":{"rendered":"

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

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

\"Caja<\/p>\n

Especificaciones del producto<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Modelo:<\/td>\nCaja de cambios RC-120<\/td>\n<\/tr>\n
Clasificaci\u00f3n HP<\/td>\n51 \u2013 161 HP<\/td>\n<\/tr>\n
Esfuerzo de torsi\u00f3n:<\/td>\n7.117 \u2013 19.950 libras-pulg.
\n(803 \u2013 2.252 Nm.)<\/td>\n<\/tr>\n
Proporciones:<\/td>\n1.21:1, 1:1, 1:1.21, 1:1.46, 1:1.92<\/td>\n<\/tr>\n
Tipo de engranaje:<\/td>\nBisel<\/td>\n<\/tr>\n
Tipo de sello:<\/td>\nTriple labio con resorte<\/td>\n<\/tr>\n
Tipo de rodamiento:<\/td>\nRodillo c\u00f3nico<\/td>\n<\/tr>\n
Capacidad de petr\u00f3leo:<\/td>\n60 onzas.
\n(1,8 L)<\/td>\n<\/tr>\n
Peso:<\/td>\n109 libras.
\n(49,9 kg)<\/td>\n<\/tr>\n
Aplicaciones:<\/td>\nCortadoras de acabado
\nCortadoras rotativas
\nDesbrozadoras rotativas<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

RC-120 Rotary Cutter Gearbox Dimensions<\/h2>\n

\"Dimensiones<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Modelo<\/th>\nPeso m\u00e1ximo de la unidad<\/th>\nCL a trav\u00e9s del Cap A<\/th>\nCL a la brida B<\/th>\nBrida a piloto de cubo C<\/th>\nDi\u00e1metro del piloto del cubo H<\/th>\nDi\u00e1metro de la brida D1<\/th>\nPatr\u00f3n de orificios para pernos E1<\/th>\nOrificios de montaje F1<\/th>\nBrida cuadrada de tama\u00f1o D2<\/th>\nPatr\u00f3n de orificios para pernos E2<\/th>\nOrificios de montaje F2<\/th>\n<\/tr>\n
libra<\/th>\nkg<\/th>\nen<\/th>\nmm<\/th>\nen<\/th>\nmm<\/th>\nen<\/th>\nmm<\/th>\nen<\/th>\nmm<\/th>\nen<\/th>\nmm<\/th>\nen<\/th>\nmm<\/th>\nen<\/th>\nmm<\/th>\nen<\/th>\nmm<\/th>\nen<\/th>\nmm<\/th>\nen<\/th>\nmm<\/th>\n<\/tr>\n<\/thead>\n
RC-20<\/td>\n34<\/td>\n15<\/td>\n3.0<\/td>\n76<\/td>\n6.5<\/td>\n165<\/td>\n2.40<\/td>\n61.0<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n6.18<\/td>\n157<\/td>\n6.8<\/td>\n171.5<\/td>\n(4) 0.67<\/td>\n(4) 17<\/td>\n<\/tr>\n
RC-27<\/td>\n47<\/td>\n21<\/td>\n3.5<\/td>\n88<\/td>\n6.4<\/td>\n164<\/td>\n2.40<\/td>\n61.0<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n6.18<\/td>\n157<\/td>\n6.8<\/td>\n171.5<\/td>\n(4) 0.67<\/td>\n(4) 17<\/td>\n<\/tr>\n
RC-30<\/td>\n51<\/td>\n23<\/td>\n3.9<\/td>\n100<\/td>\n6.4<\/td>\n164<\/td>\n3.30<\/td>\n84.0<\/td>\n2.5<\/td>\n63.5<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n6.89<\/td>\n175<\/td>\n6.8<\/td>\n171.5<\/td>\n(4) 0.67<\/td>\n(4) 17<\/td>\n<\/tr>\n
RC-51<\/td>\n56<\/td>\n25<\/td>\n3.7<\/td>\n94<\/td>\n6.4<\/td>\n164<\/td>\n3.50<\/td>\n88.9<\/td>\n2.5<\/td>\n63.5<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n6.89<\/td>\n175<\/td>\n6.8<\/td>\n171.5<\/td>\n(4) 0.67<\/td>\n(4) 17<\/td>\n<\/tr>\n
RC-61<\/td>\n81<\/td>\n37<\/td>\n4.2<\/td>\n107<\/td>\n7.2<\/td>\n183<\/td>\n3.50<\/td>\n88.9<\/td>\n2.5<\/td>\n63.5<\/td>\n9.5<\/td>\n242.0<\/td>\n8.0<\/td>\n203.2<\/td>\n(4) 0.787<\/td>\n(4) 20<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
RC-71<\/td>\n83<\/td>\n38<\/td>\n4.2<\/td>\n107<\/td>\n7.2<\/td>\n183<\/td>\n3.50<\/td>\n88.9<\/td>\n2.5<\/td>\n63.5<\/td>\n9.5<\/td>\n242.0<\/td>\n8.0<\/td>\n203.2<\/td>\n(4) 0.787<\/td>\n(4) 20<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
RC-81<\/td>\n98<\/td>\n45<\/td>\n4.6<\/td>\n116<\/td>\n11.0<\/td>\n279<\/td>\n3.50<\/td>\n88.9<\/td>\n2.5<\/td>\n63.5<\/td>\n9.6<\/td>\n245.0<\/td>\n8.0<\/td>\n203.2<\/td>\n(4) 0.787<\/td>\n(4) 20<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
RC-100<\/td>\n96<\/td>\n44<\/td>\n4.8<\/td>\n121<\/td>\n7.1<\/td>\n180<\/td>\n3.78<\/td>\n96.0<\/td>\n2.5<\/td>\n63.5<\/td>\n9.4<\/td>\n240.0<\/td>\n8.0<\/td>\n203.2<\/td>\n(4) 0.787<\/td>\n(4) 20<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
RC-130S<\/td>\n109<\/td>\n49<\/td>\n5.1<\/td>\n130<\/td>\n7.1<\/td>\n180<\/td>\n4.00<\/td>\n102.0<\/td>\n2.9<\/td>\n73.0<\/td>\n9.8<\/td>\n250.0<\/td>\n8.0<\/td>\n203.2<\/td>\n(6) 0.807<\/td>\n(6) 21<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
RC-130L<\/td>\n120<\/td>\n54<\/td>\n5.1<\/td>\n130<\/td>\n7.1<\/td>\n180<\/td>\n7.20<\/td>\n184.0<\/td>\n3.8<\/td>\n96.0<\/td>\n9.8<\/td>\n250.0<\/td>\n8.0<\/td>\n203.2<\/td>\n(6) 0.807<\/td>\n(6) 21<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
RC-145<\/td>\n110<\/td>\n50<\/td>\n5.6<\/td>\n142<\/td>\n8.9<\/td>\n225<\/td>\n8.05<\/td>\n204.5<\/td>\n3.8<\/td>\n96.0<\/td>\n10.2<\/td>\n260.0<\/td>\n8.0<\/td>\n203.2<\/td>\n(6) 0.807<\/td>\n(6) 21<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
RC-150L<\/td>\n145<\/td>\n66<\/td>\n5.1<\/td>\n130<\/td>\n11.0<\/td>\n280<\/td>\n7.20<\/td>\n184.0<\/td>\n3.8<\/td>\n96.0<\/td>\n9.8<\/td>\n250.0<\/td>\n8.0<\/td>\n203.2<\/td>\n(6) 0.807<\/td>\n(6) 21<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
RC-200<\/td>\n220<\/td>\n100<\/td>\n6.4<\/td>\n162<\/td>\n9.5<\/td>\n241<\/td>\n8.00<\/td>\n203.0<\/td>\n5.3<\/td>\n135.0<\/td>\n11.8<\/td>\n300.0<\/td>\n10<\/td>\n254.0<\/td>\n(6) 0.905<\/td>\n(6) 23<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Key Features of the RC-120 Rotary Cutter Gearbox<\/h2>\n

1. Terrain Adaptability and Floating Design
\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

2. Accessible Field Maintenance Design
\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

3. Tractor PTO Drive Compatibility
\nLa RC-120 se conecta directamente al eje de toma de fuerza (TDF) del tractor y admite velocidades de entrada est\u00e1ndar de 540 RPM y 1000 RPM. El eje de entrada estriado admite acoplamientos de cambio r\u00e1pido, lo que permite una instalaci\u00f3n y extracci\u00f3n r\u00e1pidas en el campo sin necesidad de herramientas especiales. Esta amplia compatibilidad con la TDF permite que la caja de engranajes se acople a tractores utilitarios compactos, tractores de gama media para cultivos en hilera y maquinaria agr\u00edcola 4x4 de gran tama\u00f1o sin necesidad de ejes adaptadores ni modificaciones personalizadas.<\/p>\n

4. Industrial-Grade Durability and Sealing
\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

5. Multiple Speed Ratios for Any Crop or Terrain
\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

6. Protecci\u00f3n de seguridad contra sobrecargas
\nEl RC-120 est\u00e1 dise\u00f1ado para aceptar sistemas opcionales de protecci\u00f3n contra sobrecarga mediante embrague de rueda libre o perno de seguridad en el eje de entrada. Cuando las cuchillas de corte chocan contra una obstrucci\u00f3n inamovible a m\u00e1xima velocidad, el dispositivo de protecci\u00f3n contra sobrecarga se desacopla o se rompe antes de que se transmita un par catastr\u00f3fico a trav\u00e9s del conjunto de engranajes c\u00f3nicos, protegiendo as\u00ed tanto los componentes internos de la caja de cambios como la transmisi\u00f3n de la toma de fuerza del tractor contra roturas. Este mecanismo de seguridad integrado es especialmente importante al operar en \u00e1reas con escombros enterrados, tocones de \u00e1rboles ocultos o afloramientos rocosos donde no se pueden prever bloqueos repentinos de las cuchillas.<\/p>\n

\"Caja<\/p>\n

Principio de funcionamiento<\/h2>\n

La caja de engranajes para cortadoras rotativas RC-120 es el elemento central de transmisi\u00f3n de potencia en cualquier cortadora rotativa, segadora de acabado o desbrozadora rotativa. Su principio de funcionamiento se basa en el eje de toma de fuerza del tractor, que transmite energ\u00eda rotacional a 540 o 1000 RPM, seg\u00fan el est\u00e1ndar de la toma de fuerza y \u200b\u200bla velocidad seleccionada. Esta entrada rotacional horizontal llega a la caja de engranajes a trav\u00e9s del eje de entrada de acero aleado endurecido, que est\u00e1 soportado en ambos extremos por rodamientos de rodillos c\u00f3nicos de precisi\u00f3n que gestionan tanto las cargas radiales derivadas de las fuerzas de engranaje como las cargas axiales generadas durante los cambios de direcci\u00f3n y las fluctuaciones de carga.<\/p>\n

Dentro de la carcasa de hierro d\u00factil, el eje de entrada acciona el engranaje c\u00f3nico primario. El conjunto de engranajes c\u00f3nicos es fundamental para el funcionamiento de la caja de engranajes agr\u00edcola, ya que redirige la entrada de la toma de fuerza horizontal en un \u00e1ngulo exacto de 90 grados, ajustando simult\u00e1neamente la relaci\u00f3n de velocidad y par entre la entrada y la salida. En relaciones de alta velocidad, como 1:1,92, el eje de salida gira significativamente m\u00e1s r\u00e1pido que el de entrada, lo que produce la alta velocidad de la punta de la cuchilla necesaria para un corte limpio del c\u00e9sped en una caja de engranajes de segadora de acabado. En relaciones de reducci\u00f3n, como 1,21:1, los engranajes c\u00f3nicos aumentan el par de salida en relaci\u00f3n con el par de entrada, lo que proporciona a la caja de engranajes de la desbrozadora rotativa la ventaja mec\u00e1nica necesaria para atravesar maleza espesa, tallos le\u00f1osos y vegetaci\u00f3n h\u00fameda densa sin detenerse.<\/p>\n

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

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 caja de engranajes de cortadora rotativa<\/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

La configuraci\u00f3n de velocidad variable del RC-120 tambi\u00e9n favorece la adaptabilidad al terreno, ya que permite a los operadores seleccionar una relaci\u00f3n de transmisi\u00f3n de la cortadora rotativa adecuada a las condiciones espec\u00edficas del terreno: las pendientes pronunciadas y los humedales se benefician de relaciones de par m\u00e1s altas, mientras que los campos planos y acondicionados se benefician m\u00e1s de relaciones de velocidad de la cuchilla m\u00e1s r\u00e1pidas que producen un corte m\u00e1s fino.<\/p>\n

\"Caja<\/p>\n

Applications of the RC-120 Gearbox<\/h2>\n
\n

Corte de c\u00e9sped y trituraci\u00f3n de paja<\/h3>\n

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

\n

Despeje de arbustos y zarzas<\/h3>\n

Ofrece el alto par motor necesario para cortar maleza le\u00f1osa, zarzas y \u00e1rboles j\u00f3venes en los bordes de huertos, bosques y cercas. El robusto engranaje c\u00f3nico y la resistente carcasa del RC-120 absorben la energ\u00eda del impacto al golpear repetidamente tallos le\u00f1osos densos durante toda la jornada laboral sin que se produzca fatiga en los dientes del engranaje ni rotura de la carcasa, lo que convierte a esta desbrozadora rotativa en la opci\u00f3n preferida de los profesionales para las operaciones de desbroce.<\/p>\n<\/div>\n

\n

Preparaci\u00f3n de terrenos agr\u00edcolas y tratamiento de rastrojos<\/h3>\n

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

\n

Gesti\u00f3n de huertos y vi\u00f1edos<\/h3>\n

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

\n

Control de la vegetaci\u00f3n en los m\u00e1rgenes de las carreteras y en las franjas de derecho de v\u00eda<\/h3>\n

Los departamentos de carreteras, los corredores de servicios p\u00fablicos y los programas de mantenimiento de servidumbres de oleoductos dependen de cortadoras rotativas para el corte estacional continuo. La potencia nominal de la RC-120, que oscila entre 51 y 161 CV, abarca desde cortadoras compactas montadas en tractor hasta grandes unidades con brazo articulado utilizadas en operaciones de corte de alta velocidad en carreteras, donde un par motor constante en diferentes grosores de c\u00e9sped es esencial para un funcionamiento seguro y eficiente.<\/p>\n<\/div>\n

\n

Levee, Canal Bank, and Embankment Mowing<\/h3>\n

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

\n

Pasture and Rangeland Renovation<\/h3>\n

Los ganaderos y productores de ganado utilizan segadoras rotativas con la caja de engranajes RC-120 para reducir la presencia de malezas y favorecer el rebrote del pasto entre los ciclos de pastoreo. El corte de la vegetaci\u00f3n madura a la altura adecuada estimula el ahijamiento y la propagaci\u00f3n lateral de especies forrajeras deseables, mejorando la productividad del pasto a largo plazo. La gama de potencias de 75 HP y 100 HP de la caja de engranajes cubre los tama\u00f1os de tractores m\u00e1s comunes utilizados para esta tarea.<\/p>\n<\/div>\n

\n

Light Forestry and Land Clearing<\/h3>\n

Los contratistas de desmonte que trabajan en terrenos con alta densidad de \u00e1rboles j\u00f3venes utilizan cortadoras rotativas de alta resistencia, combinadas con la RC-120, para talar y triturar \u00e1rboles j\u00f3venes de hasta varios cent\u00edmetros de di\u00e1metro. El par m\u00e1ximo de salida de la caja de engranajes, de 2252 Nm, proporciona la fuerza de corte necesaria para atravesar material le\u00f1oso denso a un ritmo productivo, mientras que la carcasa de hierro d\u00factil ofrece la rigidez estructural para absorber repetidos impactos de alta energ\u00eda de la cuchilla sin agrietarse ni deformarse durante un uso comercial continuo.<\/p>\n<\/div>\n

\"Aplicaciones<\/p>\n

RC-120 Rotary Cutter Gearbox Components<\/h2>\n

1. Carcasa de la caja de cambios
\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

2. Engranajes c\u00f3nicos
\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

3. Eje de entrada
\nEl eje que se conecta directamente a la toma de fuerza del tractor. Fabricado en acero aleado carburizado para una m\u00e1xima resistencia a la torsi\u00f3n, recibe la potencia de rotaci\u00f3n del eje de la toma de fuerza del implemento y la transfiere al engranaje. Las configuraciones de estr\u00edas est\u00e1ndar, que incluyen seis estr\u00edas de 1-3\/8 pulgadas y seis estr\u00edas de 1-3\/4 pulgadas, permiten que el RC-120 se acople a una amplia gama de modelos de tractores sin necesidad de adaptaciones ni componentes adicionales.<\/p>\n

4. Eje de salida
\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

5. Rodamientos
\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

6. Retenes de aceite
\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

7. Pressure Relief Plug and Cast Iron End Caps
\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

\"Piezas<\/p>\n

How to Properly Maintain Your Rotary Mower Gearbox<\/h2>\n

Check and Maintain Correct Oil Level
\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

Follow a Regular Oil Change Schedule
\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

Inspect Seals and Gaskets Regularly
\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

Clean the Housing After Every Use
\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

Check Mounting Bolts and Hardware Torque
\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

Store the Gearbox Correctly During Off-Season
\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

\"Caja<\/p>\n

Common Faults and Solutions<\/h2>\n
\n

Excessive Noise or Grinding Sound<\/h3>\n

Cause:<\/strong>\u00a0Worn or damaged bevel gears, incorrect gear backlash, or insufficient rotary cutter gearbox oil level.
\nSolution:<\/strong>\u00a0Primero, compruebe y ajuste el nivel de aceite. Si el ruido persiste, retire las tapas de la carcasa e inspeccione las superficies de los dientes de los engranajes para detectar picaduras, descamaci\u00f3n o astillamiento. Ajuste la holgura de los engranajes seg\u00fan las especificaciones del fabricante. Si se confirman da\u00f1os en los dientes durante la inspecci\u00f3n, reemplace los engranajes desgastados como parte de la reconstrucci\u00f3n de la caja de engranajes de la cortadora rotativa.<\/p>\n<\/div>\n

\n

Oil Leaking from Shaft Seals<\/h3>\n

Cause:<\/strong>\u00a0Worn or hardened shaft seal lips, over-pressurized housing due to blocked pressure relief plug, or over-filled oil level.
\nSolution:<\/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

\n

Sobrecalentamiento durante el funcionamiento<\/h3>\n

Cause:<\/strong>\u00a0Low oil level, wrong oil viscosity, blocked housing ventilation, or sustained overload operation.
\nSolution:<\/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

\n

Shaft End Play or Vibration<\/h3>\n

Cause:<\/strong>\u00a0Worn tapered roller bearings, loose bearing preload adjustment, or a bent shaft from a severe blade strike.
\nSolution:<\/strong>\u00a0Mida la holgura axial del eje y comp\u00e1rela con la tolerancia del fabricante. Ajuste la precarga del rodamiento si est\u00e1 dentro del rango de ajuste. Reemplace los rodamientos que presenten picaduras, decoloraci\u00f3n o rugosidad en las superficies de rodadura. Inspeccione el eje para verificar su rectitud. Si no se corrige de inmediato, la vibraci\u00f3n excesiva transmite fuerzas da\u00f1inas a la transmisi\u00f3n de la toma de fuerza del tractor.<\/p>\n<\/div>\n

\n

Gearbox Loses Drive (No Blade Rotation)<\/h3>\n

Cause:<\/strong>\u00a0Sheared shear bolt on the overload clutch hub, or a severely worn or broken bevel gear.
\nSolution:<\/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

\n

Milky or Discolored Gear Oil<\/h3>\n

Cause:<\/strong>\u00a0Water contamination through a failed seal, housing crack, or condensation from repeated cold starts.
\nSolution:<\/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

\n

Cracked or Fractured Gearbox Housing<\/h3>\n

Cause:<\/strong>\u00a0Severe blade strike against a large embedded obstruction, or operation beyond the rated HP and torque limits.
\nSolution:<\/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

\n

Loose or Slipping PTO Shaft Connection<\/h3>\n

Cause:<\/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.
\nSolution:<\/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

\"Caja<\/p>\n

PTO Drive Shaft and Rotary Cutter Gearbox<\/h2>\n

La caja de engranajes de la cortadora rotativa y el eje de la toma de fuerza (TDF) conforman la transmisi\u00f3n mec\u00e1nica completa entre el motor del tractor y las cuchillas de corte ubicadas debajo de la plataforma de corte. Comprender esta relaci\u00f3n es fundamental para cualquier persona que seleccione, instale o realice el mantenimiento de estos componentes, ya sea que adquiera una caja de engranajes de 40 HP para una cortadora rotativa de tractor compacto o una de 100 HP para una gran operaci\u00f3n comercial de corte de c\u00e9sped.<\/p>\n

El eje de la toma de fuerza (TDF) es un eje de transmisi\u00f3n telesc\u00f3pico con juntas universales en ambos extremos que conecta la brida de salida de la TDF trasera del tractor con el eje de entrada de la caja de cambios. Las normas para la TDF de los tractores establecen que el eje debe girar a 540 RPM (normalmente en tractores de menos de 50 CV) o a 1000 RPM (m\u00e1s com\u00fan en tractores de mayor potencia), con rotaci\u00f3n en la direcci\u00f3n especificada por el fabricante. El eje de la TDF est\u00e1 protegido por una cubierta de seguridad de pl\u00e1stico que impide el contacto con el conjunto giratorio durante el funcionamiento. Tanto la cubierta como el propio eje deben recibir el mantenimiento adecuado y ajustarse al par motor requerido por el implemento.<\/p>\n

La caja de engranajes de la segadora rotativa se conecta directamente desde el eje de la toma de fuerza (TDF) del tractor hasta la barra portacuchillas en un eje vertical. La caja de engranajes y el eje de la TDF transfieren la potencia de la toma de fuerza del tractor para hacer girar las pesadas cuchillas de la segadora bajo la plataforma. La caja de engranajes soporta las cargas de impacto elevadas que se producen cuando las pesadas cuchillas basculantes golpean maleza densa, rocas o \u00e1rboles peque\u00f1os a velocidad de funcionamiento. Estos impactos generan picos de par repentinos que pueden ser muchas veces superiores al par de funcionamiento promedio, y la carcasa de la caja de engranajes, la geometr\u00eda de los dientes de los engranajes y la selecci\u00f3n de los rodamientos est\u00e1n dise\u00f1ados espec\u00edficamente para absorber y disipar estos picos sin fallar.<\/p>\n

La longitud del eje de la toma de fuerza (TDF) es fundamental para una transmisi\u00f3n de potencia segura y eficiente. Si el eje es demasiado corto, las secciones telesc\u00f3picas pueden colapsar por completo al subir o bajar el enganche de tres puntos del implemento, lo que provoca que el eje de la TDF se desacople o se rompa. Si es demasiado largo, el eje puede tocar fondo en su posici\u00f3n telesc\u00f3pica, impidiendo que el enganche se eleve por completo. La longitud correcta del eje se determina midiendo las dimensiones comprimida y extendida para la combinaci\u00f3n espec\u00edfica de tractor e implemento y confirmando que existe una superposici\u00f3n adecuada en ambas posiciones. La mayor\u00eda de los fabricantes de implementos especifican una superposici\u00f3n m\u00ednima del eje de al menos un tercio de la longitud comprimida.<\/p>\n

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

La protecci\u00f3n contra sobrecargas entre el eje de la toma de fuerza (TDF) y la entrada de la caja de cambios se proporciona mediante un perno de seguridad montado en el eje de entrada de la caja de cambios o un embrague deslizante integrado en el conjunto del eje de transmisi\u00f3n de la TDF. El perno de seguridad utiliza un perno de acero de baja resistencia que se fractura a un par de torsi\u00f3n definido, interrumpiendo la transmisi\u00f3n de potencia instant\u00e1neamente. El embrague deslizante permite que la transmisi\u00f3n se deslice a un l\u00edmite de par de torsi\u00f3n preestablecido, proporcionando protecci\u00f3n continua sin necesidad de reemplazar el perno despu\u00e9s de cada evento. CMN Transmission recomienda operar siempre con un dispositivo de protecci\u00f3n contra sobrecargas adecuado y nunca anular el perno de seguridad sustituy\u00e9ndolo por uno de mayor resistencia, ya que al hacerlo se traslada el punto de falla del dispositivo de sacrificio a los componentes internos de la caja de cambios o al eje de la TDF del tractor.<\/p>\n

La verificaci\u00f3n final de las especificaciones cr\u00edticas consiste en hacer coincidir el par nominal del eje de la toma de fuerza (TDF) con el par m\u00e1ximo nominal de la caja de engranajes. Al seleccionar piezas para la caja de engranajes de la cortadora rotativa, incluido un eje de TDF de repuesto, verifique que la capacidad de par nominal del eje cumpla o supere el par m\u00e1ximo de salida de la RC-120 con la relaci\u00f3n de transmisi\u00f3n seleccionada. El uso de un eje de TDF de tama\u00f1o insuficiente en una aplicaci\u00f3n con caja de engranajes para cortadora rotativa de 60 HP o 75 HP es una causa com\u00fan de fractura del eje, lo que pone en riesgo tanto al equipo como a los operadores durante el trabajo de campo.<\/p>\n\n\n\n
\"Caja<\/td>\n\"Eje<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u00bfPor qu\u00e9 elegir las cajas de engranajes para cortadoras rotativas de CMN Transmission?<\/h2>\n

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

La gama de productos de CMN cubre todo el espectro de aplicaciones de cajas de engranajes agr\u00edcolas: cajas de engranajes para cortadoras rotativas, cultivadoras rotativas, mezcladoras de piensos, segadoras rotativas, esparcidoras de fertilizantes, segadoras de martillos, perforadoras de postes, empacadoras redondas, empacadoras cuadradas, segadoras de discos, sistemas de riego de pivote central, accionamientos hidr\u00e1ulicos, m\u00e1quinas de ensilaje, pulverizadores para huertos, rastrillos rotativos, cosechadoras combinadas, almacenamiento y transporte de grano, cabezales de ma\u00edz, barras de corte, alimentaci\u00f3n av\u00edcola y cajas de engranajes agr\u00edcolas a medida que cubren casi mil especificaciones. Estos productos se utilizan en equipos de cosecha de grano, maquinaria forrajera, segadoras, empacadoras, rastrillos, cultivadoras rotativas, esparcidoras de fertilizantes, pulverizadores, mezcladoras de piensos, m\u00e1quinas de ensilaje y cosechadoras combinadas en todo el mundo.<\/p>\n

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

\"Fabricantes<\/p>\n

Preguntas frecuentes<\/h2>\n

Q: What oil type and how much oil does the RC-120 rotary cutter gearbox require?<\/strong>
\nA: La RC-120 tiene una capacidad de aceite para engranajes de 1,8 litros (60 oz). La mayor\u00eda de las cajas de engranajes de cortadoras rotativas utilizan aceite para engranajes SAE 90 o SAE 140, aunque algunos fabricantes recomiendan un aceite multigrado como el 80W-90. Siempre verifique las especificaciones del fabricante de la caja de engranajes y evite mezclar diferentes tipos de aceite. Mantener el nivel correcto de aceite en la caja de engranajes de la cortadora rotativa es esencial para prevenir el sobrecalentamiento y el desgaste prematuro. Verifique el nivel de aceite antes de cada uso y c\u00e1mbielo despu\u00e9s de las primeras 25 horas en una unidad nueva, y luego cada 100 a 200 horas de funcionamiento.<\/p>\n

Q: Is the RC-120 a direct replacement for the Omni RC-120 gearbox?<\/strong>
\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

Q: What does the rotary cutter gearbox ratio mean and which ratio should I choose?<\/strong>
\nA: La relaci\u00f3n de transmisi\u00f3n de la caja de engranajes de la cortadora rotativa describe la relaci\u00f3n entre la velocidad del eje de entrada (de la toma de fuerza del tractor) y la velocidad del eje de salida (que acciona la cuchilla). Una relaci\u00f3n de 1:1 significa que la salida gira a la misma velocidad que la entrada. Una relaci\u00f3n de 1:1,92 significa que la salida gira 1,92 veces m\u00e1s r\u00e1pido que la entrada, lo que proporciona una mayor velocidad en la punta de la cuchilla, adecuada para c\u00e9sped ligero y aplicaciones de cajas de engranajes de segadoras de acabado. Una relaci\u00f3n de 1,21:1 proporciona una reducci\u00f3n de velocidad y un aumento de par, preferible para maleza densa, vegetaci\u00f3n h\u00fameda o terrenos escarpados. Seleccione la relaci\u00f3n que mejor se adapte a la velocidad de la toma de fuerza de su tractor y a la aplicaci\u00f3n de corte deseada.<\/p>\n

P: \u00bfC\u00f3mo puedo saber si la caja de engranajes de mi cortadora rotativa necesita ser reparada o reemplazada?<\/strong>
\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

Q: Can I use this gearbox on a 40 HP, 60 HP, 75 HP, or 100 HP tractor?<\/strong>
\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

Q: What causes rotary cutter gearbox oil leaks and how do I fix them?<\/strong>
\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

Q: What rotary cutter gearbox parts are available for the RC-120?<\/strong>
\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

Q: How long does delivery take and does CMN ship internationally?<\/strong>
\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

Q: What is the difference between a rotary mower gearbox and a rotary cutter gearbox?<\/strong>
\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

Q: How do I find the correct rotary cutter gearbox for sale that fits my implement?<\/strong>
\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

Q: Can I use synthetic gear oil in my rotary cutter gearbox?<\/strong>
\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

\"Caja<\/p>\n

Opiniones de los clientes<\/h2>\n

Travis Holloway, Pasture Management, United States<\/strong>
\n\u201cUtilizo un tractor John Deere de 90 CV en unas 200 hect\u00e1reas de pastizales mixtos y riberas de arroyos, y la caja de cambios original de mi segadora Rhino se averi\u00f3 tras tres temporadas de uso intensivo. Encontr\u00e9 este repuesto RC-120 a trav\u00e9s de CMN y, sinceramente, no sab\u00eda qu\u00e9 esperar de una unidad de recambio a este precio. Pues bien, la instal\u00e9 en aproximadamente una hora utilizando el mismo patr\u00f3n de tornillos, sin taladrar, sin adaptadores, nada. Llevo seis meses us\u00e1ndola intensamente en pastos densos y en las orillas de los arroyos, y no he tenido ni un solo problema. El aceite est\u00e1 limpio, no hay fugas ni ruidos extra\u00f1os. Estoy realmente impresionado. Volver\u00e9 a comprarla cuando la necesite.\u201d<\/p>\n

Derek Fontaine, Vegetation Management, Canada<\/strong>
\n\u201cTenemos un contrato de mantenimiento de carreteras en Ontario y nuestras cajas de engranajes se desgastan m\u00e1s r\u00e1pido que las de la mayor\u00eda. Probamos la RC-120 de CMN hace aproximadamente un a\u00f1o, tras la recomendaci\u00f3n de otro contratista. Dos de nuestras unidades llevan funcionando con la caja de engranajes de repuesto de CMN unas 350 horas cada una. Los sellos siguen intactos, no hay fugas de aceite y ambas funcionan con una relaci\u00f3n de 1:1,46, que se adapta perfectamente a nuestro Kubota de 100 CV para cortar hierba mixta y maleza ligera en los arcenes de las carreteras. El embalaje desde Corea tambi\u00e9n estaba muy bien hecho; no sufri\u00f3 da\u00f1os durante el env\u00edo, algo que ha sido un problema con otros proveedores. El servicio de atenci\u00f3n al cliente respondi\u00f3 r\u00e1pidamente cuando tuve una pregunta sobre la selecci\u00f3n de la relaci\u00f3n. Un producto y un proveedor realmente excelentes.\u201d<\/p>\n

Rodrigo Alves Ferreira, Sugar Cane Operations, Brazil<\/strong>
\n\u201cCompr\u00e9 esto para mi plantaci\u00f3n de ca\u00f1a de az\u00facar en el estado de S\u00e3o Paulo. Lo usamos en un tractor de 75 HP para triturar los restos de ca\u00f1a despu\u00e9s de la cosecha y soporta bien la carga. La relaci\u00f3n 1:1.21 nos da el torque que necesitamos sin sobrecargar el tractor. El env\u00edo a Brasil tard\u00f3 unas 3 semanas, lo cual es normal para productos importados aqu\u00ed, y la aduana no present\u00f3 ning\u00fan problema. La \u00fanica raz\u00f3n por la que no le doy cinco estrellas es que tuve que conseguir el aceite para engranajes localmente, ya que no ven\u00eda incluido, lo cual es normal pero vale la pena mencionarlo. Todo lo dem\u00e1s de esta compra fue excelente y volver\u00eda a comprarlo sin dudarlo. El equipo de CMN respondi\u00f3 a mis preguntas previas a la compra sobre las dimensiones del eje de forma muy clara y r\u00e1pida.\u201d<\/p>\n

Klaus-Dieter Brandt, Farm Machinery, Germany<\/strong>
\nUtilizamos la RC-120 en nuestra desbrozadora de martillos con un tractor de 120 CV, principalmente para triturar los m\u00e1rgenes de los campos y la maleza de los setos. En cuanto a calidad, la caja de cambios da una impresi\u00f3n muy s\u00f3lida; la carcasa de hierro fundido nodular est\u00e1 bien fabricada y las juntas encajan a la perfecci\u00f3n. No hubo fugas de aceite despu\u00e9s de la primera temporada, ni ruidos extra\u00f1os, nada. Inicialmente ten\u00eda dudas por ser un fabricante coreano, pero CMN super\u00f3 con creces mis expectativas. La comunicaci\u00f3n en ingl\u00e9s fue fluida y la entrega a Alemania tard\u00f3 12 d\u00edas laborables a trav\u00e9s de DHL Express. Muy recomendable para cualquiera que busque una caja de cambios de repuesto fiable.<\/p>\n

Brendan Carrick, Pasture Maintenance, Australia<\/strong>
\nGestiono unas 400 hect\u00e1reas de pastizales ovinos en Nueva Gales del Sur y el mantenimiento de los pastos es constante. La caja de cambios original de mi desbrozadora McConnel se averi\u00f3 a mitad de temporada, justo cuando m\u00e1s la necesitaba. CMN ten\u00eda la RC-120 disponible de inmediato y su equipo de soporte confirm\u00f3 que las especificaciones coincid\u00edan con las de mi unidad antes de realizar el pedido. Lleg\u00f3 en 10 d\u00edas h\u00e1biles, m\u00e1s r\u00e1pido de lo que esperaba para una entrega en la zona rural de Nueva Gales del Sur. La instalaci\u00f3n tard\u00f3 menos de una hora. Eso fue hace 8 meses y desde entonces le he dedicado unas 180 horas de funcionamiento en todo tipo de cultivos, desde kikuyu seco hasta centeno h\u00famedo. El engranaje funciona con suavidad, no hay holgura en el eje de salida y los sellos se mantienen en perfecto estado en condiciones de campo polvoriento.<\/p>\n

Hernan Gomez Vargas, Sugar Cane Farm, Colombia<\/strong>
\n\u201cCompr\u00e9 la RC-120 para reemplazar la caja de engranajes original de mi cortadora rotativa que usamos en la finca de ca\u00f1a de az\u00facar en Tolima. La hemos estado usando a plena capacidad durante 4 meses y hasta ahora no hemos tenido ning\u00fan problema. La instalamos nosotros mismos siguiendo las instrucciones que CMN nos envi\u00f3 por correo electr\u00f3nico. Me gust\u00f3 mucho que el equipo de ventas respondiera mis preguntas r\u00e1pidamente por correo electr\u00f3nico y confirmara que el modelo era compatible con mi m\u00e1quina antes de realizar el pedido. El env\u00edo a Colombia tard\u00f3 3 semanas, lo cual est\u00e1 bien. El precio es muy competitivo para la calidad que ofrece. Ya he recomendado el producto a otros agricultores de la regi\u00f3n.\u201d<\/p>\n

Simon Partridge, Roads Maintenance, United Kingdom<\/strong>
\nTrabajo para una autoridad vial local en Lincolnshire y mantenemos aproximadamente 600 km de arcenes rurales cada a\u00f1o. En los \u00faltimos dos a\u00f1os, hemos estandarizado el uso del RC-120 de CMN para nuestra flota de desbrozadoras montadas en tractor. De las 11 unidades que hemos adquirido hasta la fecha, ninguna ha requerido garant\u00eda. La consistencia de la calidad entre lotes fue un aspecto que evaluamos espec\u00edficamente antes de comprometernos con este proveedor a gran escala, y CMN super\u00f3 las pruebas. Su documentaci\u00f3n de exportaci\u00f3n y los certificados CE tambi\u00e9n estaban completos y correctos desde la primera solicitud, lo cual es fundamental para nuestro proceso de adquisici\u00f3n. A cualquier autoridad local o contratista que busque proveedores confiables de cajas de engranajes para desbrozadoras rotativas, les recomendar\u00eda CMN sin dudarlo.<\/p>\n

Manuel Diaz Moreno, Sunflower and Cereal Stubble, Spain<\/strong>
\n\u201cLlevo muchos a\u00f1os trabajando con segadoras rotativas en Andaluc\u00eda y siempre he buscado piezas de calidad a un precio razonable. La RC-120 de CMN Transmission cumple con creces estas expectativas. La montamos en una segadora de 90 CV para limpiar los rastrojos de girasol y cereales tras la cosecha. La relaci\u00f3n 1:1,92 es perfecta para este trabajo. El acabado de la carcasa es bueno, las juntas vienen bien ajustadas de f\u00e1brica y no ha perdido aceite en las primeras 120 horas de uso. El servicio t\u00e9cnico de CMN resolvi\u00f3 una duda que ten\u00edamos sobre el nivel de aceite correcto en menos de dos horas por correo electr\u00f3nico. Estamos muy satisfechos con la compra y con la atenci\u00f3n recibida por parte del equipo de ventas.\u201d<\/p>\n

Suresh Patel, Cortando tallos de arroz y trigo, India<\/strong>
\nEn nuestra granja, usamos esta caja de engranajes RC-120 en una segadora rotativa con un tractor de 60 CV, que utilizamos para cortar tallos de arroz y hierba. La instalaci\u00f3n de esta caja de engranajes fue muy sencilla y el equipo de CMN respondi\u00f3 a todas nuestras preguntas durante todo el proceso. No tuvimos ning\u00fan problema en los primeros tres meses. Nuestra antigua caja de engranajes se averi\u00f3 en dos temporadas; viendo la calidad de esta nueva, parece que durar\u00e1 m\u00e1s. Recomiendo CMN. El embalaje tambi\u00e9n fue excelente, no sufri\u00f3 ning\u00fan da\u00f1o y el plazo de entrega fue razonable.<\/p>","protected":false},"excerpt":{"rendered":"

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.<\/p>","protected":false},"featured_media":7849,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[301],"product_tag":[303,302,306,304,307,305,308],"class_list":{"0":"post-7960","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-rotary-cutter-gearbox","7":"product_tag-gearbox-for-rotary-cutter","8":"product_tag-rotary-cutter-gearbox","9":"product_tag-rotary-cutter-gearbox-for-sale","10":"product_tag-rotary-cutter-gearbox-manufacturers","11":"product_tag-rotary-cutter-gearbox-ratio","12":"product_tag-rotary-cutter-gearbox-suppliers","13":"product_tag-rotary-mower-gearbox","15":"first","16":"instock","17":"shipping-taxable","18":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/korea-transmission.com\/es\/wp-json\/wp\/v2\/product\/7960","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/korea-transmission.com\/es\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/es\/wp-json\/wp\/v2\/comments?post=7960"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/es\/wp-json\/wp\/v2\/media\/7849"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/es\/wp-json\/wp\/v2\/media?parent=7960"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/korea-transmission.com\/es\/wp-json\/wp\/v2\/product_brand?post=7960"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/korea-transmission.com\/es\/wp-json\/wp\/v2\/product_cat?post=7960"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/es\/wp-json\/wp\/v2\/product_tag?post=7960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}