Kato HD1250-7 Travel Gearbox 1st Planetary Carrier Spider With Sun Gear Assy For Excavator Parts

This integrated first-stage planetary carrier and sun gear assembly serves as the primary power input component inside the travel reduction gearbox, tailor-made exclusively for Kato HD1250-7 heavy crawler excavators. The HD1250-7 model is a mainstream Japanese heavy-duty machine favored by mining contractors and earthwork teams across Southeast Asia, Africa and the Middle East, frequently deployed in hard rock mining, mountain road excavation, large land leveling and river dredging works.

Positioned at the front inlet of the three-stage reduction system, this 1st planetary set directly bears the instantaneous impact torque released by the hydraulic travel motor during startup, steering and slope climbing. Once the carrier’s support ribs crack, sun gear teeth chip or internal splines suffer excessive wear, the excavator will display delayed walking response, obvious speed difference between left and right tracks, persistent sharp metallic grinding noise, and abnormal overheating of the travel motor housing, forcing construction suspension and causing economic losses.

Our product strictly replies Kato OEM dimensional standards for gear tooth profile, spline matching tolerance and mounting hole layout. No on-site cutting, drilling or reaming modifiion is required during overhaul, enabling fast direct replacement and minimizing machine downtime. Compared with expensive original Kato genuine spare parts with long import lead times, this aftermarket assembly delivers matching transmission performance at factory direct wholesale prices, ideal for repair workshops, equipment rental yards and cross-border spare parts distributors.

1. 1:1 OEM precise dimension repliion, exclusive fit for Kato HD1250-7 travel reducer without cross-model compatibility

   This planetary assembly is customized according to the internal cavity structure of HD1250-7 travel gearbox, and cannot be installed on other Kato models such as HD700-7 or HD1430. Accurate reproduction of original spline fit clearance and gear meshing gap avoids track deflection, unstable jitter during movement, abnormal internal friction noise and premature abrasion of matched transmission components after installation. It fully matches the original assembly structure without extra auxiliary parts.

2. Integral thick one-piece forging molding, outstanding shock and fatigue resistance for long-hour heavy-duty operation

   Low-cost generic aftermarket planetary carriers often suffer rib fracture and tooth collapse under non-stop heavy mining loads. Our integral thick die forging craft plus full-process constant-temperature heat treatment greatly upgrades anti-impact and anti-fatigue performance. It maintains stable torque transmission during continuous heavy excavation and long-distance cross-site transfer, effectively reducing the overhaul frequency of travel gearboxes for used excavator and rental fleet owners.

3. Double independent closed-loop inspection workflows to eliminate losses from unplanned equipment downtime

   Every finished assembly undergoes two separate strict inspection procedures before leaving the factory. Full-range dimension calibration verifies all matching tolerances of gear surfaces and inner splines; simulated hard rock mine heavy torque aging test replies extreme harsh working conditions to verify long-term transmission stability. All unqualified semi-finished products are screened out in advance, helping repair shops and mine operators cut financial risks caused by sudden machine shutdown.

4. Cost-effective aftermarket substitute for imported Kato original spare parts, controlling annual maintenance expenditure

   Genuine Kato original planetary transmission spare parts face high import tariffs and unstable supply cycles for HD1250-7, a widely circulated Japanese heavy excavator in overseas markets. Our aftermarket assembly achieves the same load-bearing capacity and service lifespan as OEM products at factory wholesale prices, greatly lowering the annual equipment maintenance budget for enterprises with multiple HD1250-7 units.

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

   All in-stock goods can be arranged for shipment within 3 working days after payment confirmation. Air freight channels er to urgent emergency repair orders from remote mountain mining areas; consolidated bulk sea freight and full-container shipments provide cost-saving bulk purchasing plans for distributors covering Southeast Asia, Africa, the Middle East and Central Asia.

Our manufacturing plant has over 15 years of professional R&D and mass production experience in Japanese brand excavator travel motor planetary spare parts, with Kato HD series planetary carrier assemblies as our core flagship product line. We own a complete closed-loop production chain covering alloy steel die forging, 5-axis precision gear machining, constant-temperature professional heat treatment and finished product heavy-load simulation testing. Self-developed heavy-torque test benches simulate severe quarry and mountain construction working conditions to continuously optimize product shock resistance and extend service cycles. Our planetary gear spare parts are exported to more than 50 countries and regions worldwide, establishing long-term stable strategic cooperative partnerships with global heavy machinery spare parts wholesalers.

Q1: Can this first-stage planetary carrier assembly fit other Kato excavator models besides HD1250-7?

A1: Cross-model matching is not supported. Different Kato excavator series adopt final drive assemblies with exclusive non-interchangeable structural dimensions and spline parameters. Please double-check your exact machine model before placing orders.

Q2: What travel gearbox faults can this assembly resolve?

A2: It fixes equipment failures triggered by cracked carrier support ribs, severely worn or fractured sun gear teeth, offset wobbling tracks, continuous harsh internal gear grinding noise and insufficient walking driving power output during heavy load climbing.

Q3: Are tiered volume discount policies available for large bulk wholesale orders?

A3: Yes, we provide differentiated preferential prices based on order quantity. We can coordinate full-container sea transportation to reduce overall international logistics costs for large-batch procurement.

Q4: What anti-rust and shockproof packaging is adopted 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, then sealed inside reinforced export plywood crates to prevent surface scratches, collision deformation and damp corrosion during prolonged overseas sea transit.