{"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\/pt\/produto\/rc-120-rotary-cutter-gearbox-replacement-for-omni-rc-120-gearbox\/","title":{"rendered":"Caixa de engrenagens de substitui\u00e7\u00e3o para cortador rotativo RC-120 da Omni."},"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

\"Caixa<\/p>\n

Especifica\u00e7\u00f5es do produto<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Modelo:<\/td>\nCaixa de c\u00e2mbio RC-120<\/td>\n<\/tr>\n
Classifica\u00e7\u00e3o HP<\/td>\n51 \u2013 161 HP<\/td>\n<\/tr>\n
Torque:<\/td>\n7.117 \u2013 19.950 lb.-pol.
\n(803 \u2013 2.252 Nm.)<\/td>\n<\/tr>\n
Propor\u00e7\u00f5es:<\/td>\n1.21:1, 1:1, 1:1.21, 1:1.46, 1:1.92<\/td>\n<\/tr>\n
Tipo de engrenagem:<\/td>\nBisel<\/td>\n<\/tr>\n
Tipo de veda\u00e7\u00e3o:<\/td>\nTripla camada de mola<\/td>\n<\/tr>\n
Tipo de rolamento:<\/td>\nRolo c\u00f4nico<\/td>\n<\/tr>\n
Capacidade de \u00f3leo:<\/td>\n60 on\u00e7as.
\n(1.8 L)<\/td>\n<\/tr>\n
Peso:<\/td>\n109 libras.
\n(49,9 kg)<\/td>\n<\/tr>\n
Aplica\u00e7\u00f5es:<\/td>\nCortadores de grama de acabamento
\nCortadores rotativos
\nCortadores rotativos<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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

\"Dimens\u00f5es<\/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 da unidade<\/th>\nCL para atrav\u00e9s da tampa A<\/th>\nCL para Flange B<\/th>\nPiloto C de flange para cubo<\/th>\nDi\u00e2metro do piloto do cubo H<\/th>\nDi\u00e2metro do flange D1<\/th>\nPadr\u00e3o de furos para parafusos E1<\/th>\nFuros de montagem F1<\/th>\nTamanho quadrado da flange D2<\/th>\nPadr\u00e3o de furos para parafusos E2<\/th>\nFuros de montagem F2<\/th>\n<\/tr>\n
Libra<\/th>\nkg<\/th>\nem<\/th>\nmil\u00edmetros<\/th>\nem<\/th>\nmil\u00edmetros<\/th>\nem<\/th>\nmil\u00edmetros<\/th>\nem<\/th>\nmil\u00edmetros<\/th>\nem<\/th>\nmil\u00edmetros<\/th>\nem<\/th>\nmil\u00edmetros<\/th>\nem<\/th>\nmil\u00edmetros<\/th>\nem<\/th>\nmil\u00edmetros<\/th>\nem<\/th>\nmil\u00edmetros<\/th>\nem<\/th>\nmil\u00edmetros<\/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
\nA caixa de engrenagens RC-120 conecta-se diretamente ao eixo da tomada de for\u00e7a (TDF) do trator e suporta totalmente as velocidades de entrada padr\u00e3o de 540 RPM e 1.000 RPM. O eixo de entrada estriado aceita engates r\u00e1pidos, permitindo instala\u00e7\u00e3o e remo\u00e7\u00e3o r\u00e1pidas no campo sem a necessidade de ferramentas especiais. Essa ampla compatibilidade com a TDF permite que a caixa de engrenagens seja utilizada com tratores utilit\u00e1rios compactos, tratores agr\u00edcolas de m\u00e9dio porte e grandes implementos agr\u00edcolas 4x4 sem a necessidade de eixos adaptadores ou modifica\u00e7\u00f5es 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. Prote\u00e7\u00e3o contra sobrecarga
\nA RC-120 foi projetada para aceitar sistemas opcionais de embreagem de roda livre ou prote\u00e7\u00e3o contra sobrecarga por parafuso de cisalhamento no eixo de entrada. Quando as l\u00e2minas de corte atingem um obst\u00e1culo im\u00f3vel em velocidade m\u00e1xima, o dispositivo de sobrecarga se desengata ou corta antes que o torque catastr\u00f3fico seja transmitido atrav\u00e9s do conjunto de engrenagens c\u00f4nicas, protegendo tanto os componentes internos da caixa de engrenagens quanto a transmiss\u00e3o da tomada de for\u00e7a (TDF) do trator contra quebras. Esse mecanismo de seguran\u00e7a integrado \u00e9 especialmente importante ao operar em \u00e1reas com detritos enterrados, tocos de \u00e1rvores escondidos ou afloramentos rochosos, onde n\u00e3o se pode prever o travamento repentino das l\u00e2minas.<\/p>\n

\"Caixa<\/p>\n

Princ\u00edpio de funcionamento<\/h2>\n

A caixa de engrenagens RC-120 para cortadores rotativos serve como elemento central de transmiss\u00e3o de pot\u00eancia em qualquer cortador rotativo, ro\u00e7adeira de acabamento ou implemento ro\u00e7ador rotativo. Seu princ\u00edpio de funcionamento come\u00e7a no eixo da tomada de for\u00e7a (TDF) do trator, que fornece energia rotacional a 540 ou 1.000 RPM, dependendo da configura\u00e7\u00e3o padr\u00e3o e da velocidade selecionada pela TDF do trator. Essa energia rotacional horizontal entra na caixa de engrenagens atrav\u00e9s do eixo de entrada em a\u00e7o-liga temperado, que \u00e9 suportado em ambas as extremidades por rolamentos de rolos c\u00f4nicos de precis\u00e3o. Esses rolamentos gerenciam tanto as cargas radiais provenientes do engrenamento das engrenagens quanto as cargas axiais geradas durante mudan\u00e7as de dire\u00e7\u00e3o e flutua\u00e7\u00f5es de carga.<\/p>\n

Dentro da carca\u00e7a de ferro fundido d\u00factil, o eixo de entrada aciona a engrenagem c\u00f4nica principal. O conjunto de engrenagens c\u00f4nicas \u00e9 o cora\u00e7\u00e3o do funcionamento da caixa de engrenagens agr\u00edcola, pois redireciona a entrada horizontal da tomada de for\u00e7a (TDF) em exatamente 90 graus, ajustando simultaneamente a rela\u00e7\u00e3o de velocidade e torque entre a entrada e a sa\u00edda. Em rela\u00e7\u00f5es de alta velocidade, como 1:1,92, o eixo de sa\u00edda gira significativamente mais r\u00e1pido que o de entrada, produzindo a alta velocidade da ponta da l\u00e2mina necess\u00e1ria para um corte limpo da grama em uma aplica\u00e7\u00e3o de caixa de engrenagens de ro\u00e7adeira de acabamento. Em rela\u00e7\u00f5es de redu\u00e7\u00e3o, como 1,21:1, as engrenagens c\u00f4nicas aumentam o torque de sa\u00edda em rela\u00e7\u00e3o ao torque de entrada, dando \u00e0 caixa de engrenagens da ro\u00e7adeira rotativa a vantagem mec\u00e2nica necess\u00e1ria para atravessar arbustos densos, caules lenhosos e vegeta\u00e7\u00e3o \u00famida e densa sem travar.<\/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 caixa de engrenagens da 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

A configura\u00e7\u00e3o de m\u00faltiplas velocidades do RC-120 tamb\u00e9m favorece a adaptabilidade ao terreno, permitindo que os operadores selecionem uma rela\u00e7\u00e3o de transmiss\u00e3o da l\u00e2mina rotativa adequada \u00e0s condi\u00e7\u00f5es espec\u00edficas do campo: declives acentuados e zonas \u00famidas se beneficiam de rela\u00e7\u00f5es de torque mais altas, enquanto campos planos e acabados s\u00e3o melhor atendidos por rela\u00e7\u00f5es de velocidade da l\u00e2mina mais r\u00e1pidas, que produzem um corte mais preciso.<\/p>\n

\"Caixa<\/p>\n

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

Corte de grama e tritura\u00e7\u00e3o de palha<\/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

Limpeza de arbustos e silvas<\/h3>\n

Oferece o alto torque necess\u00e1rio para cortar arbustos lenhosos e densos, sar\u00e7as e mudas finas nas bordas de pomares, bosques e cercas. A robusta engrenagem c\u00f4nica e a carca\u00e7a refor\u00e7ada da RC-120 absorvem a energia do impacto de golpes repetidos em caules lenhosos e densos ao longo do dia de trabalho, sem fadiga dos dentes da engrenagem ou fratura da carca\u00e7a, tornando esta caixa de engrenagens para ro\u00e7adeira rotativa a escolha profissional para opera\u00e7\u00f5es de desmatamento.<\/p>\n<\/div>\n

\n

Prepara\u00e7\u00e3o do solo agr\u00edcola e tratamento da palha.<\/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

Gest\u00e3o de \u00e1reas de pomares e vinhedos<\/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

Controle da vegeta\u00e7\u00e3o nas margens das rodovias e faixas de dom\u00ednio<\/h3>\n

Departamentos rodovi\u00e1rios, corredores de servi\u00e7os p\u00fablicos e programas de manuten\u00e7\u00e3o de faixas de dom\u00ednio de oleodutos dependem de ro\u00e7adeiras rotativas para a ro\u00e7ada sazonal cont\u00ednua. A faixa de pot\u00eancia nominal da RC-120, de 51 a 161 HP, abrange desde ro\u00e7adeiras compactas acopladas a tratores at\u00e9 grandes unidades com bra\u00e7o articulado usadas em opera\u00e7\u00f5es de ro\u00e7ada em rodovias em alta velocidade, onde o torque de sa\u00edda consistente em diferentes espessuras de grama \u00e9 essencial para uma opera\u00e7\u00e3o segura e 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

Pecuaristas e produtores de gado utilizam ro\u00e7adeiras rotativas com a caixa de engrenagens RC-120 para reduzir a infesta\u00e7\u00e3o de ervas daninhas e promover o crescimento da pastagem entre os ciclos de pastejo. O corte da vegeta\u00e7\u00e3o madura da pastagem na altura ideal estimula o perfilhamento e a expans\u00e3o lateral de esp\u00e9cies forrageiras desej\u00e1veis, melhorando a produtividade da pastagem a longo prazo. A faixa de pot\u00eancia de 75 HP e 100 HP da caixa de engrenagens para ro\u00e7adeiras rotativas abrange os tamanhos de tratores mais comuns utilizados em fazendas para esse trabalho.<\/p>\n<\/div>\n

\n

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

Empreiteiros de desmatamento que trabalham em \u00e1reas com alta densidade de mudas utilizam ro\u00e7adeiras rotativas robustas acopladas ao RC-120 para derrubar e triturar \u00e1rvores jovens com at\u00e9 alguns cent\u00edmetros de di\u00e2metro. O torque m\u00e1ximo da caixa de engrenagens, de 2.252 Nm, fornece a for\u00e7a da l\u00e2mina necess\u00e1ria para cortar material lenhoso denso em um ritmo produtivo, enquanto a carca\u00e7a de ferro fundido d\u00factil oferece a rigidez estrutural para absorver impactos repetidos de alta energia da l\u00e2mina sem rachar ou deformar sob uso comercial cont\u00ednuo.<\/p>\n<\/div>\n

\"Aplica\u00e7\u00f5es<\/p>\n

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

1. Carca\u00e7a da caixa de c\u00e2mbio
\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. Engrenagens C\u00f4nicas
\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. Eixo de entrada
\nO eixo que se conecta diretamente \u00e0 tomada de for\u00e7a (TDF) do trator. Fabricado em a\u00e7o liga cementado para m\u00e1xima resist\u00eancia \u00e0 tor\u00e7\u00e3o, ele recebe a pot\u00eancia rotacional do eixo de transmiss\u00e3o da TDF do implemento e a transfere para o engrenamento. As configura\u00e7\u00f5es de estrias padr\u00e3o, incluindo 1-3\/8 polegadas com seis estrias e 1-3\/4 polegadas com seis estrias, permitem que o RC-120 seja compat\u00edvel com uma ampla gama de modelos de tratores sem necessidade de adapta\u00e7\u00e3o ou pe\u00e7as adicionais.<\/p>\n

4. Eixo de sa\u00edda
\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. Rolamentos
\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. Retentores de \u00f3leo
\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

\"Pe\u00e7as<\/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

\"Caixa<\/p>\n

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

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

Causa:<\/strong>\u00a0Worn or damaged bevel gears, incorrect gear backlash, or insufficient rotary cutter gearbox oil level.
\nSolution:<\/strong>\u00a0Verifique e corrija o n\u00edvel de \u00f3leo primeiro. Se o ru\u00eddo persistir, remova as tampas da carca\u00e7a e inspecione as superf\u00edcies dos dentes das engrenagens em busca de corros\u00e3o, lascas ou quebras. Ajuste a folga das engrenagens de acordo com as especifica\u00e7\u00f5es do fabricante. Substitua as engrenagens desgastadas como parte da reconstru\u00e7\u00e3o da caixa de engrenagens da cortadora rotativa se forem confirmados danos nos dentes durante a inspe\u00e7\u00e3o.<\/p>\n<\/div>\n

\n

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

Causa:<\/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

Superaquecimento durante a opera\u00e7\u00e3o<\/h3>\n

Causa:<\/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

Causa:<\/strong>\u00a0Worn tapered roller bearings, loose bearing preload adjustment, or a bent shaft from a severe blade strike.
\nSolution:<\/strong>\u00a0Me\u00e7a a folga axial do eixo em rela\u00e7\u00e3o \u00e0 toler\u00e2ncia do fabricante. Ajuste a pr\u00e9-carga do rolamento se estiver dentro da faixa de ajuste. Substitua os rolamentos que apresentarem corros\u00e3o, descolora\u00e7\u00e3o ou aspereza nas superf\u00edcies de rolamento. Inspecione o eixo para verificar se est\u00e1 reto. Vibra\u00e7\u00f5es excessivas transmitem for\u00e7as prejudiciais \u00e0 transmiss\u00e3o da tomada de for\u00e7a do trator se n\u00e3o forem corrigidas imediatamente.<\/p>\n<\/div>\n

\n

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

Causa:<\/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

Causa:<\/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

Causa:<\/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

Causa:<\/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

\"Caixa<\/p>\n

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

A caixa de engrenagens da ro\u00e7adeira rotativa e o eixo da tomada de for\u00e7a (TDF) formam juntos o circuito mec\u00e2nico completo de transmiss\u00e3o de pot\u00eancia entre o motor do trator e as l\u00e2minas de corte sob a plataforma de corte. Compreender essa rela\u00e7\u00e3o \u00e9 essencial para qualquer pessoa que selecione, instale ou fa\u00e7a manuten\u00e7\u00e3o nesses componentes, seja na compra de uma caixa de engrenagens de ro\u00e7adeira rotativa de 40 HP para um trator compacto ou de uma caixa de engrenagens de ro\u00e7adeira rotativa de 100 HP para uma grande opera\u00e7\u00e3o comercial de corte de grama.<\/p>\n

O eixo da tomada de for\u00e7a (TDF) \u00e9 um eixo telesc\u00f3pico com juntas universais em cada extremidade, que conecta o flange de sa\u00edda da TDF traseira do trator ao eixo de entrada da caixa de engrenagens. As normas para TDF de tratores determinam que o eixo gire a 540 RPM (normalmente em tratores com pot\u00eancia inferior a 50 HP) ou 1.000 RPM (mais comum em tratores de maior pot\u00eancia), com a rota\u00e7\u00e3o ocorrendo no sentido especificado pelo fabricante do trator. O eixo da TDF \u00e9 protegido por uma prote\u00e7\u00e3o pl\u00e1stica que impede o contato com o conjunto rotativo durante a opera\u00e7\u00e3o. Tanto a prote\u00e7\u00e3o quanto o pr\u00f3prio eixo devem ser mantidos em boas condi\u00e7\u00f5es e adequados \u00e0 capacidade de torque exigida pelo implemento.<\/p>\n

A caixa de engrenagens da ro\u00e7adeira rotativa conecta-se diretamente do eixo da tomada de for\u00e7a (TDF) do trator at\u00e9 a barra de suporte das l\u00e2minas em um eixo vertical. A caixa de engrenagens e o eixo da TDF transferem a pot\u00eancia da tomada de for\u00e7a do trator para girar as pesadas l\u00e2minas da ro\u00e7adeira sob a plataforma de corte. A caixa de engrenagens suporta os fortes impactos quando as pesadas l\u00e2minas articuladas atingem vegeta\u00e7\u00e3o densa, pedras ou pequenas \u00e1rvores em velocidade de opera\u00e7\u00e3o. Esses impactos geram picos repentinos de torque que podem ser muitas vezes maiores que o torque operacional m\u00e9dio, e a carca\u00e7a da caixa de engrenagens, a geometria dos dentes da engrenagem e a sele\u00e7\u00e3o dos rolamentos s\u00e3o projetadas especificamente para absorver e dissipar esses picos sem falhas.<\/p>\n

O comprimento do eixo da tomada de for\u00e7a (TDF) \u00e9 crucial para uma transfer\u00eancia de pot\u00eancia segura e eficiente. Se o eixo for muito curto, as se\u00e7\u00f5es telesc\u00f3picas podem colapsar completamente durante o levantamento ou abaixamento do engate de tr\u00eas pontos do implemento, fazendo com que o eixo da TDF se desengate ou quebre. Se for muito longo, o eixo pode atingir o limite inferior em sua posi\u00e7\u00e3o telesc\u00f3pica, impedindo que o engate seja totalmente levantado. O comprimento correto do eixo \u00e9 determinado medindo-se as dimens\u00f5es comprimidas e estendidas para a combina\u00e7\u00e3o espec\u00edfica de trator e implemento e confirmando-se se h\u00e1 sobreposi\u00e7\u00e3o adequada em ambas as posi\u00e7\u00f5es. A maioria dos fabricantes de implementos especifica uma sobreposi\u00e7\u00e3o m\u00ednima do eixo de pelo menos um ter\u00e7o do comprimento comprimido.<\/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

A prote\u00e7\u00e3o contra sobrecarga entre o eixo da tomada de for\u00e7a (TDF) e a entrada da caixa de engrenagens \u00e9 fornecida por um cubo com parafuso de cisalhamento montado no eixo de entrada da caixa de engrenagens ou por uma embreagem deslizante incorporada ao conjunto do eixo de transmiss\u00e3o da TDF. O parafuso de cisalhamento utiliza um parafuso de a\u00e7o de baixa resist\u00eancia que se rompe a um torque definido, interrompendo instantaneamente a transmiss\u00e3o de pot\u00eancia. A embreagem deslizante permite que a transmiss\u00e3o deslize dentro de um limite de torque predefinido, proporcionando prote\u00e7\u00e3o cont\u00ednua sem a necessidade de substitui\u00e7\u00e3o do parafuso ap\u00f3s cada evento. A CMN Transmission recomenda operar sempre com um dispositivo de prote\u00e7\u00e3o contra sobrecarga adequado instalado e nunca substituir o parafuso de cisalhamento por um de maior resist\u00eancia, pois isso transfere o ponto de falha do dispositivo de sacrif\u00edcio para os componentes internos da caixa de engrenagens ou para o eixo da TDF do trator.<\/p>\n

A verifica\u00e7\u00e3o final e cr\u00edtica das especifica\u00e7\u00f5es \u00e9 garantir que a capacidade de torque do eixo da tomada de for\u00e7a (TDF) corresponda ao torque m\u00e1ximo nominal da caixa de engrenagens. Ao selecionar pe\u00e7as para a caixa de engrenagens da ro\u00e7adeira rotativa, incluindo um eixo de TDF de reposi\u00e7\u00e3o, verifique se a capacidade de torque especificada no eixo atende ou excede o torque m\u00e1ximo de sa\u00edda da RC-120 na rela\u00e7\u00e3o de transmiss\u00e3o selecionada. O uso de um eixo de TDF subdimensionado em uma caixa de engrenagens de ro\u00e7adeira rotativa de 60 HP ou 75 HP \u00e9 uma causa comum de fratura do eixo, colocando em risco tanto o equipamento quanto os operadores durante a opera\u00e7\u00e3o em campo.<\/p>\n\n\n\n
\"Caixa<\/td>\n\"Eixo<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Por que escolher as caixas de engrenagens para cortadores rotativos da 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

A gama de produtos da CMN abrange todo o espectro de aplica\u00e7\u00f5es de caixas de engrenagens agr\u00edcolas: caixas de engrenagens para ro\u00e7adeiras rotativas, ro\u00e7adeiras de solo, misturadores de ra\u00e7\u00e3o, segadoras rotativas, distribuidores de fertilizantes, ro\u00e7adeiras de martelos, perfuradoras de solo, enfardadeiras redondas, enfardadeiras quadradas, segadoras de discos, sistemas de irriga\u00e7\u00e3o por piv\u00f4 central, transmiss\u00f5es hidr\u00e1ulicas, ensiladeiras, pulverizadores para pomares, ancinhos rotativos, colheitadeiras, sistemas de armazenamento e transporte de gr\u00e3os, plataformas de corte de milho, barras de corte, sistemas de alimenta\u00e7\u00e3o de aves e caixas de engrenagens agr\u00edcolas personalizadas, abrangendo quase mil especifica\u00e7\u00f5es. Esses produtos atendem a equipamentos de colheita de gr\u00e3os, m\u00e1quinas para forragem, segadoras, enfardadeiras, ancinhos, ro\u00e7adeiras rotativas, distribuidores de fertilizantes, pulverizadores, misturadores de ra\u00e7\u00e3o, ensiladeiras e colheitadeiras em todo o 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

Perguntas frequentes<\/h2>\n

Q: What oil type and how much oil does the RC-120 rotary cutter gearbox require?<\/strong>
\nA: A RC-120 tem capacidade para 1,8 litros (60 oz) de \u00f3leo de engrenagem. A maioria das caixas de engrenagens de cortadores rotativos utiliza \u00f3leo de engrenagem SAE 90 ou SAE 140, embora alguns fabricantes recomendem um \u00f3leo multiviscoso, como o 80W-90. Sempre verifique as especifica\u00e7\u00f5es do fabricante da caixa de engrenagens e evite misturar diferentes tipos de \u00f3leo. Manter o n\u00edvel correto de \u00f3leo na caixa de engrenagens do cortador rotativo \u00e9 essencial para evitar superaquecimento e desgaste prematuro. Verifique o n\u00edvel de \u00f3leo antes de cada uso e troque o \u00f3leo ap\u00f3s as primeiras 25 horas em uma unidade nova e, posteriormente, a cada 100 a 200 horas de opera\u00e7\u00e3o.<\/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: A rela\u00e7\u00e3o de transmiss\u00e3o da caixa de engrenagens da ro\u00e7adeira rotativa descreve a rela\u00e7\u00e3o entre a velocidade do eixo de entrada (da tomada de for\u00e7a do trator) e a velocidade do eixo de sa\u00edda (que aciona a l\u00e2mina). Uma rela\u00e7\u00e3o de 1:1 significa que a sa\u00edda gira na mesma velocidade que a entrada. Uma rela\u00e7\u00e3o de 1:1,92 significa que a sa\u00edda gira 1,92 vezes mais r\u00e1pido que a entrada, proporcionando uma velocidade da ponta da l\u00e2mina mais alta, adequada para grama fina e aplica\u00e7\u00f5es de ro\u00e7adeiras de acabamento. Uma rela\u00e7\u00e3o de 1,21:1 proporciona uma redu\u00e7\u00e3o de velocidade e um aumento de torque, prefer\u00edvel para vegeta\u00e7\u00e3o densa, terrenos \u00famidos ou \u00edngremes. Selecione a rela\u00e7\u00e3o que melhor se adapte \u00e0 velocidade da tomada de for\u00e7a do seu trator e \u00e0 aplica\u00e7\u00e3o de corte desejada.<\/p>\n

P: Como sei se a caixa de engrenagens da minha cortadora rotativa precisa ser reconstru\u00edda ou substitu\u00edda?<\/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

\"Caixa<\/p>\n

Avalia\u00e7\u00f5es de clientes<\/h2>\n

Travis Holloway, Pasture Management, United States<\/strong>
\n\"Tenho um trator John Deere de 90 HP em cerca de 80 hectares de pasto misto e margens de riachos, e a caixa de engrenagens original do meu cortador Rhino quebrou depois de tr\u00eas temporadas de uso intenso. Encontrei esta pe\u00e7a de reposi\u00e7\u00e3o RC-120 na CMN e, sinceramente, n\u00e3o sabia o que esperar de uma unidade de reposi\u00e7\u00e3o com esse pre\u00e7o. Bem, instalei em cerca de uma hora usando o mesmo padr\u00e3o de parafusos, sem furos, sem adaptadores, nada. Venho usando intensamente h\u00e1 seis meses em grama Bermuda densa e em algumas margens de riachos com vegeta\u00e7\u00e3o densa, e nenhum problema. O \u00f3leo est\u00e1 limpo, sem vazamentos, sem ru\u00eddos estranhos. Estou realmente impressionado. Comprarei novamente quando precisar.\"<\/p>\n

Derek Fontaine, Vegetation Management, Canada<\/strong>
\n\u201cOperamos um servi\u00e7o de corte de grama em acostamentos de rodovias em Ont\u00e1rio e trocamos as caixas de engrenagens mais r\u00e1pido do que a maioria. Experimentamos a RC-120 da CMN h\u00e1 cerca de um ano, ap\u00f3s a recomenda\u00e7\u00e3o de outro prestador de servi\u00e7os. Duas de nossas unidades est\u00e3o usando a caixa de engrenagens de reposi\u00e7\u00e3o da CMN h\u00e1 cerca de 350 horas cada. As veda\u00e7\u00f5es ainda est\u00e3o firmes, n\u00e3o h\u00e1 vazamento de \u00f3leo e ambas est\u00e3o funcionando na rela\u00e7\u00e3o de 1:1,46, que \u00e9 perfeita para o nosso Kubota de 100 HP para grama mista e vegeta\u00e7\u00e3o rasteira ao longo dos acostamentos da rodovia. A embalagem da Coreia tamb\u00e9m era muito boa; nenhum dano durante o transporte, o que tem sido um problema com outros fornecedores. O atendimento foi r\u00e1pido quando tive uma d\u00favida sobre a sele\u00e7\u00e3o da rela\u00e7\u00e3o. Produto e fornecedor realmente excelentes.\u201d<\/p>\n

Rodrigo Alves Ferreira, Sugar Cane Operations, Brazil<\/strong>
\n\u201cComprei este produto para minha opera\u00e7\u00e3o de cana-de-a\u00e7\u00facar no estado de S\u00e3o Paulo. Usamos em um trator de 75 HP para triturar os restos da cana ap\u00f3s a colheita e ele suporta bem a carga. A rela\u00e7\u00e3o de 1:1,21 nos d\u00e1 o torque necess\u00e1rio sem sobrecarregar o trator. O envio para o Brasil levou cerca de 3 semanas, o que \u00e9 normal para produtos importados aqui, e a alf\u00e2ndega n\u00e3o apresentou problemas. O \u00fanico motivo pelo qual n\u00e3o dei cinco estrelas \u00e9 que precisei comprar o \u00f3leo de engrenagem localmente, pois n\u00e3o estava incluso, o que \u00e9 normal, mas vale a pena mencionar. Todo o resto sobre esta compra foi \u00f3timo e eu compraria novamente sem hesitar. A equipe da CMN respondeu \u00e0s minhas perguntas sobre as dimens\u00f5es do eixo antes da compra de forma muito clara e r\u00e1pida.\u201d<\/p>\n

Klaus-Dieter Brandt, Farm Machinery, Germany<\/strong>
\n\u201cUtilizamos a RC-120 em nosso cortador de grama com um trator de 120 HP, principalmente para triturar as margens dos campos e a vegeta\u00e7\u00e3o rasteira das sebes. Em termos de qualidade, a caixa de engrenagens causa uma \u00f3tima impress\u00e3o; a carca\u00e7a de ferro fundido nodular \u00e9 bem fabricada e as veda\u00e7\u00f5es se encaixam perfeitamente. Sem vazamentos de \u00f3leo ap\u00f3s a primeira temporada, sem ru\u00eddos, nada. Inicialmente, eu tinha receio por ser um fabricante coreano, mas a CMN claramente superou as expectativas. A comunica\u00e7\u00e3o em ingl\u00eas foi direta e a entrega para a Alemanha levou 12 dias \u00fateis via DHL Express. Altamente recomendada para quem procura uma caixa de engrenagens de reposi\u00e7\u00e3o robusta.\u201d<\/p>\n

Brendan Carrick, Pasture Maintenance, Australia<\/strong>
\n\u201cGerencio cerca de 400 hectares de pastagens para ovelhas em Nova Gales do Sul e a manuten\u00e7\u00e3o do pasto \u00e9 constante. A caixa de engrenagens original da minha ro\u00e7adeira McConnel pifou no meio da temporada, justamente quando eu mais precisava. A CMN tinha a RC-120 dispon\u00edvel imediatamente e a equipe de suporte confirmou que as especifica\u00e7\u00f5es correspondiam \u00e0 minha unidade antes de eu fazer o pedido. Ela chegou em 10 dias \u00fateis, o que foi mais r\u00e1pido do que eu esperava para uma entrega no interior de Nova Gales do Sul. A instala\u00e7\u00e3o levou menos de uma hora. Isso foi h\u00e1 8 meses e, desde ent\u00e3o, provavelmente j\u00e1 acumulei 180 horas de opera\u00e7\u00e3o em diversos tipos de pastagens, desde capim-quicuio seco at\u00e9 centeio \u00famido. O engate das engrenagens \u00e9 suave, n\u00e3o h\u00e1 folga no eixo de sa\u00edda e as veda\u00e7\u00f5es est\u00e3o funcionando perfeitamente em condi\u00e7\u00f5es de pasto empoeirado.\u201d<\/p>\n

Hernan Gomez Vargas, Sugar Cane Farm, Colombia<\/strong>
\n\u201cComprei a RC-120 para substituir a caixa de engrenagens original da minha colhedora rotativa que usamos na fazenda de cana-de-a\u00e7\u00facar em Tolima. Estamos usando-a em plena capacidade h\u00e1 4 meses e n\u00e3o tivemos nenhum problema at\u00e9 agora. N\u00f3s mesmos a instalamos seguindo as instru\u00e7\u00f5es que a CMN nos enviou por e-mail. Gostei muito da rapidez com que a equipe de vendas respondeu \u00e0s minhas perguntas por e-mail e confirmou que o modelo era compat\u00edvel com a minha m\u00e1quina antes de eu fazer o pedido. O envio levou 3 semanas para a Col\u00f4mbia, o que \u00e9 \u00f3timo. O pre\u00e7o \u00e9 muito competitivo para a qualidade que oferece. J\u00e1 recomendei o produto para outros agricultores da regi\u00e3o.\u201d<\/p>\n

Simon Partridge, Roads Maintenance, United Kingdom<\/strong>
\n\u201cTrabalho para uma autoridade rodovi\u00e1ria local em Lincolnshire e fazemos a manuten\u00e7\u00e3o de cerca de 600 km de bermas rurais todos os anos. Padronizamos o uso do RC-120 da CMN em nossa frota de ro\u00e7adeiras montadas em tratores nos \u00faltimos dois anos. Das 11 unidades que compramos at\u00e9 agora, nenhuma precisou de acionamento da garantia. A consist\u00eancia da qualidade entre os lotes foi algo que testamos especificamente antes de firmar um contrato de fornecimento em larga escala com essa empresa, e a CMN foi aprovada. A documenta\u00e7\u00e3o de exporta\u00e7\u00e3o e a certifica\u00e7\u00e3o CE tamb\u00e9m estavam completas e corretas na primeira solicita\u00e7\u00e3o, o que \u00e9 extremamente importante para o nosso processo de compras. Para qualquer autoridade local ou empreiteira que esteja procurando fornecedores confi\u00e1veis \u200b\u200bde caixas de engrenagens para ro\u00e7adeiras rotativas, eu recomendaria a CMN sem hesitar.\u201d<\/p>\n

Manuel Diaz Moreno, Sunflower and Cereal Stubble, Spain<\/strong>
\n\u201cTrabalho com ro\u00e7adeiras na Andaluzia h\u00e1 muitos anos e sempre busquei pe\u00e7as de qualidade a um pre\u00e7o razo\u00e1vel. A RC-120 da CMN Transmission \u00e9 exatamente isso. Instalamos em uma ro\u00e7adeira de 90 cavalos para limpar restolho de girassol e cereais ap\u00f3s a colheita. A rela\u00e7\u00e3o de 1:1,92 \u00e9 perfeita para esse trabalho. O acabamento da carca\u00e7a \u00e9 bom, as veda\u00e7\u00f5es v\u00eam bem ajustadas de f\u00e1brica e n\u00e3o houve vazamento de \u00f3leo nas primeiras 120 horas de uso. O servi\u00e7o t\u00e9cnico da CMN resolveu uma d\u00favida que t\u00ednhamos sobre o n\u00edvel correto de \u00f3leo em menos de 2 horas por e-mail. Muito satisfeito com a compra e com o atendimento recebido da equipe de vendas.\u201d<\/p>\n

Suresh Patel, Cortando talos de arroz e trigo, \u00cdndia<\/strong>
\n\u201cNa nossa fazenda, usamos essa caixa de engrenagens RC-120 em uma ro\u00e7adeira com um trator de 60 HP, que \u00e9 usada para cortar talos de arroz e capim. A instala\u00e7\u00e3o dessa caixa de engrenagens foi bastante f\u00e1cil, e a equipe da CMN respondeu a todas as nossas perguntas durante todo o processo. N\u00e3o tivemos nenhum problema nos primeiros tr\u00eas meses. Nossa caixa de engrenagens antiga quebrou em duas safras; considerando a qualidade desta nova, parece que vai durar mais. Eu recomendo a CMN. A embalagem tamb\u00e9m era muito boa, n\u00e3o houve danos e o prazo de entrega foi razo\u00e1vel.\u201d<\/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\/pt\/wp-json\/wp\/v2\/product\/7960","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/comments?post=7960"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/media\/7849"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/media?parent=7960"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/product_brand?post=7960"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/product_cat?post=7960"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/pt\/wp-json\/wp\/v2\/product_tag?post=7960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}