Hitachi EX300-5 Travel Gearbox 3rd Planetary Carrier Spider With Sun Gear Assy

Serving as a vital tertiary power transfer unit inside final drive travel reducer, this combined planetary spider and sun gear assembly is built for Hitachi EX300‑5 crawler excavators. Operating within harsh job‑site environments such as rock quarries, earthfill projects and rough off‑road travelling, this component endures constant torque fluctuation plus recurring impact stress during digging and moving cycles. Stable power output to both crawler tracks heavily relies on the intact condition of this 3rd‑stage planetary set.

All critical dimensions, spline profiles and mounting hole positions are strictly matched against original Hitachi part drawings, compatible with three interchangeable part numbers:1022198, 3075005, 3075003. End‑users can complete on‑site swap‑out directly. No machining alteration is needed. It helps mechanics shorten machine downtime, especially when genuine OEM parts face long lead‑time delays from official supply channels.

1. Multi‑Part‑Number Compatibility Exclusively for Hitachi EX300‑5 Final Drive

   Three cross‑reference part numbers 1022198 /3075005 /3075003 can mutually substitute one another. This carrier‑sun gear assy is developed matching EX300‑5 travel gearbox inner layout. It cannot be fitted onto other Hitachi excavator models. Strict dimensional replication keeps proper gear meshing clearance, preventing walking shake, abnormal grinding noise and accelerated gear wear after installation.

2. Forged One‑Piece Structure Boosts Survivability Under Rough Site Conditions

   Many low‑cost aftermarket carriers suffer spider cracking or sun gear tooth breakage when working continuously on rock‑strewn ground. Our one‑piece forging together with full heat‑treatment greatly improves impact resistance. It holds steady performance under long‑hour continuous excavation and frequent track travelling.

3. Multi‑Level Factory Testing Reduces On‑Site Repair Risks

   Every finished unit goes through two independent validation workflows before leaving factory. Comprehensive dimension check verifies all mating tolerances. Simulated real‑world heavy‑load test replicates quarry working stress to validate transmission stability. Potentially defective units get screened out internally, so repair shops and mine operators avoid unexpected machine stand‑still losses.

4. Economical Repair Alternative for Fleet Owners & Independent Repair Shops

   Original Hitachi planetary components come with high purchase cost and unstable supply lead‑times. This aftermarket assembly delivers near‑OEM load‑bearing performance and service life, sold at factory direct price. It effectively cuts repeated maintenance costs for companies running multiple EX300‑5 excavator fleets.

5. Diversified Shipping Choices for Global Machinery Spare‑Part Traders

   Stock items can be dispatched within 3 working days after payment confirmation. Air freight option supports urgent emergency breakdown orders from remote construction zones. Sea consolidation and full‑container services offer cost‑saving bulk procurement solutions for distributors covering Africa, Southeast Asia, Middle East and Latin America.

We have over 10‑year specialization in R&D and mass‑production of excavator final‑drive planetary components. Travel gearbox planetary assemblies are among our core product portfolio. Our complete production workflow covers alloy steel forging, precision gear machining, thermal treatment and finished‑product load simulation tests. Purpose‑built test benches simulate real‑world quarry and construction load conditions to continuously optimize component anti‑impact property and long‑term service life. Our planetary spare parts are exported worldwide, building stable long‑term cooperation with heavy machinery spare‑part dealers across many countries.