{"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\/fr\/produit\/rc-120-rotary-cutter-gearbox-replacement-for-omni-rc-120-gearbox\/","title":{"rendered":"Bo\u00eete de vitesses de remplacement pour broyeur rotatif 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

\"Bo\u00eete<\/p>\n

Sp\u00e9cifications du produit<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
Mod\u00e8le:<\/td>\nBo\u00eete de vitesses RC-120<\/td>\n<\/tr>\n
Puissance de sortie<\/td>\n51 \u00e0 161 ch<\/td>\n<\/tr>\n
Couple :<\/td>\n7 117 \u2013 19 950 lb-po.
\n(803 \u2013 2 252 Nm.)<\/td>\n<\/tr>\n
Proportions :<\/td>\n1.21:1, 1:1, 1:1.21, 1:1.46, 1:1.92<\/td>\n<\/tr>\n
Type d'\u00e9quipement :<\/td>\nBiseau<\/td>\n<\/tr>\n
Type de joint :<\/td>\nTriple l\u00e8vre \u00e0 ressort<\/td>\n<\/tr>\n
Type de roulement :<\/td>\nTapered Roller<\/td>\n<\/tr>\n
Capacit\u00e9 en huile :<\/td>\n60 oz.
\n(1,8 L)<\/td>\n<\/tr>\n
Poids:<\/td>\n109 livres
\n(49,9 kg)<\/td>\n<\/tr>\n
Applications :<\/td>\nTondeuses de finition
\nCoupeurs rotatifs
\nBroyeurs rotatifs<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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

\"Dimensions<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Mod\u00e8le<\/th>\nPoids maximal de l'unit\u00e9<\/th>\nCL \u00e0 travers Cap A<\/th>\nCL \u00e0 bride B<\/th>\nBride \u00e0 moyeu pilote C<\/th>\nDiam\u00e8tre pilote du moyeu H<\/th>\nDiam\u00e8tre de la bride D1<\/th>\nConfiguration des trous de boulons E1<\/th>\nTrous de fixation F1<\/th>\nBride carr\u00e9e taille D2<\/th>\nEntraxe des trous de fixation E2<\/th>\nTrous de fixation F2<\/th>\n<\/tr>\n
kg<\/th>\nkg<\/th>\ndans<\/th>\nmm<\/th>\ndans<\/th>\nmm<\/th>\ndans<\/th>\nmm<\/th>\ndans<\/th>\nmm<\/th>\ndans<\/th>\nmm<\/th>\ndans<\/th>\nmm<\/th>\ndans<\/th>\nmm<\/th>\ndans<\/th>\nmm<\/th>\ndans<\/th>\nmm<\/th>\ndans<\/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 bo\u00eete de vitesses RC-120 se connecte directement \u00e0 la prise de force (PDF) du tracteur et prend en charge les vitesses d'entr\u00e9e standard de 540 tr\/min et de 1\u00a0000 tr\/min. Son arbre d'entr\u00e9e cannel\u00e9 accepte les raccords rapides, permettant une installation et un d\u00e9montage rapides sur le terrain, sans outillage sp\u00e9cifique. Cette large compatibilit\u00e9 avec les prises de force permet d'associer la bo\u00eete de vitesses \u00e0 des tracteurs utilitaires compacts, des tracteurs de moyenne cylindr\u00e9e pour cultures en rangs et de gros \u00e9quipements agricoles 4x4, sans n\u00e9cessiter d'arbres adaptateurs ni de modifications sur mesure.<\/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. Protection contre les surcharges
\nLa RC-120 est con\u00e7ue pour recevoir, en option, un embrayage \u00e0 roue libre ou un syst\u00e8me de protection contre les surcharges par boulon de cisaillement sur l'arbre d'entr\u00e9e. Lorsque les lames de coupe heurtent un obstacle immobile \u00e0 pleine vitesse, le dispositif de protection contre les surcharges se d\u00e9sengage ou se cisaille avant qu'un couple excessif ne soit transmis par le train d'engrenages coniques, prot\u00e9geant ainsi les composants internes de la bo\u00eete de vitesses et la prise de force du tracteur. Ce m\u00e9canisme de s\u00e9curit\u00e9 int\u00e9gr\u00e9 est particuli\u00e8rement important lors de travaux dans des zones comportant des d\u00e9bris enfouis, des souches d'arbres dissimul\u00e9es ou des affleurements rocheux, o\u00f9 un blocage soudain des lames est impr\u00e9visible.<\/p>\n

\"Bo\u00eete<\/p>\n

Principe de fonctionnement<\/h2>\n

Le r\u00e9ducteur RC-120 constitue l'\u00e9l\u00e9ment central de transmission de puissance de toute d\u00e9broussailleuse rotative, tondeuse de finition ou broyeur rotatif. Son principe de fonctionnement repose sur la prise de force du tracteur, qui fournit l'\u00e9nergie de rotation \u00e0 540 ou 1\u00a0000 tr\/min selon la norme et la vitesse de la prise de force du tracteur. Cette entr\u00e9e horizontale de rotation p\u00e9n\u00e8tre dans le r\u00e9ducteur par l'arbre d'entr\u00e9e en acier alli\u00e9 tremp\u00e9, support\u00e9 \u00e0 ses deux extr\u00e9mit\u00e9s par des roulements \u00e0 rouleaux coniques de pr\u00e9cision. Ces roulements supportent les charges radiales dues \u00e0 l'engr\u00e8nement et les charges axiales g\u00e9n\u00e9r\u00e9es lors des changements de direction et des variations de charge.<\/p>\n

\u00c0 l'int\u00e9rieur du carter en fonte ductile, l'arbre d'entr\u00e9e entra\u00eene l'engrenage conique primaire. Cet engrenage conique est l'\u00e9l\u00e9ment central du fonctionnement de la bo\u00eete de vitesses agricole\u00a0: il d\u00e9vie l'entr\u00e9e de la prise de force horizontale de 90 degr\u00e9s tout en ajustant le rapport de vitesse et de couple entre l'entr\u00e9e et la sortie. Avec des rapports de r\u00e9duction \u00e9lev\u00e9s, comme 1:1,92, l'arbre de sortie tourne beaucoup plus vite que l'arbre d'entr\u00e9e, ce qui g\u00e9n\u00e8re la vitesse de pointe de lame \u00e9lev\u00e9e n\u00e9cessaire \u00e0 une coupe nette de l'herbe sur une tondeuse de finition. Avec des rapports de r\u00e9duction plus faibles, comme 1,21:1, les engrenages coniques augmentent le couple de sortie par rapport au couple d'entr\u00e9e, offrant ainsi \u00e0 la bo\u00eete de vitesses de la d\u00e9broussailleuse rotative l'avantage m\u00e9canique n\u00e9cessaire pour venir \u00e0 bout des broussailles \u00e9paisses, des tiges ligneuses et de la v\u00e9g\u00e9tation humide dense sans caler.<\/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 bo\u00eete de vitesses pour coupeuse rotative<\/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 configuration multi-vitesses du RC-120 favorise \u00e9galement l'adaptabilit\u00e9 au terrain en permettant aux op\u00e9rateurs de s\u00e9lectionner un rapport de bo\u00eete de vitesses de coupe rotative adapt\u00e9 aux conditions sp\u00e9cifiques du terrain rencontr\u00e9es\u00a0: les pentes abruptes et les zones humides b\u00e9n\u00e9ficient de rapports de couple plus \u00e9lev\u00e9s, tandis que les champs plats et am\u00e9nag\u00e9s sont mieux servis par des rapports de vitesse de lame plus rapides qui produisent une action de coupe plus fine.<\/p>\n

\"Bo\u00eete<\/p>\n

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

tonte de l'herbe et broyage de la paille<\/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

D\u00e9broussaillage et d\u00e9broussaillage<\/h3>\n

Ce broyeur rotatif offre le couple \u00e9lev\u00e9 n\u00e9cessaire pour couper efficacement les broussailles ligneuses denses, les ronces et les jeunes arbres en bordure de vergers, de bois et de cl\u00f4tures. Son engrenage conique robuste et son carter lourd absorbent l'\u00e9nergie des impacts r\u00e9p\u00e9t\u00e9s sur les tiges ligneuses denses tout au long de la journ\u00e9e, sans fatigue des dents ni rupture du carter. C'est pourquoi ce broyeur est le choix des professionnels pour les travaux de d\u00e9broussaillage.<\/p>\n<\/div>\n

\n

Pr\u00e9paration des terres agricoles et traitement des chaumes<\/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

Gestion des vergers et des vignobles<\/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

Contr\u00f4le de la v\u00e9g\u00e9tation en bordure de route et sur les emprises<\/h3>\n

Les services des routes, les programmes d'entretien des emprises de r\u00e9seaux et de pipelines font appel \u00e0 des faucheuses rotatives pour une tonte saisonni\u00e8re r\u00e9guli\u00e8re. La puissance nominale de la RC-120, de 51 \u00e0 161 ch, couvre tous les besoins, des faucheuses compactes mont\u00e9es sur tracteur aux grandes unit\u00e9s \u00e0 bras articul\u00e9 utilis\u00e9es pour la tonte \u00e0 grande vitesse sur les autoroutes, o\u00f9 un couple de sortie constant, quelle que soit l'\u00e9paisseur de l'herbe, est essentiel pour un fonctionnement s\u00fbr et efficace.<\/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

Les \u00e9leveurs utilisent des faucheuses rotatives avec la bo\u00eete de vitesses RC-120 pour r\u00e9duire la pression des adventices et favoriser la repousse de l'herbe entre les p\u00e2turages. La coupe de la v\u00e9g\u00e9tation mature \u00e0 la hauteur ad\u00e9quate stimule le tallage et la propagation lat\u00e9rale des esp\u00e8ces fourrag\u00e8res recherch\u00e9es, am\u00e9liorant ainsi la productivit\u00e9 des p\u00e2turages \u00e0 long terme. La gamme de puissance de la bo\u00eete de vitesses (75 et 100 CV) est adapt\u00e9e aux tracteurs les plus couramment utilis\u00e9s dans les exploitations agricoles pour ce type de travaux.<\/p>\n<\/div>\n

\n

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

Les entreprises de d\u00e9frichage travaillant sur des terrains \u00e0 forte densit\u00e9 de jeunes arbres utilisent des broyeurs rotatifs robustes associ\u00e9s au r\u00e9ducteur RC-120 pour abattre et broyer de jeunes arbres jusqu'\u00e0 plusieurs centim\u00e8tres de diam\u00e8tre. Le couple maximal de 2\u00a0252 Nm du r\u00e9ducteur fournit la force de coupe n\u00e9cessaire pour traverser efficacement les mat\u00e9riaux ligneux denses, tandis que le carter en fonte ductile assure la rigidit\u00e9 structurelle requise pour absorber les chocs r\u00e9p\u00e9t\u00e9s et puissants de la lame sans se fissurer ni se d\u00e9former, m\u00eame en cas d'utilisation commerciale intensive.<\/p>\n<\/div>\n

\"Applications<\/p>\n

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

1. Carter de bo\u00eete de vitesses
\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. Engrenages coniques
\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. Arbre d'entr\u00e9e
\nL'arbre se connecte directement \u00e0 la prise de force du tracteur. Fabriqu\u00e9 en acier alli\u00e9 c\u00e9ment\u00e9 pour une r\u00e9sistance maximale \u00e0 la torsion, il re\u00e7oit la puissance de rotation de l'arbre de transmission de la prise de force de l'outil et la transmet \u00e0 l'engrenage. Les configurations de cannelures standard, notamment les six cannelures de 1-3\/8 pouce et de 1-3\/4 pouce, permettent au RC-120 de s'adapter \u00e0 une large gamme de tracteurs sans adaptation ni mat\u00e9riel suppl\u00e9mentaire.<\/p>\n

4. Arbre de sortie
\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. Roulements
\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. Joints d'huile
\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

\"Pi\u00e8ces<\/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

\"Bo\u00eete<\/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>\u00a0V\u00e9rifiez et corrigez d'abord le niveau d'huile. Si le bruit persiste, retirez les couvercles du carter et inspectez les surfaces des dents d'engrenage pour d\u00e9tecter toute piq\u00fbre, \u00e9caillage ou entaille. Ajustez le jeu des engrenages selon les sp\u00e9cifications du fabricant. Remplacez les engrenages us\u00e9s lors de la r\u00e9vision du r\u00e9ducteur de la fraiseuse rotative si des dommages aux dents sont confirm\u00e9s lors de l'inspection.<\/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

Surchauffe pendant le fonctionnement<\/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>\u00a0Mesurez le jeu axial de l'arbre par rapport aux tol\u00e9rances du fabricant. Ajustez la pr\u00e9charge des roulements si elle est dans la plage de r\u00e9glage. Remplacez les roulements pr\u00e9sentant des piq\u00fbres, une d\u00e9coloration ou une rugosit\u00e9 sur les surfaces de roulement. V\u00e9rifiez la rectitude de l'arbre. Des vibrations excessives transmettent des forces dommageables \u00e0 la transmission de la prise de force du tracteur si elles ne sont pas corrig\u00e9es rapidement.<\/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

\"Bo\u00eete<\/p>\n

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

Le r\u00e9ducteur de la tondeuse rotative et l'arbre de prise de force forment ensemble la cha\u00eene de transmission de la puissance m\u00e9canique entre le moteur du tracteur et les lames de coupe situ\u00e9es sous le plateau de coupe. Comprendre ce fonctionnement est essentiel pour toute personne effectuant le choix, l'installation ou l'entretien de ces composants, qu'il s'agisse d'un r\u00e9ducteur de 40 ch pour une tondeuse rotative destin\u00e9e \u00e0 un tracteur compact ou d'un r\u00e9ducteur de 100 ch pour une exploitation commerciale de grande envergure.<\/p>\n

L'arbre de prise de force (PDF) est un arbre de transmission t\u00e9lescopique muni de joints universels \u00e0 chaque extr\u00e9mit\u00e9. Il relie la bride de sortie de la PDF arri\u00e8re du tracteur \u00e0 l'arbre d'entr\u00e9e de la bo\u00eete de vitesses. Les normes relatives aux PDF des tracteurs imposent une vitesse de rotation de 540 tr\/min (g\u00e9n\u00e9ralement sur les tracteurs de moins de 50 ch) ou de 1\u00a0000 tr\/min (plus fr\u00e9quente sur les tracteurs de forte puissance), dans le sens sp\u00e9cifi\u00e9 par le constructeur. L'arbre de PDF est prot\u00e9g\u00e9 par un carter de s\u00e9curit\u00e9 en plastique qui emp\u00eache tout contact avec les organes rotatifs pendant le fonctionnement. Le carter et l'arbre lui-m\u00eame doivent \u00eatre correctement entretenus et adapt\u00e9s au couple requis par l'outil.<\/p>\n

Le r\u00e9ducteur de la tondeuse rotative est reli\u00e9 directement \u00e0 la prise de force (PDF) du tracteur, sur un axe vertical, \u00e0 la barre porte-lames. Ce r\u00e9ducteur et la PDF transmettent la puissance de la prise de force du tracteur pour faire tourner les lames de la tondeuse sous le plateau de coupe. Le r\u00e9ducteur encaisse les chocs importants lorsque les lames, en mouvement, heurtent des broussailles denses, des rochers ou de petits arbres \u00e0 pleine vitesse. Ces chocs g\u00e9n\u00e8rent des pics de couple soudains, souvent bien sup\u00e9rieurs au couple de fonctionnement moyen. Le carter du r\u00e9ducteur, la g\u00e9om\u00e9trie des dents d'engrenage et le choix des roulements sont sp\u00e9cifiquement con\u00e7us pour absorber et dissiper ces pics sans d\u00e9faillance.<\/p>\n

La longueur de l'arbre de prise de force (PDF) est essentielle pour une transmission de puissance s\u00fbre et efficace. Si l'arbre est trop court, les sections t\u00e9lescopiques peuvent se replier compl\u00e8tement lors du relevage ou de l'abaissement du relevage trois points de l'outil, ce qui peut entra\u00eener le d\u00e9sengagement ou la rupture de l'arbre de PDF. S'il est trop long, l'arbre peut buter en position t\u00e9lescopique, emp\u00eachant ainsi le relevage complet. La longueur correcte de l'arbre est d\u00e9termin\u00e9e en mesurant ses dimensions comprim\u00e9e et d\u00e9ploy\u00e9e pour la combinaison tracteur-outil sp\u00e9cifique et en v\u00e9rifiant qu'il existe un chevauchement suffisant dans les deux positions. La plupart des fabricants d'outils pr\u00e9conisent un chevauchement minimal de l'arbre d'au moins un tiers de sa longueur comprim\u00e9e.<\/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 protection contre les surcharges entre l'arbre de prise de force et l'entr\u00e9e de la bo\u00eete de vitesses est assur\u00e9e soit par un boulon de cisaillement mont\u00e9 sur l'arbre d'entr\u00e9e de la bo\u00eete de vitesses, soit par un embrayage \u00e0 friction int\u00e9gr\u00e9 \u00e0 l'arbre de transmission de la prise de force. Le boulon de cisaillement utilise un boulon en acier \u00e0 faible r\u00e9sistance qui se rompt \u00e0 un couple d\u00e9fini, interrompant instantan\u00e9ment la transmission de puissance. L'embrayage \u00e0 friction permet \u00e0 la transmission de patiner \u00e0 une limite de couple pr\u00e9d\u00e9finie, assurant une protection continue sans n\u00e9cessiter le remplacement du boulon apr\u00e8s chaque incident. CMN Transmission recommande d'utiliser syst\u00e9matiquement un dispositif de protection contre les surcharges appropri\u00e9 et de ne jamais remplacer le boulon de cisaillement par un mod\u00e8le plus r\u00e9sistant, car cela d\u00e9place le point de d\u00e9faillance du dispositif sacrificiel vers les composants internes de la bo\u00eete de vitesses ou l'arbre de prise de force du tracteur.<\/p>\n

La v\u00e9rification finale des sp\u00e9cifications critiques consiste \u00e0 s'assurer que le couple nominal de l'arbre de prise de force correspond au couple maximal admissible de la bo\u00eete de vitesses. Lors du choix des pi\u00e8ces de la bo\u00eete de vitesses d'une faucheuse rotative, notamment un arbre de prise de force de remplacement, v\u00e9rifiez que la capacit\u00e9 de couple indiqu\u00e9e de l'arbre est \u00e9gale ou sup\u00e9rieure au couple maximal de sortie du RC-120 au rapport de transmission s\u00e9lectionn\u00e9. L'utilisation d'un arbre de prise de force sous-dimensionn\u00e9 sur une bo\u00eete de vitesses de faucheuse rotative de 60 ou 75 CV est une cause fr\u00e9quente de rupture de l'arbre, mettant en danger la machine et les op\u00e9rateurs lors des travaux aux champs.<\/p>\n\n\n\n
\"Bo\u00eete<\/td>\n\"Arbre<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Pourquoi choisir les r\u00e9ducteurs pour fraises rotatives 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 gamme de produits CMN couvre l'ensemble des applications de r\u00e9ducteurs agricoles\u00a0: r\u00e9ducteurs pour broyeurs rotatifs, fraises rotatives, m\u00e9langeuses d'aliments, faucheuses rotatives, \u00e9pandeurs d'engrais, broyeurs \u00e0 fl\u00e9aux, tari\u00e8res, presses \u00e0 balles rondes et carr\u00e9es, faucheuses \u00e0 disques, syst\u00e8mes d'irrigation \u00e0 pivot central, entra\u00eenements hydrauliques, ensileuses, pulv\u00e9risateurs arboricoles, andaineurs rotatifs, moissonneuses-batteuses, syst\u00e8mes de stockage et de transport des c\u00e9r\u00e9ales, cueilleuses \u00e0 ma\u00efs, barres de coupe, distributeurs d'aliments pour volailles et r\u00e9ducteurs agricoles sur mesure, r\u00e9pondant \u00e0 pr\u00e8s d'un millier de sp\u00e9cifications. Ces produits \u00e9quipent des machines de r\u00e9colte des c\u00e9r\u00e9ales, de fourrage, des faucheuses, des presses \u00e0 balles, des andaineurs, des fraises rotatives, des \u00e9pandeurs d'engrais, des pulv\u00e9risateurs, des m\u00e9langeuses d'aliments, des ensileuses et des moissonneuses-batteuses dans le monde entier.<\/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

\"Fabricants<\/p>\n

Foire aux questions<\/h2>\n

Q: What oil type and how much oil does the RC-120 rotary cutter gearbox require?<\/strong>
\nR : La bo\u00eete de vitesses RC-120 a une capacit\u00e9 d'huile de 1,8 litre (60 oz). La plupart des bo\u00eetes de vitesses de fraises rotatives utilisent une huile SAE 90 ou SAE 140, bien que certains fabricants recommandent une huile multigrade comme la 80W-90. Consultez toujours les sp\u00e9cifications du fabricant et \u00e9vitez de m\u00e9langer diff\u00e9rents types d'huile. Maintenir un niveau d'huile correct est essentiel pour pr\u00e9venir la surchauffe et l'usure pr\u00e9matur\u00e9e. V\u00e9rifiez le niveau d'huile avant chaque utilisation et vidangez l'huile apr\u00e8s les 25 premi\u00e8res heures d'utilisation d'un appareil neuf, puis toutes les 100 \u00e0 200 heures.<\/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 : Le rapport de transmission d'une faucheuse rotative d\u00e9crit la relation entre la vitesse de l'arbre d'entr\u00e9e (prise de force du tracteur) et la vitesse de l'arbre de sortie (entra\u00eenant la lame). Un rapport de 1:1 signifie que la sortie tourne \u00e0 la m\u00eame vitesse que l'entr\u00e9e. Un rapport de 1:1,92 signifie que la sortie tourne 1,92 fois plus vite que l'entr\u00e9e, offrant une vitesse de pointe de lame plus \u00e9lev\u00e9e, adapt\u00e9e aux herbes l\u00e9g\u00e8res et aux applications de finition. Un rapport de 1,21:1 permet une r\u00e9duction de vitesse et une augmentation du couple, pr\u00e9f\u00e9rable pour les broussailles denses, la v\u00e9g\u00e9tation humide ou les terrains escarp\u00e9s. Choisissez le rapport qui correspond le mieux \u00e0 la vitesse de la prise de force de votre tracteur et \u00e0 l'application de coupe pr\u00e9vue.<\/p>\n

Q : Comment savoir si le r\u00e9ducteur de ma fraiseuse rotative doit \u00eatre r\u00e9par\u00e9 ou remplac\u00e9 ?<\/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

\"Bo\u00eete<\/p>\n

Avis clients<\/h2>\n

Travis Holloway, Pasture Management, United States<\/strong>
\nJe poss\u00e8de un tracteur John Deere de 90 ch qui travaille sur environ 80 hectares de p\u00e2turages et de berges de ruisseaux. La bo\u00eete de vitesses d'origine de ma d\u00e9broussailleuse Rhino a rendu l'\u00e2me apr\u00e8s trois saisons d'utilisation intensive. J'ai trouv\u00e9 cette bo\u00eete de vitesses de remplacement RC-120 chez CMN et, honn\u00eatement, je ne savais pas trop \u00e0 quoi m'attendre d'une pi\u00e8ce adaptable \u00e0 ce prix-l\u00e0. Eh bien, je l'ai install\u00e9e en une heure environ, en utilisant le m\u00eame entraxe de fixation\u00a0: pas de per\u00e7age, pas d'adaptateurs, rien. Je l'utilise intensivement depuis six mois maintenant, dans des herbes hautes et des zones broussailleuses en bordure de ruisseaux, et aucun probl\u00e8me. L'huile est propre, aucune fuite, aucun bruit suspect. Vraiment impressionn\u00e9. J'en commanderai une autre le moment venu.<\/p>\n

Derek Fontaine, Vegetation Management, Canada<\/strong>
\n\u00ab Nous avons un contrat d'entretien des bords de route en Ontario et nous usons nos bo\u00eetes de vitesses plus rapidement que la plupart des entreprises. Nous avons essay\u00e9 la RC-120 de CMN il y a environ un an, suite \u00e0 la recommandation d'un autre entrepreneur. Deux de nos machines fonctionnent maintenant avec cette bo\u00eete de remplacement CMN depuis environ 350 heures chacune. Les joints sont toujours \u00e9tanches, il n'y a aucune fuite d'huile et les deux fonctionnent au rapport de 1:1,46, ce qui convient parfaitement \u00e0 notre Kubota de 100 ch pour l'entretien des herbes mixtes et des broussailles l\u00e9g\u00e8res le long des accotements. L'emballage en provenance de Cor\u00e9e \u00e9tait \u00e9galement excellent\u00a0; aucun dommage pendant le transport, contrairement \u00e0 ce qui s'est pass\u00e9 avec d'autres fournisseurs. Le service client a r\u00e9pondu rapidement lorsque j'avais une question concernant le choix du rapport. Un produit et un fournisseur vraiment fiables. \u00bb<\/p>\n

Rodrigo Alves Ferreira, Sugar Cane Operations, Brazil<\/strong>
\n\u00ab J'ai achet\u00e9 ce produit pour mon exploitation de canne \u00e0 sucre dans l'\u00c9tat de S\u00e3o Paulo. Nous l'utilisons sur un tracteur de 75 CV pour broyer les r\u00e9sidus de canne apr\u00e8s la r\u00e9colte et il supporte parfaitement la charge. Le rapport de 1:1,21 nous fournit le couple n\u00e9cessaire sans faire peiner le tracteur. La livraison au Br\u00e9sil a pris environ trois semaines, ce qui est normal pour les importations, et le passage en douane s'est fait sans probl\u00e8me. La seule raison pour laquelle je n'ai pas attribu\u00e9 cinq \u00e9toiles est que j'ai d\u00fb me procurer l'huile de transmission localement, car elle n'\u00e9tait pas fournie. C'est courant, mais il est important de le mentionner. Pour le reste, cet achat a \u00e9t\u00e9 parfait et je le rach\u00e8terais sans h\u00e9siter. L'\u00e9quipe de CMN a r\u00e9pondu \u00e0 mes questions avant-vente concernant les dimensions de l'arbre de mani\u00e8re tr\u00e8s claire et rapide. \u00bb<\/p>\n

Klaus-Dieter Brandt, Farm Machinery, Germany<\/strong>
\nNous utilisons la bo\u00eete de vitesses RC-120 sur notre broyeur \u00e0 fl\u00e9aux avec un tracteur de 120 ch, principalement pour le broyage des bordures de champs et le d\u00e9broussaillage des haies. C\u00f4t\u00e9 qualit\u00e9, la bo\u00eete de vitesses est tr\u00e8s robuste\u00a0; le carter en fonte nodulaire est bien usin\u00e9 et les joints sont parfaitement ajust\u00e9s. Aucune fuite d'huile apr\u00e8s la premi\u00e8re saison, aucun bruit suspect, rien \u00e0 signaler. J'avais initialement des doutes concernant le fabricant cor\u00e9en, mais CMN a largement d\u00e9pass\u00e9 mes attentes. La communication en anglais a \u00e9t\u00e9 simple et efficace, et la livraison en Allemagne a pris 12 jours ouvrables via DHL Express. Je la recommande vivement \u00e0 tous ceux qui recherchent une bo\u00eete de vitesses de remplacement fiable.<\/p>\n

Brendan Carrick, Pasture Maintenance, Australia<\/strong>
\n\u00ab Je g\u00e8re environ 400 hectares de p\u00e2turages ovins en Nouvelle-Galles du Sud, et l'entretien est constant. La bo\u00eete de vitesses d'origine de ma d\u00e9broussailleuse McConnel m'a l\u00e2ch\u00e9 en pleine saison, au moment o\u00f9 j'en avais le plus besoin. CMN avait la RC-120 imm\u00e9diatement disponible, et leur service client a confirm\u00e9 que les sp\u00e9cifications correspondaient \u00e0 mon appareil avant m\u00eame que je passe commande. Elle est arriv\u00e9e en 10 jours ouvrables, plus vite que pr\u00e9vu pour une livraison en r\u00e9gion rurale de Nouvelle-Galles du Sud. Le montage a pris moins d'une heure. C'\u00e9tait il y a 8 mois, et j'ai probablement effectu\u00e9 180 heures d'utilisation depuis, dans toutes sortes de p\u00e2turages, du kikuyu sec au seigle humide. L'engagement des vitesses est fluide, il n'y a aucun jeu dans l'arbre de sortie, et les joints r\u00e9sistent parfaitement aux conditions poussi\u00e9reuses des p\u00e2turages. \u00bb<\/p>\n

Hernan Gomez Vargas, Sugar Cane Farm, Colombia<\/strong>
\n\u00ab J'ai achet\u00e9 le RC-120 pour remplacer le r\u00e9ducteur d'origine de ma faucheuse rotative utilis\u00e9e dans notre exploitation de canne \u00e0 sucre \u00e0 Tolima. Nous l'utilisons \u00e0 plein r\u00e9gime depuis quatre mois sans aucun probl\u00e8me. Nous l'avons install\u00e9 nous-m\u00eames en suivant les instructions que CMN nous a envoy\u00e9es par courriel. J'ai particuli\u00e8rement appr\u00e9ci\u00e9 la r\u00e9activit\u00e9 de l'\u00e9quipe commerciale, qui a r\u00e9pondu rapidement \u00e0 mes questions par courriel et a confirm\u00e9 la compatibilit\u00e9 du mod\u00e8le avec ma machine avant m\u00eame que je passe commande. La livraison en Colombie a pris trois semaines, ce qui me convient parfaitement. Le prix est tr\u00e8s comp\u00e9titif compte tenu de la qualit\u00e9. J'ai d\u00e9j\u00e0 recommand\u00e9 ce produit \u00e0 d'autres agriculteurs de la r\u00e9gion. \u00bb<\/p>\n

Simon Partridge, Roads Maintenance, United Kingdom<\/strong>
\n\u00ab Je travaille pour le service des routes d'une collectivit\u00e9 locale du Lincolnshire et nous entretenons environ 600 km d'accotements ruraux chaque ann\u00e9e. Depuis deux ans, nous utilisons le r\u00e9ducteur RC-120 de CMN pour notre flotte de broyeurs mont\u00e9s sur tracteur. Sur les 11 unit\u00e9s achet\u00e9es \u00e0 ce jour, aucune n'a n\u00e9cessit\u00e9 d'intervention sous garantie. La constance de la qualit\u00e9 entre les lots \u00e9tait un crit\u00e8re essentiel que nous avons test\u00e9 avant de nous engager aupr\u00e8s de ce fournisseur \u00e0 grande \u00e9chelle, et CMN a pass\u00e9 le test avec succ\u00e8s. Leurs documents d'exportation et de conformit\u00e9 CE \u00e9taient \u00e9galement complets et corrects d\u00e8s la premi\u00e8re demande, ce qui est primordial pour notre processus d'achat. Pour toute collectivit\u00e9 locale ou entreprise de travaux publics \u00e0 la recherche d'un fournisseur fiable de r\u00e9ducteurs pour broyeurs rotatifs, je recommande CMN sans h\u00e9siter. \u00bb<\/p>\n

Manuel Diaz Moreno, Sunflower and Cereal Stubble, Spain<\/strong>
\n\u00ab Je travaille avec des faucheuses rotatives en Andalousie depuis de nombreuses ann\u00e9es et j'ai toujours recherch\u00e9 des pi\u00e8ces de qualit\u00e9 \u00e0 un prix raisonnable. La RC-120 de CMN Transmission r\u00e9pond parfaitement \u00e0 ces crit\u00e8res. Nous l'avons mont\u00e9e sur une faucheuse de 90 chevaux pour le d\u00e9chaumage des tournesols et des c\u00e9r\u00e9ales apr\u00e8s la r\u00e9colte. Le rapport de 1:1,92 est id\u00e9al pour cette application. La finition du corps est impeccable, les joints sont bien r\u00e9gl\u00e9s d'usine et aucune fuite d'huile n'a \u00e9t\u00e9 constat\u00e9e durant les 120 premi\u00e8res heures d'utilisation. Le service technique de CMN a r\u00e9solu notre question concernant le niveau d'huile en moins de deux heures par e-mail. Je suis tr\u00e8s satisfait de cet achat et du service client. \u00bb<\/p>\n

Suresh Patel, Coupe de riz et de tiges de bl\u00e9, Inde<\/strong>
\n\u00ab\u00a0Sur notre exploitation, nous utilisons cette bo\u00eete de vitesses RC-120 sur une faucheuse rotative coupl\u00e9e \u00e0 un tracteur de 60 CV, pour la coupe des chaumes de riz et de l'herbe. L'installation de cette bo\u00eete de vitesses a \u00e9t\u00e9 tr\u00e8s simple et l'\u00e9quipe CMN a r\u00e9pondu \u00e0 toutes nos questions tout au long du processus. Aucun probl\u00e8me n'a \u00e9t\u00e9 rencontr\u00e9 pendant les trois premiers mois. Notre ancienne bo\u00eete de vitesses a rendu l'\u00e2me apr\u00e8s seulement deux saisons\u00a0; au vu de la qualit\u00e9 de celle-ci, elle semble bien plus durable. Je recommande CMN. L'emballage \u00e9tait impeccable, aucun dommage n'a \u00e9t\u00e9 constat\u00e9 et le d\u00e9lai de livraison \u00e9tait raisonnable.\u00a0\u00bb<\/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\/fr\/wp-json\/wp\/v2\/product\/7960","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/comments?post=7960"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/media\/7849"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/media?parent=7960"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/product_brand?post=7960"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/product_cat?post=7960"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/fr\/wp-json\/wp\/v2\/product_tag?post=7960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}