Hitachi ZX120 Travel Gearbox 2nd Planetary Carrier Spider With Sun Gear Assy for Excavator Parts 1027076 3085566 3085569

This second-stage planetary spider and matched sun gear assembly is a core deceleration component fitted inside the travel final drive of Hitachi ZX120 crawler excavators. Widely used in urban foundation works, pipeline laying, landscaping and small-scale quarrying, it meets the maintenance demands of numerous small and medium engineering fleets across Africa, Southeast Asia and the Middle East.

Positioned in the middle reduction section of the multi-stage travel gearbox, this planetary set continuously bears alternating torque loads during frequent start-stop travelling, short-distance site relocation and slope operation. When carrier support lugs develop fatigue fractures, sun gear teeth experience pitting or breakage, and internal splines suffer excessive wear, typical failures will occur: uneven travelling speed between two tracks, persistent abnormal grinding sound inside the reducer, insufficient traction when climbing slopes and travel gearbox overheating. Unexpected breakdowns delay construction schedules and bring extra repair costs for equipment rental companies, maintenance workshops and project contractors.

Our assembly adopts production standards consistent with Hitachi OEM specifications for gear tooth profile, spline fitting clearance and mounting dimension. No secondary cutting or drilling modification is needed during gearbox overhaul, enabling direct replacement installation and shortening machine downtime. As an economical aftermarket substitute for expensive original spare parts with unstable supply cycles, this product delivers reliable transmission performance at factory wholesale prices, perfectly catering to bulk procurement needs of spare parts dealers and cross-border machinery suppliers.

1. Strict 1:1 dimension replication, dedicated for Hitachi ZX120 travel gearbox, cannot be interchanged with other models

   This planetary assembly is customized according to the internal structure of ZX120 travel reducer, incompatible with other Hitachi models such as ZX130 or ZX110. Precise control of spline tolerance and gear meshing gap effectively avoids transmission jitter, track deviation and accelerated wear of matched parts after installation, without additional auxiliary accessories for assembly.

2. Integral forging molding, outstanding impact resistance to adapt to frequent short-cycle construction work

   Many low-cost generic planetary carriers are prone to lug fracture and tooth collapse under frequent start-stop impact. Our integral forging process, cooperating with standardized heat treatment, improves overall structural toughness and service life. It maintains stable power output during repeated moving and digging work, effectively reducing the maintenance frequency of travel gearboxes for fleet operators.

3. Complete factory inspection procedure to lower the risk of sudden equipment shutdown

   Every finished assembly undergoes strict dimension detection and load simulation test before delivery. We screen out unqualified products in advance to avoid rework troubles caused by non-conforming spare parts for repair teams, and reduce construction loss brought by machine halts.

4. Affordable aftermarket option to control regular equipment maintenance expenditure

   Genuine Hitachi planetary spare parts often have high prices and long delivery cycles. Our aftermarket assembly achieves comparable load capacity and service life as OEM parts with factory direct pricing, helping enterprises with multiple ZX120 excavators cut annual maintenance budgets.

5. Flexible global logistics solutions for bulk wholesale customers

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

Our factory has rich manufacturing experience in producing planetary spare parts for Japanese brand excavator travel gearboxes. We possess a complete production chain covering die forging, precision gear processing, professional heat treatment and finished product testing. Special torque test equipment simulates actual construction working conditions to optimize product durability. Our planetary gear components are exported to many overseas regions, maintaining long-term cooperative relations with global construction machinery spare parts wholesalers.