Hitachi ZX450 EX400-3 EX400-5 Travel Gearbox 3rd Planetary Carrier Spider With

This 3rd‑stage planetary carrier & sun gear assembly serves as the final torque‑transfer core component inside the travel reduction gearbox for large‑sized Hitachi excavators ZX450, EX400‑3 and EX400‑5. It undertakes heavy torque output to drive track movement under high‑load mining and earth‑moving scenarios. This combined spider‑carrier plus sun gear unit is widely sourced by overseas mining‑site repair workshops, heavy‑equipment rental operators and cross‑border spare‑part merchants for travel gearbox overhaul and worn‑component direct replacement.

Subjected to long‑duration heavy shock load, abrasive dust contamination and frequent forward‑reverse track switching in mining conditions, the original carrier assembly will suffer gear tooth pitting, spider shaft wear, spline damage and abnormal clearance enlargement. Typical failure symptoms include track slipping, uneven traveling speed, harsh metallic grinding noise inside final drive, overheating of travel gearbox housing, and even track halt under heavy digging load. Sudden damage to this 3rd‑stage component will paralyze machine movement and bring considerable downtime losses for mining and construction projects.

Our aftermarket assembly strictly follows OEM drawing standards for mounting dimensions, spider shaft tolerance, gear tooth profile and spline parameters. No welding, cutting or extra modification is required during gearbox reassembly. As a reliable substitute for high‑cost original OEM parts with long delivery cycles, this unit maintains stable torque transmission performance and satisfies bulk procurement demands for global suppliers of large Hitachi excavator spare parts.

1. Strict dimensional interchangeability matching original travel gearbox structure Produced in accordance with OEM technical specifications, this whole assembly keeps consistent gear tooth parameters, spider shaft dimension and spline precision. Precisely machined mating surfaces guarantee proper gear meshing after installation. No secondary machining work is needed in gearbox reassembly, helping mechanics finish travel gearbox overhaul efficiently.
2. Reinforced anti‑fatigue craft for mining‑oriented heavy‑load working conditions Many low‑cost replacement carriers suffer early tooth breakage and spider shaft deformation under mining‑site impact load. Our key stress‑bearing components adopt integral forging plus deep carburizing quenching process to improve fatigue resistance, helping fleet owners cut replacement frequency for heavily‑operated ZX450, EX400‑3 and EX400‑5 machines.
3. Rigorous inspection before delivery to avoid premature gearbox failure on site Every finished assembly undergoes gear tooth inspection, spline dimension measurement and meshing clearance test before packing. Defective workpieces are eliminated at factory, reducing re‑work risks for maintenance teams and preventing unexpected machine stand‑still losses on mining sites.
4. Cost‑effective aftermarket solution for large excavator overhaul budget management Genuine OEM planetary carrier assemblies for these large Hitachi models carry high purchase cost and unstable supply cycles. Our factory‑direct aftermarket assembly provides dependable torque transmission performance and full compatibility, lowering annual repair expenditure for customers managing heavy‑duty excavator fleets.
5. Flexible global logistics support for wholesale purchasers In‑stock goods support prompt shipment after payment confirmation. Air freight is available for urgent breakdown repair orders; consolidated sea freight and full‑container options provide cost‑saving solutions for long‑term bulk importers of heavy‑equipment spare parts.

Our manufacturing plant focuses on R&D and mass‑production of travel gearbox components including planetary carrier assemblies, sun gears and planet gears for large‑tonnage excavators. We possess complete production workflows: alloy‑steel forging, heat‑treatment, CNC tooth‑grinding and strict dimensional inspection. Professional gear‑meshing simulation testing replicates real‑site heavy‑impact working status of mining excavators to verify component durability. Our final‑drive spare parts are exported to multiple overseas markets and maintain long‑term stable partnerships with global construction‑machinery spare‑part wholesalers focused on heavy‑duty mining equipment.

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

Q2: What gearbox failures can this assembly solve? A2: It resolves malfunctions caused by worn sun gear, pitted gear teeth, deformed spider shaft and damaged splines: travel gearbox abnormal grinding noise, track slipping, uneven traveling speed and travel unit overheating.

Q3: Is volume‑based discount available for bulk‑quantity orders? A3: Yes, tiered preferential price is offered subject to purchase quantity. Full‑container sea shipment can be arranged to cut comprehensive logistics costs.

Q4: What packaging is adopted for long‑distance overseas transportation? A4: Anti‑rust oil is evenly applied on all gear and spline surfaces. The whole assembly is wrapped with waterproof shock‑proof PE film, then fixed inside reinforced export‑grade plywood case, preventing collision deformation and rust damage during long‑haul ocean transit.