SANY SY335 Travel Gearbox 1st Planetary Carrier Spider With Sun Gear Assy For Excavator Parts

This integrated first-stage planetary spider and matched sun gear assembly acts as the primary speed reduction component within the travel final drive of SANY SY335 crawler excavators, widely used for large-scale earthworks, stone mining, highway foundation construction and river dredging projects across overseas construction markets including Southeast Asia, Africa and the Middle East.

Installed at the initial reduction stage of the multi-stage travel gearbox, this planetary set bears the original input torque transferred from the travel motor, enduring frequent impact loads during start and stop operations, steep slope climbing and continuous heavy digging cycles. When carrier support lugs produce fatigue cracks, sun gear teeth suffer pitting, peeling or breakage, and internal connecting splines become severely worn, a range of typical faults will occur: slow travel response, obvious speed difference between left and right tracks, continuous metal friction noise and abnormal temperature rise inside the travel reducer. These unexpected failures disrupt construction schedules and bring additional maintenance costs for project contractors, equipment leasing companies and repair service teams.

Our assembly is manufactured strictly following SANY OEM drawing standards in terms of gear tooth profile, spline matching clearance and mounting hole layout. No cutting, drilling or reaming modifiion is required during the overhaul of the travel gearbox, enabling direct plug-and-play installation and greatly shortening equipment downtime. As an economical aftermarket replacement for high-priced original SANY spare parts with unstable supply cycles, this product delivers reliable torque transmission performance at factory direct wholesale prices, perfectly meeting the purchasing needs of maintenance workshops, spare parts dealers and cross-border construction machinery suppliers.

1. 1:1 OEM precise dimensional copying, exclusive fit for SANY SY335 travel reducer, non-interchangeable with other models

   This planetary assembly is customized according to the internal cavity structure of the SY335 travel gearbox and cannot be installed on other SANY models such as SY285 or SY305. The accurate restoration of the original spline tolerance and gear meshing gap avoids transmission jitter, track deviation and accelerated wear of matching transmission parts after installation, and no additional auxiliary accessories are needed during assembly.

2. Integral die forging forming, excellent shock resistance and fatigue life to adapt to long-time continuous heavy construction

   Many low-cost universal aftermarket planetary carriers are prone to fractured support lugs and collapsed gear teeth under all-day heavy excavation loads. Our integral thick forging process, combined with full-process constant temperature heat treatment, greatly improves impact resistance and fatigue life. It maintains stable torque transmission during non-stop excavation and short-distance site transfer, effectively reducing the overhaul frequency of travel gearboxes for rental fleets and second-hand excavator operators.

3. Dual independent closed-loop inspection processes to avoid economic losses caused by unplanned equipment shutdown

   Each finished assembly passes two independent strict inspection processes before leaving the factory. Full-range dimension calibration checks all matching tolerances of gear surfaces and internal splines; simulated heavy-load torque aging test reproduces actual working loads on site to verify long-term transmission stability. Unqualified semi-finished products are screened out in advance, helping repair shops and project contractors reduce the risk of sudden equipment shutdown.

4. Cost-effective aftermarket substitute for genuine imported SANY spare parts to control daily maintenance costs

   Genuine SANY planetary transmission spare parts have high procurement costs and unstable stock cycles for SY335, a mainstream medium-large excavator model widely circulated in overseas construction markets. Our aftermarket assembly achieves the same load-bearing capacity and service life as OEM products at factory wholesale prices, significantly reducing the annual equipment maintenance budget for enterprises with multiple SY335 excavators.

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

   In-stock products can be arranged for delivery within 3 working days after payment confirmation. Air freight services meet the urgent emergency repair needs of remote mountain and mining construction sites; consolidated bulk sea freight and full-container transportation provide economical bulk procurement plans for distributors covering Southeast Asia, Africa, the Middle East and Central Asia.

Our manufacturing plant has more than 15 years of professional R&D and mass production experience in travel motor planetary spare parts for Chinese brand excavators, with SANY medium and large series planetary carrier assemblies as the core flagship product. We run a complete closed-loop production chain including alloy steel die forging, 5-axis precision gear processing, constant temperature professional heat treatment and finished heavy-load simulation testing. Self-developed impact torque test benches simulate harsh quarry and road construction working conditions to continuously optimize product impact resistance and extend service life. Our planetary gear spare parts are exported to more than 50 countries and regions around the world, forming long-term stable strategic cooperative relations with global heavy machinery spare parts wholesalers.

Q1: Can this first-stage planetary carrier assembly fit other SANY excavator models except SY335?

A1: Cross-model matching is not supported. Different SANY excavator series adopt final drive assemblies with exclusive non-interchangeable structural dimensions and spline parameters. Please confirm the exact machine model before placing an order.

Q2: What travel gearbox faults can this assembly solve?

A2: It solves equipment failures caused by cracked carrier support lugs, severely worn or broken sun gear teeth, offset shaking tracks, continuous harsh internal gear grinding noise and insufficient walking power under heavy-load uphill excavation.

Q3: Is there a tiered volume discount policy for large bulk wholesale orders?

A3: Yes, we offer differentiated preferential prices according to the order quantity. We can arrange full-container sea transportation to reduce the overall international logistics cost for large batch procurement.

Q4: What anti-rust and shockproof packaging is used for long-distance ocean transportation?

A4: All metal surfaces are evenly coated with high-viscosity heavy-duty anti-rust grease. The whole assembly is wrapped with multi-layer thick waterproof and shockproof PE film, and then sealed in reinforced export plywood cases to prevent surface scratches, collision deformation and moisture corrosion during long-term overseas sea transportation.