Travel Gearbox 2nd Planetary Carrier Spider With Sun Gear Assy for Hitachi ZX240

This second-stage planetary spider and matched sun gear assembly serves as the intermediate torque transfer unit inside the travel final drive of Hitachi ZX240-3 crawler excavators. It is widely deployed in urban infrastructure construction, quarry bulk material handling, deep foundation excavation and large-area land leveling works, catering to routine overhaul demands of equipment leasing companies, field maintenance workshops and cross-border spare parts distributors operating in Africa, Southeast Asia and the Middle East.

Located in the middle reduction section of the multi-stage travel gearbox, this planetary assembly undertakes power transmission between the first-stage and third-stage gear sets. It withstands alternating cyclic impact loads generated during frequent steering, full-load travel and uphill operations. Typical damage conditions include fatigue cracks on carrier support lugs, sun gear tooth chipping and surface pitting, as well as excessive abrasion of internal connecting splines. Once damaged, the excavator will display obvious faults such as unstable travelling power, speed difference between left and right tracks, continuous metallic grinding noise inside the reducer and abnormal heat buildup of the travel gearbox. Unexpected equipment breakdown will delay the whole construction schedule and raise emergency repair and component replacement costs for project contractors and equipment owners.

Our assembly is manufactured following OEM equivalent standards for gear tooth profile, spline fitting clearance and overall mounting dimension. No secondary cutting, drilling or modification work is required during travel gearbox overhaul, supporting direct replacement installation and effectively shortening machine downtime. As an affordable aftermarket alternative to high-priced genuine spare parts with unstable supply cycles, this product guarantees stable torque transmission at factory wholesale pricing, suitable for bulk procurement by cross-border construction machinery spare parts suppliers.

Core Technical Indexes

Unique Product Competitive Advantages

1. Precise dimensional replication, dedicated for Hitachi ZX240-3 travel reducer, non-interchangeable with other excavator models

   This planetary assembly is customized based on the internal cavity size of ZX240-3 travel gearbox and cannot be assembled onto other machine models. Accurate control over spline tolerance and gear meshing gap prevents transmission jitter, track deviation and accelerated wear of matched transmission components after installation, and no extra auxiliary fittings are needed during assembly.

2. One-piece integral forging structure, excellent impact resistance for frequent heavy-load construction tasks

   Many low-cost generic planetary carriers easily suffer lug fracture and gear tooth collapse under frequent start-stop impact loads. Our integral forging process together with standardized heat treatment improves overall structural toughness and extends service life. It maintains stable power output during repeated moving and digging cycles, helping rental fleets reduce the overall overhaul frequency of travel gearboxes.

3. Strict whole-process factory quality control to lower risks of unplanned machine halt

   Every finished assembly passes full dimension inspection and load simulation testing before shipment. Defective semi-finished products are screened out in advance, avoiding rework troubles for maintenance teams and economic losses caused by sudden equipment stoppage on construction sites.

4. Cost-effective aftermarket option to manage routine equipment maintenance budgets

   Genuine original planetary spare parts usually come with high prices and long lead times. Our aftermarket assembly achieves comparable load capacity and service lifespan as OEM components at factory direct price, cutting annual maintenance expenditure for enterprises operating multiple excavators.

5. Multiple global logistics choices for bulk wholesale buyers

   In-stock goods can be arranged for delivery within 3 working days after payment confirmation. Air freight meets the demand of urgent emergency repair orders; consolidated sea freight and full-container shipment provide economical bulk purchasing solutions for long-term distributors.

Factory Production Strength

Our manufacturing workshop specializes in the research and production of planetary gear spare parts for travel gearboxes of various excavator brands. We have a complete production chain covering alloy steel die forging, precision gear machining, professional heat treatment and finished product performance testing. The independent torque simulation test bench replicates harsh real-site working conditions to continuously improve product wear resistance and impact tolerance. Our planetary gear assemblies are exported to many overseas regions and maintain long-term stable cooperative relations with global construction machinery spare parts wholesalers.

Frequently Asked Customer Questions