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ZAX200-3 ZAX200-5G Swing Motor Assembly Compatible with Hitachi 4642948
Welcome to our heavy machinery hydraulic supply center. We specialize in providing the complete ZAX200-3 / ZAX200-5G excavator swing motor assembly (Part No. 4642948), precision-manufactured as a heavy-duty aftermarket replacement part compatible with Hitachi large engineering machinery equipment. Engineered to restore original slewing torque and operational precision, this complete swing device ensures high reliability under extreme working conditions.
- Product Name: Swing Motor Assembly / Slewing Motor Device / Swing Reduction Gearbox
- Applicable Machine Models: Fit for Hitachi ZAX200-3, ZAX200-5G, ZX200-3, ZX210-3 Excavators
- Reference Part Number / OEM: 4642948 / 4437432 / M5X130CHB
- System Function: Provides hydraulic slewing power for upper structure 360-degree continuous rotation
- Condition: 100% Brand New Aftermarket / Direct Replacement
- Warranty & Quality Control: 100% Factory Hydraulic Pressure Tested, 6–12 months warranty included
Replacing your worn-out slewing unit with our complete ZAX200-3 / ZAX200-5G swing motor assembly directly resolves the following major operational issues:
Cause: Internal wear on plunger pistons/cylinder block or internal pressure drop in the relief valve.
Fix: Installing our assembly restores full hydraulic working pressure and fast turning speed.
Cause: Broken gear teeth, worn bearing races, or planetary gear backlash.
Fix: Full assembly replacement eliminates noise and vibration, protecting the main slewing ring gear.
Cause: Aged or cracked main shaft oil seals due to pressure spikes.
Fix: High-pressure Japanese oil seals are pre-installed in our unit to stop oil contamination permanently.
Cause: Contaminated hydraulic fluid or sticking brake valve spools.
Fix: Precision-machined spool clearances ensure smooth start/stop slewing control without sudden shocks.
Cause: Friction buildup caused by damaged internal components or improper oil circulation.
Fix: Optimized oil passage design reduces operational friction and prevents thermal shutdown under continuous operation.
Engineered for high-intensity 20-ton excavator work, this swing motor assembly suitable for Hitachi ZAX200-3 / ZAX200-5G performs reliably in:
- Mining & Heavy Earthmoving: High torque output for continuous slewing under heavy bucket loading.
- Demolition & Quarrying: Reinforced housing withstands heavy radial impacts and vibration.
- Trenching & Infrastructure Construction: Precise swing braking control allows exact placement of pipes and materials.
Q: Where can I buy a replacement swing motor assembly compatible with Hitachi ZAX200-3 or ZAX200-5G?
A: You can purchase brand-new aftermarket ZAX200-3 and ZAX200-5G swing motor assemblies directly from us. We provide full units engineered to exact bolt-on dimensions for seamless replacement on Hitachi machinery.
Q: What is the part number for the ZAX200-3 swing motor?
A: Common reference part numbers include 4642948, 4437432, and motor model M5X130CHB. Please check your machine's nameplate or send us photos to confirm fitment.
Q: Is this swing motor assembly plug-and-play for ZAX200-5G excavators?
A: Yes, it features exact OEM mounting dimensions, hydraulic port threads, and splines, allowing direct drop-in installation without pipeline modifications.
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