Hitachi EX300-5 Travel Gearbox 1st Planetary Carrier Spider With Sun Gear Assy

This fully‑integrated first‑stage planetary spider and sun gear assembly acts as the primary torque‑transfer component installed at the input end of travel reduction final drive, purpose‑built for Hitachi EX300‑5 heavy‑duty crawler excavator. Continuous rock excavation, bulk earth‑moving and frequent relocation across rough job‑site terrain impose heavy impact loads and high torque stress upon this transmission unit. Once the 1st‑stage planetary assembly suffers spider fracture, sun gear tooth breakage or spline wear, operators will encounter drastic travel power drop, unilateral track weakness, persistent metallic rattling noise and abnormal temperature rise inside the final drive housing.

All gear tooth profiles, internal spline parameters and mounting hole dimensions strictly comply with original Hitachi component specifications. Three cross‑reference part numbers 1022196, 3075001 and 2038915 are fully interchangeable during gearbox overhaul. Direct drop‑in installation can be realized without extra re‑machining operations. It effectively shortens equipment downtime for maintenance crews, especially when genuine OEM stock is hard to source for this classic heavy‑duty excavator model.

1. Multi‑PN Interchangeable Assembly Custom‑Engineered for Hitachi EX300‑5 Final Drive System Part numbers 1022196, 3075001 and 2038915 can mutually substitute each other during final drive rebuild projects. This carrier‑sun gear assembly is precisely matched to the inner structural layout of EX300‑5 travel reducer and cannot fit other Hitachi excavator families. Strict dimensional replication maintains ideal gear meshing clearance, preventing track offset deviation, jerky track movement, harsh internal grinding noise and accelerated part wear after field installation.
2. One‑piece Forged Construction Enhances Structural Durability Under Severe Working Circumstances Numerous low‑cost aftermarket planetary carrier products are prone to spider cracking or sun gear tooth chipping under long‑time heavy‑load mining operations. Our integral forging process coupled with complete multi‑step thermal‑treatment workflow greatly improves anti‑impact and fatigue‑resistant performance. It sustains stable running performance under non‑stop digging cycles and frequent cross‑site equipment transfer.
3. Two‑step Pre‑delivery Quality Verification Eliminates Potential In‑field Failure Risks Each finished assembly passes two independent inspection procedures before factory delivery. Comprehensive dimension calibration checks all mating tolerances for gear and spline surfaces. Simulated mine‑site heavy‑load testing reproduces real‑world working stress to validate transmission stability. Potentially defective units are filtered out internally, assisting repair shops and mine operators to avoid unexpected machine stand‑still losses.
4. Budget‑friendly Rebuild Alternative for Heavy‑equipment Fleet Operators & Service Workshops Genuine Hitachi planetary drive spare parts come with high purchase cost and unstable supply lead‑time for this legacy large excavator model. This aftermarket assembly achieves load‑bearing performance and service life comparable to OEM benchmarks at factory‑direct price points, cutting down recurring maintenance expenses for enterprises managing multiple EX300‑5 excavator assets.
5. Flexible Multimodal Shipping Solutions for Global Machinery Spare‑part Distributors Stock‑available goods can be dispatched within 3 working days upon payment confirmation. Air freight solution supports urgent breakdown orders for remote mining zones. Consolidated sea cargo and full‑container shipping deliver cost‑efficient bulk purchasing options for distributors covering Africa, Southeast Asia, Middle East and Latin America markets.

Our production facility possesses over 10‑year accumulated experience in R&D and mass‑production of excavator final‑drive planetary components. Travel gearbox planetary assemblies belong to our core flagship product lines. Our closed‑loop production workflow covers alloy steel forging, high‑precision gear cutting, professional thermal treatment and finished‑product load‑simulation evaluation. Dedicated heavy‑load test benches replicate harsh mine and infrastructure‑site operating environments to continuously boost component anti‑shock performance and long‑term service lifespan. Our planetary spare parts are exported to dozens of countries, building stable long‑term cooperative partnerships with heavy‑machinery spare‑part dealers across the globe.