Hitachi EX300-5 Travel Gearbox 2nd Planetary Carrier Spider With Sun Gear Assy

This integrated second‑stage planetary spider and sun gear assembly sits within the travel reduction final drive, designed for heavy‑duty Hitachi EX300‑5 crawler excavator. Frequent rock excavation, bulk earth‑moving and cross‑site transfer across rough terrain subject this transmission component to persistent high torque and impact shocks. Once the 2nd‑stage planetary unit gets damaged, operators will encounter insufficient travel power, uneven track movement, harsh gear knocking noise and final drive overheating.

All tooth profiles, internal spline sizes and mounting hole layouts strictly follow original Hitachi component specifications. Three cross‑reference part numbers 1022197, 3074989 and 3075002 are fully interchangeable. Direct field replacement is available without extra secondary machining. It helps maintenance teams cut equipment downtime, especially when genuine OEM stock runs short for these older large excavator units.

1. Multi‑PN Interchangeable Assembly Specially Built for Hitachi EX300‑5 Final Drive

   Part numbers 1022197, 3074989 and 3075002 can mutually substitute one another during final drive overhaul. This carrier‑sun gear assembly is purpose‑built to match the inner structural layout of EX300‑5 travel reducer and cannot fit other Hitachi excavator series. Strict dimensional duplication keeps proper gear meshing clearance, avoiding track deviation, jerky movement, harsh internal grinding noise and accelerated component wear after installation.

2. One‑piece Forged Structure Boosts Durability Under Continuous High‑Torque Work Conditions

   Many low‑cost aftermarket planetary carriers suffer spider fracture or sun gear tooth chipping under long‑time heavy‑load mining operations. Our complete built‑in forging plus full thermal‑treatment workflow greatly improves anti‑impact performance. It maintains stable running performance through long‑hour continuous digging and high‑frequency site relocation.

3. Two‑phase Pre‑shipment Quality Inspection Lowers Unexpected On‑site Failure Risks

   Every finished assembly passes two independent inspection flows before factory delivery. Comprehensive dimension calibration checks all mating tolerances. Simulated mine‑site heavy‑load test reproduces real‑world working stress to confirm transmission reliability. Potentially defective parts are screened out internally, assisting repair shops and mine operators to avoid unplanned equipment stand‑still losses.

4. Cost‑effective Overhaul Choice for Heavy‑Machine Fleet Owners & Service Garages

   Genuine Hitachi planetary drive spare parts come with steep purchase costs and unstable supply cycles for these legacy large excavator models. This aftermarket assembly delivers load‑bearing performance and service lifespan comparable to OEM standards at factory‑direct price levels, lowering recurring maintenance cost for enterprises running multiple EX300‑5 machines.

5. Diversified Logistics Options for Global Machinery Component Distributors

   Stock‑ready goods can be shipped within 3 working days upon payment confirmation. Air freight fits urgent breakdown orders from remote mining zones. Consolidated sea cargo and full‑container shipping provide cost‑saving bulk purchasing solutions for distributors covering Africa, Southeast Asia, Middle East and Latin America markets.

Our factory owns over 10‑year accumulated experience in R&D and mass‑production for excavator final‑drive planetary components. Travel gearbox planetary assemblies act as our flagship product line. 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 operating conditions to continuously upgrade component anti‑shock property and long‑term service lifespan. Our planetary spare parts are exported to dozens of countries, building stable long‑term cooperative relationships with heavy‑machinery spare‑part dealers worldwide.