Travel Gearbox 2nd Planetary Carrier Spider With Sun Gear Assy for Deere 120D 120C Excavator Parts 1027076 308556 308569
This second-stage planetary spider and matched sun gear assembly functions as the intermediate reduction core within the travel final drive for Deere 120D 120C crawler excavators. Widely adopted in urban renovation, pipeline laying, landscaping and small-scale earthmoving projects, this component serves a large number of medium and small construction fleets, maintenance workshops and spare parts distributors across global emerging construction markets.
Installed in the middle reduction section of multi-stage travel gearbox, this planetary assembly bears continuous alternating torque loads during frequent start-stop travel, site relocation and gradient operation. Common damage modes include fatigue cracks on carrier lugs, pitting and breakage of sun gear teeth, as well as excessive abrasion of internal connecting splines. Once damaged, typical equipment symptoms appear: inconsistent travelling speed between left and right tracks, persistent abnormal grinding noise inside the reducer, weak climbing traction and abnormal overheating of the travel gearbox. Unexpected breakdowns delay project schedules and bring extra repair labor and part costs for equipment owners and contractors.
Our assembly is manufactured according to standard aftermarket specifications for gear tooth profile, spline fit clearance and overall mounting dimensions. No secondary cutting, drilling or modification is needed during travel reducer overhaul, supporting direct replacement and effectively shortening machine downtime. As an economical alternative to expensive original spare parts with long lead times, this assembly ensures stable torque transmission under factory wholesale pricing, meeting bulk procurement demands for cross-border machinery suppliers.
| Parameter | Standard Requirement |
|---|---|
| Main Raw Material | Die-forged alloy steel with uniform internal grain structure |
| Heat Treatment Craft | Carburizing quenching + low-temperature tempering to release internal residual stress |
| Surface Mechanical Performance | Hardened wear-resistant gear surface, high toughness carrier body to restrain crack expansion under cyclic torque impact |
| Assembly Composition | Reinforced 2nd planetary carrier spider + matched secondary sun gear |
| Precision Machining Technology | CNC gear grinding, full deburring and edge finishing to guarantee meshing precision |
| Structural Optimization Merit | Balanced load sharing design, suitable for long continuous operation in muddy and dusty construction sites |
| Related Part Numbers | 1027076, 308556, 308569 |
- Standard dimension matching, dedicated for Deere 120D 120C travel gearbox, not interchangeable with other excavator models
This planetary assembly is customized to fit the internal cavity size of 120D 120C travel reducer. It cannot be assembled onto other excavator models. Precise control over spline tolerance and gear meshing gap avoids transmission shaking, track deviation and accelerated wear of mating transmission components after installation, without requiring extra auxiliary fittings.
- Integral forging structure, improved impact resistance for frequent short-cycle construction tasks
Many low-cost universal planetary carriers suffer lug fracture and gear tooth collapse under frequent start-stop impact loads. Our integral forging process with standardized heat treatment enhances overall structural toughness and service cycle. It maintains stable power output during repeated moving and digging work, lowering the overall overhaul frequency of travel gearboxes for equipment rental fleets.
- Complete factory inspection process to reduce the risk of unplanned machine shutdown
Each finished assembly passes strict dimension inspection and load simulation testing before shipment. Non-conforming semi-finished products are eliminated in advance, preventing rework troubles for repair teams and economic losses caused by sudden equipment halt on construction sites.
- Cost-effective aftermarket solution to control routine maintenance budgets
Genuine original planetary spare parts usually carry high prices and unstable supply cycles. Our aftermarket assembly delivers equivalent load capacity and service life at factory direct price, helping operators with multiple excavators reduce annual maintenance expenditure.
- Flexible global logistics options for bulk wholesale buyers
In-stock goods can be arranged for shipment within 3 working days after payment confirmation. Air freight is available for urgent on-site emergency repair orders; consolidated sea freight and full-container shipping provide cost-saving solutions for long-term bulk distributors.
Our manufacturing workshop specializes in planetary gear spare parts for travel gearboxes of various excavator brands. We own a complete production chain covering alloy steel die forging, precision gear machining, professional heat treatment and finished product performance testing. Independent torque simulation test benches replicate real harsh working conditions to continuously optimize product wear resistance and impact resistance. Our planetary components are exported to multiple overseas regions, maintaining stable long-term cooperation with global construction machinery spare parts wholesalers.
A1: Cross-model compatibility is not supported. Different machine models adopt final drive assemblies with different structural sizes and spline parameters. Please verify your machine model and corresponding part numbers before placing orders.
A2: It can repair failures caused by cracked carrier lugs, damaged sun gear teeth, uneven track speed, internal metal grinding noise and insufficient traction when climbing slopes.
A3: Yes, we offer differentiated preferential prices based on purchase quantity. We can also arrange full-container sea transport to cut comprehensive logistics costs.
A4: Heavy-duty anti-rust grease is coated on all metal surfaces. The whole assembly is wrapped with waterproof and shockproof PE film, then packed into reinforced export plywood cases to avoid collision deformation and damp corrosion during long overseas transit.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.