Travel Gearbox 2nd Planetary Carrier Spider With Sun Gear Assy for Hitachi ZX450 EX400‑3 EX400‑5 Excavator 1015523 4203180

Product Brief

This complete 2nd‑stage planetary carrier spider and sun gear assembly is the critical torque reduction component housed inside the travel gearbox for Hitachi heavy‑duty excavators ZX450, EX400‑3 and EX400‑5. It undertakes heavy load deceleration and power output to drive track movement under mine excavation, rock handling and large‑scale earthmoving conditions. This aftermarket replacement unit is widely sourced by overseas heavy‑equipment service depots, mining project maintenance teams and cross‑border spare‑part dealers for travel reducer rebuild and direct swap of worn internal transmission parts.

Working under continuous heavy impact torque, harsh dust intrusion and frequent forward‑reverse track switching, the original assembly will generate gear tooth spalling, spider shaft journal wear, spline abrasion and enlarged gear meshing gap. Typical failure symptoms include track stuttering while travelling, deviation during straight driving, loud metal grinding noise from final drive, excessive travel gearbox temperature rise, and track failing to move under heavy digging resistance. Once this third‑stage planetary part is severely damaged, the excavator will lose travelling capacity and bring substantial production loss for construction and mining projects.

Our aftermarket assembly strictly follows OEM technical standards for mounting size, spider shaft concentricity, gear tooth profile and spline dimension. No cutting, welding or extra adapter modification is required during gearbox reassembly. As a practical alternative to expensive original OEM spare parts with long lead‑time, this assembly delivers stable torque transmission performance and meets bulk purchasing requirements for global Hitachi heavy excavator spare‑part suppliers.

Core Technical Indexes

Unique Product Competitive Advantages

1. High‑precision interchangeability matching original travel gearbox structure Manufactured strictly according to OEM drawing specifications, this whole assembly keeps consistent gear modulus, spider shaft dimension and spline accuracy. Precisely processed mating surfaces ensure smooth gear meshing after installation. No secondary machining work is needed during gearbox reassembly, allowing maintenance technicians to complete final‑drive overhaul efficiently.
2. Upgraded anti‑fatigue performance adapting to harsh mine site working scenarios Many low‑cost replacement carriers suffer early spider shaft distortion and gear tooth breakage under frequent rock‑digging shock load. Our core load‑bearing components adopt integral forging plus deep carburizing quenching technology to enhance durability, helping fleet operators cut replacement frequency for heavily‑used ZX450, EX400‑3 and EX400‑5 excavators.
3. Strict multi‑item factory inspection before delivery to prevent premature on‑site failure Each finished assembly passes gear tooth visual inspection, spline dimension detection and gear meshing clearance test before packing. Defective products are filtered out at factory side, lowering re‑work risks for maintenance crews and avoiding unexpected machine shutdown losses on construction sites.
4. Reliable aftermarket solution for heavy excavator overhaul cost control Genuine OEM planetary carrier assemblies for these Hitachi large models come with high purchase cost and unstable supply cycle. Our factory‑direct aftermarket assembly offers dependable torque‑transfer stability and full compatibility, reducing annual repair cost for customers managing multiple heavy‑duty excavator fleets.
5. Diversified global logistics support for wholesale buyers In‑stock items support fast shipment upon payment confirmation. Air freight is available for urgent emergency repair orders; consolidated sea freight and full‑container options provide cost‑saving choices for long‑term bulk importers of heavy construction machinery spare parts.

Factory Production Strength

Our production base specializes in R&D and mass‑production of travel gearbox components including planetary carrier assemblies, sun gears and planet gears for large‑tonnage excavators. We have complete production procedures: alloy‑steel forging, professional heat‑treatment, CNC gear grinding and multi‑dimension inspection. Professional gear meshing simulation equipment replicates real‑world heavy‑impact working conditions of mining excavators to verify component service life. Our final‑drive spare parts are exported to multiple overseas regions and maintain long‑term stable cooperation with global heavy‑equipment spare‑part wholesalers.

Frequently Asked Customer Questions

Q1: Can this 2nd‑stage carrier assembly fit other Hitachi excavator models besides ZX450, EX400‑3 and EX400‑5? A1: Cross‑model fitment is not recommended. Different travel gearbox assemblies vary in gear modulus, spider shaft size and spline specifications. Please double‑confirm machine model and original part number before placing orders.

Q2: What gearbox faults can this assembly repair? A2: It solves problems caused by worn sun gear, spalled gear teeth, deformed spider shaft and damaged splines: loud grinding noise inside travel gearbox, track jitter, travelling deviation and final‑drive housing overheating.

Q3: Can I get quantity discount for bulk orders? A3: Yes, tiered preferential price is offered based on purchase volume. Full‑container sea shipment can be arranged to reduce overall logistics cost.

Q4: What packaging is used for long‑distance overseas shipment? A4: Anti‑rust oil is evenly coated on all gear and spline surfaces. The complete assembly is wrapped with waterproof shock‑absorbing PE film, then fixed inside reinforced export‑grade plywood case to avoid collision deformation and rust during long‑haul ocean transit.