Hitachi ZAX200-3 ZAX240-3 ZAX270-3 Swing Motor 4642948 4437432 Slewing Motor Complete Hydraulic Swing Device Replacement
Welcome to our heavy machinery hydraulic supply center. We specialize in providing the complete ZAX200-3 / ZAX240-3 / ZAX270-3 excavator swing motor assembly (Part No. 4642948 / 4437432 / M5X130CHB), precision-manufactured as a heavy-duty aftermarket replacement part compatible with Hitachi large engineering machinery equipment. Engineered to restore original slewing torque and 360-degree rotation stability, this complete swing device ensures high efficiency under demanding jobsite conditions.
- Product Name: Swing Motor Assembly / Slewing Motor Device / Swing Reduction Gearbox
- Applicable Machine Models: Fit for Hitachi ZAX200-3, ZAX240-3, ZAX270-3, ZX200-3, ZX240-3, ZX270-3 Excavators
- Reference Part Number / Motor Code: 4642948 / 4437432 / 4653603 / M5X130CHB
- Key Internal Components: Swashplate piston motor, integrated swing relief valve block, solenoid brake valves, and planetary reduction gears
- Condition: 100% Brand New Aftermarket / Direct OEM Fit Replacement
- Quality Assurance & Warranty: 100% Hydraulic Pressure and Torque Bench Tested, 6–12 months warranty included
Heavy turning loads cause internal motor and gearbox wear over time. Replacing your worn unit with our complete swing motor assembly directly resolves these critical operational failures:
Cause: Severe internal wear on plunger pistons/cylinder block or pressure leakage across valve seats.
Fix: Installing our complete assembly restores full hydraulic pressure and fast 360-degree rotation speed under bucket loads.
Cause: Chipped planetary gear teeth, worn bearing races, or spline shaft damage inside the reduction gearbox.
Fix: Full unit replacement eliminates gear grinding and chatter, protecting your excavator’s main slewing ring gear.
Cause: Hardened or blown main shaft oil seals due to high working heat and pressure spikes.
Fix: Built-in Japanese high-pressure oil seals prevent external fluid leaks and keep gear oil clean.
Cause: Contaminated hydraulic fluid 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 lubrication.
Fix: Optimized lubrication channels and hardened alloy gears keep operating temperatures low under continuous work.
Designed for versatile 20-to-27 ton excavating tasks, this swing motor assembly suitable for Hitachi ZAX200-3 / ZAX240-3 / ZAX270-3 excels in:
- Mining & Earthmoving Construction: Supplies continuous turning force for rapid full-bucket cycles and truck loading.
- Trenching & Pipeline Works: Smooth braking valve control allows precise boom alignment during pipe placement.
- Demolition & Quarrying: Durable casing withstands severe radial forces and vibration under breaker operations.
Q: Where can I buy a replacement swing motor assembly compatible with Hitachi ZAX200-3, ZAX240-3, or ZAX270-3?
A: You can purchase brand-new aftermarket ZAX200-3 / ZAX240-3 / ZAX270-3 swing motor assemblies directly from us. We stock complete units ready for fast worldwide shipping.
Q: What is the OEM part number for the ZAX240-3 swing motor?
A: Common reference part numbers include 4642948, 4437432, 4653603, and motor code M5X130CHB. Please verify your old motor tag before ordering.
Q: Is this ZAX270-3 swing motor a direct drop-in replacement?
A: Yes, it features exact original mounting bolt hole dimensions, spline shafts, and hose port threads for direct bolt-on installation.
