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Hitachi ZAX200-1 ZX200-1 Excavator Swing Motor Assembly Slewing Motor 4426372 Complete Hydraulic Swing Device Aftermarket
Welcome to our heavy machinery hydraulic supply center. We specialize in providing the complete ZAX200-1 / ZX200-1 excavator swing motor assembly (Part No. 4426372 / 4398514), precision-manufactured as a heavy-duty aftermarket replacement part compatible with Hitachi large engineering machinery equipment. Designed to deliver original turning power and smooth slewing control, this complete swing device ensures high efficiency and reliability on demanding job sites.
- Product Name: Swing Motor Assembly / Slewing Motor Device / Swing Reduction Gearbox
- Applicable Machine Models: Fit for Hitachi ZAX200-1, ZX200-1, ZAXIS200-1 Excavators
- Reference Part Number / Code: 4426372 / 4398514 / M2X150
- Key Internal Components: Swashplate piston motor, swing relief valve, hardened planetary reduction gear set
- Condition: 100% Brand New Aftermarket / Direct OEM Replacement
- Quality Assurance & Warranty: 100% Hydraulic Pressure Tested before dispatch, 6–12 months warranty
If your 20-ton excavator is experiencing slewing performance loss, replacing your worn unit with our complete ZAX200-1 swing motor assembly directly resolves these major operational issues:
Cause: Severe internal wear on the plunger/cylinder block or relief valve pressure drop.
Fix: Installing our complete assembly restores original hydraulic pressure and fast 360-degree rotation speed.
Cause: Chipped pinion gears, worn bearing races, or planetary gear mesh damage.
Fix: Full unit replacement eliminates chatter, gear grind, and vibration to protect the excavator slewing ring.
Cause: Hardened or damaged main oil seals due to high temperature and pressure spikes.
Fix: Japanese high-pressure oil seals are built-in to eliminate oil leakage and safeguard hydraulic fluid integrity.
Cause: Contaminated hydraulic oil or sticking swing brake valve spools.
Fix: Precision-machined spool clearances ensure smooth start/stop slewing control without sudden braking shocks.
Cause: Friction buildup caused by insufficient lubrication or damaged internal bearings.
Fix: Optimized internal oil circulation channels keep operating temperatures low under heavy-duty continuous work.
Engineered for tough earthmoving tasks, this swing motor assembly suitable for Hitachi ZAX200-1 / ZX200-1 excels in:
- Earthmoving & Digging Operations: Delivers stable slewing torque during full-bucket cycles.
- Road Work & Infrastructure Construction: Precise braking control allows accurate placement of trench pipes and materials.
- Demolition & Quarrying: Durable casing resists radial forces and dynamic shock loads during breaker usage.
Q: Where can I buy a replacement swing motor assembly compatible with Hitachi ZAX200-1 or ZX200-1?
A: You can order complete aftermarket ZAX200-1 and ZX200-1 swing motor assemblies directly from us. We stock fully assembled ready-to-install units designed to exact original specs.
Q: How do I verify if this swing motor fits my ZAX200-1 excavator?
A: Check your old motor nameplate for reference part numbers such as 4426372 or 4398514. You can also send us photos of your hydraulic ports and mounting flange to confirm compatibility.
Q: Is this ZAX200-1 swing motor a direct drop-in replacement?
A: Yes, it features exact original mounting bolt dimensions, spline teeth, and hose threads, allowing easy plug-and-play installation without pipeline modification.
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