Travel Gearbox 1st Planetary Carrier Spider With Sun Gear Assy for Hitachi ZX120 Excavator Parts 2043774 2043769 3085568

This first-stage planetary spider assembly matched with dedicated sun gear acts as the primary torque reduction component installed inside the travel final drive of Hitachi ZX120 crawler excavators. Widely used in urban infrastructure renovation, pipeline burial, land leveling and small-scale quarry excavation, this spare part caters to maintenance demands of equipment leasing teams, on-site repair workshops and cross-border spare parts distributors operating in Africa, Southeast Asia and the Middle East.

Located at the initial deceleration position of multi-stage travel gearbox, this planetary set bears the original torque input transmitted from the travel motor, enduring repeated impact loads during frequent start-stop movement, short-distance site transfer and uphill working conditions. Common damage forms include fatigue cracks on carrier support lugs, pitting and tooth breakage of sun gear, as well as serious abrasion of internal splines. Once damaged, the excavator will show obvious faults: slow travel response, speed difference between left and right tracks, continuous abnormal metal friction noise and excessive temperature rise of the travel reducer. Sudden equipment halt delays construction progress and increases labor and replacement costs for contractors and equipment owners.

Our assembly is produced according to OEM equivalent standards in terms of gear tooth profile, spline matching clearance and overall installation dimension. No secondary cutting, drilling or modification work is required during travel gearbox maintenance, enabling direct replacement installation and effectively cutting machine downtime. As an economical aftermarket substitute for expensive original Hitachi spare parts with long delivery cycles, this product guarantees stable torque transmission performance at factory wholesale price, suitable for bulk procurement of international engineering machinery suppliers.

1. Accurate size matching, specially developed for Hitachi ZX120 travel gearbox, cannot be used interchangeably with other models

   This planetary assembly is customized according to the internal cavity structure of ZX120 travel reducer and cannot be assembled on other Hitachi excavator models. Precise control of spline tolerance and gear meshing gap avoids transmission jitter, track deviation and accelerated wear of matched transmission components after installation, and no additional auxiliary accessories are needed during assembly.

2. Integral forging molding, strong impact resistance for frequent short-cycle construction operations

   Many low-cost universal planetary carriers are prone to support lug fracture and gear tooth collapse under frequent start-stop impact loads. Our integral forging process combined with standardized heat treatment improves the overall structural toughness and extends the service cycle. It can maintain stable power output during repeated moving and digging work, and effectively reduce the overhaul frequency of travel gearboxes for rental fleets.

3. Complete factory quality inspection flow to reduce the risk of unplanned shutdown

   Each finished assembly passes strict full-size inspection and load simulation test before leaving the factory. Unqualified semi-finished products are eliminated in advance, avoiding rework troubles for maintenance teams and economic losses caused by sudden equipment shutdown on construction sites.

4. Cost-effective aftermarket solution to control daily equipment maintenance budget

   Genuine Hitachi planetary spare parts are usually high-priced with unstable stock supply. Our aftermarket assembly has the same load-bearing capacity and service life as OEM parts at the factory direct selling price, helping enterprises with multiple excavators cut annual maintenance expenses.

5. Flexible global logistics scheme for bulk wholesale buyers

   In-stock products can be delivered within 3 working days after payment confirmation. Air freight supports urgent emergency repair orders; consolidated sea freight and full-container shipping provide cost-saving plans for long-term bulk distributors.

Our manufacturing workshop focuses on the R&D and production of planetary gear spare parts for travel gearboxes of Japanese excavator brands. We have a complete production chain including alloy steel die forging, precision gear processing, professional heat treatment and finished product performance test. The independently developed torque simulation test bench simulates harsh actual working conditions to continuously optimize the wear resistance and impact resistance of products. Our planetary gear assemblies are exported to many overseas regions and maintain long-term stable cooperative relations with global construction machinery spare parts wholesalers.