SANY SY285 SY308-5 Travel Gearbox 3rd Planetary Carrier Spider With Sun Gear Assy for Excavator Parts

This integrated third-stage planetary spider paired with matched sun gear serves as the final torque reduction core inside the travel final drive for SANY SY285 and SY308-5 crawler excavators, widely deployed for quarry mining, earthmoving, road reconstruction and river regulation projects across Africa, Southeast Asia and the Middle East construction markets.

Loed at the last reduction stage of the multi-stage travel gearbox, this planetary assembly bears peak torque loads during steep slope climbing, heavy hauling and continuous cyclic excavation work. Once the carrier support lugs develop fatigue cracks, sun gear teeth suffer pitting and spalling, or internal splines experience excessive abrasive wear, a series of typical failures will surface: sluggish track response, obvious travel speed inconsistency between left and right tracks, persistent metallic grinding noise and abnormal overheating of the travel motor. These unexpected breakdowns halt construction progress and create extra repair expenditure for fleet managers, engineering contractors and equipment rental operators.

Our assembly is machined strictly in compliance with SANY OEM drawing standards for gear tooth profile, spline fitting clearance and mounting hole layout. No cutting, drilling or reaming modifiion is required during travel reducer overhaul, supporting direct plug-and-play installation and greatly shortening machine downtime. As an economical aftermarket substitute for high-priced genuine SANY spare parts with unstable stock cycles, this unit maintains stable torque transmission performance at factory direct wholesale prices, fully matching the procurement demands of repair workshops, spare parts distributors and cross-border construction machinery suppliers.

1. 1:1 OEM dimensional repliion, exclusive fit for SANY SY285 & SY308-5 travel reducer, non-interchangeable with other excavator models

   This planetary assembly is custom-engineered to match the inner cavity geometry of the SY285 and SY308-5 travel gearbox and cannot be fitted onto other SANY variants such as SY305 or SY335. Accurate reproduction of original spline tolerance and gear meshing gap prevents transmission jitter, track deviation and accelerated wear of mating drive components after installation; no extra auxiliary fittings are needed during assembly.

2. One-piece die forging construction, superior shock resistance and extended fatigue life for continuous heavy-duty operation

   Many low-cost generic aftermarket planetary carriers are prone to fractured support lugs and collapsed gear teeth under round-the-clock heavy excavation loads. Our integral thick forging process paired with full-process constant-temperature heat treatment significantly boosts impact resistance and fatigue lifespan. It sustains consistent torque delivery during nonstop digging and short-distance site transfer, effectively reducing travel gearbox overhaul frequency for rental fleets and second-hand excavator operators.

3. Dual independent closed-loop inspection workflows to reduce economic losses caused by unplanned machine shutdown

   Every finished assembly undergoes two separate rigorous inspection sequences before factory dispatch. Full-range dimension calibration verifies all matching tolerances of gear surfaces and inner splines; simulated heavy-load torque aging test replies real-site working conditions to validate long-term transmission stability. Substandard semi-finished products are eliminated in advance, helping repair shops and project contractors lower operational risks from sudden equipment halt.

4. Cost-effective aftermarket alternative to imported genuine SANY spare parts to control routine maintenance expenditure

   Genuine SANY planetary transmission spare parts carry high procurement costs and fluctuating stock availability for SY285 and SY308-5, two popular medium-large crawler excavator models in overseas construction markets. Our aftermarket assembly delivers equivalent load-bearing capacity and service life as OEM components at factory wholesale pricing, substantially cutting annual equipment maintenance budgets for enterprises managing multiple SANY excavator units.

5. Flexible multi-channel global logistics for international construction machinery spare parts wholesalers

   In-stock items can be arranged for shipment within 3 working days once payment is confirmed. Air freight services er to urgent emergency repair orders from remote mountain and mining construction zones; consolidated bulk sea freight and full-container shipments offer cost-effective bulk procurement packages for distributors covering Southeast Asia, Africa, the Middle East and Central Asia.

Our manufacturing facility owns more than 15 years of specialized R&D and mass production experience for Chinese brand excavator travel motor planetary spare parts, with SANY medium and large series planetary carrier assemblies as our flagship product line. We operate a complete closed-loop production chain covering alloy steel die forging, 5-axis precision gear machining, constant-temperature professional heat treatment and finished heavy-load simulation testing. Self-developed impact torque test benches replie harsh quarry and road construction operating environments to continuously upgrade product shock resistance and extend service cycles. Our planetary gear spare parts are exported to over 50 countries and regions worldwide, establishing long-term stable strategic partnerships with global heavy machinery spare parts wholesalers.