Hitachi EX1000 EX1000-1 Excavator Hydraulic Main Pump 4160879 4154587 Main Hydraulic Piston Pump Assembly Replacement
Welcome to our heavy machinery hydraulic supply center. A complete ZAX200-3 / ZAX240-3 excavator swing motor assembly (Part No. 4642948 / 4437432 / M5X130CHB) typically costs between $1,800 and $4,200 USD, depending on unit configuration and reduction gearbox choices. Precision-manufactured as a heavy-duty aftermarket replacement part compatible with Hitachi large engineering machinery equipment, this slewing device restores original 360-degree turning torque and operating stability under extreme jobsite loads.
- Product Name: Swing Motor Assembly / Slewing Device / Swing Reduction Gearbox
- Applicable Machine Models: Fit for Hitachi ZAX200-3, ZAX240-3, ZAX270-3, ZX200-3, ZX240-3 Excavators
- Reference Part Number / OEM: 4642948 / 4437432 / 4653603 / M5X130CHB
- Core Internal Parts: Swashplate piston motor, built-in swing relief valve, solenoid brake valves & planetary reduction gear set
- Condition: 100% Brand New Aftermarket / Direct Fit OEM Replacement
- Testing & Quality Assurance: 100% Hydraulic Pressure and Torque Bench Tested, 6–12 months warranty included
Our strict hydraulic testing program guarantees zero-defect performance before shipment:
- 1. Ultrasonic Cleaning & Crack Inspection: Casing housing and reduction gearboxes are ultrasonically cleaned and magnetic-particle tested for stress cracks.
- 2. Precision Honing & Lapping: Valve plates, cylinder blocks, and swashplates are ground to micron tolerances to eliminate internal oil bypass.
- 3. 100% Japanese High-Pressure Seal Installation: High-temperature oil seals are pre-installed to prevent external oil leaks from high working pressure.
- 4. Torque & Relief Valve Calibration: Swing relief valve spools are factory-calibrated to OEM holding pressure settings.
- 5. Hydraulic Bench Load Run-In Testing: Every complete assembly undergoes a 100% hydraulic test bench run to check rotation RPM, oil flow, and thermal stability.
Heavy turning loads cause internal wear over time. Replacing your worn slewing unit with our ZAX200-3 swing motor assembly directly resolves these 5 major operational failures:
Cause: Severe internal scoring on cylinder block/pistons or pressure leakage across valve seats.
Fix: Installing our complete assembly restores full system hydraulic pressure and fast 360-degree rotation speed under load.
Cause: Chipped planetary gear teeth, pitted bearings, or spline shaft wear inside the reduction gearbox.
Fix: Full unit replacement eliminates gear grinding, protecting your excavator’s main slewing ring gear.
Cause: Hardened main shaft oil seals or damaged casing gaskets from high heat and pressure spikes.
Fix: Pre-installed Japanese high-pressure oil seals permanently stop oil leaks and keep gear oil clean.
Cause: Contaminated hydraulic oil or sticking brake solenoid valve spools during turning.
Fix: Precision-machined spool clearances ensure smooth start/stop slewing control without sudden braking shocks.
Cause: Friction buildup caused by damaged internal bearings or improper oil circulation.
Fix: Optimized oil circulation channels and hardened alloy gears keep operating temperatures low under continuous work.
Designed for heavy 20-to-25 ton excavation demands, this swing motor suitable for Hitachi ZAX200-3 / ZAX240-3 excels in:
- Mining & Mass Earthmoving Construction: High torque output for continuous rapid slewing cycles with heavy loaded buckets.
- Trenching & Pipeline Installation: Smooth brake valve control allows accurate placement of heavy trench shoring and pipes.
- Demolition & Quarry Operations: Reinforced housing resists heavy radial forces and constant directional shocks.
Q: Where can I buy a replacement swing motor assembly compatible with Hitachi ZAX200-3 or ZAX240-3?
A: You can purchase brand-new aftermarket ZAX200-3 and ZAX240-3 swing motor assemblies directly from us. We stock complete units ready for fast worldwide shipping.
Q: What is the OEM part number for the ZAX200-3 swing motor?
A: Common reference part numbers include 4642948, 4437432, 4653603, and motor code M5X130CHB. Please verify your old motor nameplate before ordering.
Q: How much does a replacement swing motor for ZAX200-3 cost?
A: Replacement complete swing motor assemblies typically cost between $1,800 and $4,200 USD depending on whether a complete reduction gearbox and solenoid brake valves are included.
