Hitachi EX400-3 EX400-5 Travel Gearbox 1st Planetary Carrier Spider With Sun Gear Assy For 1015505 2031016 3053098

This combined first‑stage planetary spider and sun gear assembly sits at the upstream transmission chain inside travel reduction final drive, built for heavy‑duty Hitachi EX400‑3 and EX400‑5 large crawler excavators. Frequent rock excavation, mass earth‑moving and cross‑site transfer over rough ground impose continuous high torque and impact shocks on this component. If this 1st‑stage planetary unit suffers damage, operators will face weak tractive force, track drift and noisy gearbox operation directly.

All tooth profiles, internal spline dimensions and mounting hole layouts strictly replicate original Hitachi engineering drawings. Three cross‑reference part numbers 1015505, 2031016 and 3053098 are fully interchangeable. Field replacement can be accomplished with zero secondary machining. It helps maintenance teams cut down machine stand‑still time, especially when official OEM parts face long supply delays for these older heavy‑duty excavator models.

1. Triple‑PN Compatible Assembly Custom‑Tailored for Hitachi EX400‑3 / EX400‑5 Final Drive

   Part numbers 1015505, 2031016 and 3053098 can serve as mutual substitutes during overhaul work. This carrier‑sun gear assembly is purpose‑built to match the inner structural layout of EX400‑3 and EX400‑5 travel reducer and cannot fit other Hitachi excavator series. Strict dimensional replication maintains proper gear meshing clearance, avoiding track offset movement, harsh internal grinding noise and accelerated component wear post‑installation.

2. Integral Forged Structure Enhances Survivability Under High‑Torque Working Conditions

   Numerous low‑cost aftermarket planetary carriers tend to develop spider fractures or sun gear tooth chipping under sustained heavy‑load mining operations. Our one‑body forging together with complete thermal‑treatment workflow greatly improves shock‑resistant capability. It maintains stable operating performance amid long‑duration continuous digging and high‑frequency site relocation.

3. Two‑Phase Pre‑Shipment Quality Audit Minimizes Unexpected On‑Site Breakdown Risks

   Each finished assembly undergoes two independent inspection workflows prior to factory release. Comprehensive dimension calibration verifies all mating tolerances. Simulated mine‑site heavy‑load test reproduces real‑world working stress to validate transmission reliability. Potential defective components are screened out internally, helping repair workshops and mine operators evade unplanned equipment downtime losses.

4. Cost‑Efficient Overhaul Solution for Heavy‑Machine Fleet Owners & Service Garages

   Genuine Hitachi planetary drive spare parts carry steep purchase costs and unstable supply cycles for these legacy large excavator models. This aftermarket assembly delivers load‑bearing performance and service life comparable to OEM standards at factory‑direct price levels, cutting recurring maintenance expenditure for enterprises operating multiple EX400‑3 / EX400‑5 units.

5. Flexible Multimodal Logistics Solutions for International Machinery Component Distributors

   Stock‑ready goods can be dispatched within 3 working days after payment confirmation. Air freight service caters to urgent breakdown orders from remote mining zones. Consolidated sea cargo and full‑container shipping options deliver cost‑saving bulk procurement solutions for distributors covering Africa, Southeast Asia, Middle East and Latin America markets.

Our facility holds over 10 years of accumulated expertise in R&D and mass‑production for excavator final‑drive planetary components. Travel gearbox planetary assemblies constitute our flagship product portfolio. Our closed‑loop production chain covers alloy steel forging, high‑precision gear processing, professional thermal treatment and finished‑product load‑simulation evaluation. Dedicated heavy‑load test benches replicate harsh mine and infrastructure‑site working conditions to continuously upgrade component anti‑shock property and long‑term service lifespan. Our planetary spare parts are exported across dozens of countries, establishing solid long‑term business partnerships with heavy‑machinery spare‑part dealers worldwide.