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Quality Hitachi EX120-2 EX120LC-2 Excavator Swing Motor Assembly Slewing Motor 4241171 4334356 Complete Hydraulic Swing Device Replacement factory
Quality Hitachi EX120-2 EX120LC-2 Excavator Swing Motor Assembly Slewing Motor 4241171 4334356 Complete Hydraulic Swing Device Replacement factory
Quality Hitachi EX120-2 EX120LC-2 Excavator Swing Motor Assembly Slewing Motor 4241171 4334356 Complete Hydraulic Swing Device Replacement factory
Quality Hitachi EX120-2 EX120LC-2 Excavator Swing Motor Assembly Slewing Motor 4241171 4334356 Complete Hydraulic Swing Device Replacement factory
Quality Hitachi EX120-2 EX120LC-2 Excavator Swing Motor Assembly Slewing Motor 4241171 4334356 Complete Hydraulic Swing Device Replacement factory

Hitachi EX120-2 EX120LC-2 Excavator Swing Motor Assembly Slewing Motor 4241171 4334356 Complete Hydraulic Swing Device Replacement

Place of Origin:China
Brand Name:HanRui
Model Number:120-2
Minimum Order Quantity:1 pc
Payment Terms:T/T,Western Union,Trade Assurance
Supply Ability:10000 pcs
Product Details
Product Type: Excavator Aftermarket Spare Parts
Application: Small & Medium Heavy Excavator Construction Machinery
Condition: Repair Kit
Brand: Han Rui
Product Type: Hydraulic Main Piston Pump Assembly
Condition: Brand New Aftermarket Replacement Spare Parts
Warranty: 12 Months Factory Warranty
MOQ: 1 Piece
Usage Scenario: Mining, Quarry, Road & Infrastructure Construction
Solved Problems: Oil Leakage, Low Torque, Equipment Vibration & Swing Failure
Product Description

Welcome to our heavy machinery hydraulic supply center. We specialize in providing the complete EX120-2 / EX120LC-2 excavator swing motor assembly (Part No. 4241171 / 4334356), precision-manufactured as a heavy-duty aftermarket replacement part compatible with Hitachi large engineering machinery equipment. Engineered to restore original slewing torque and turning speed, this complete swing device ensures high efficiency and durability on demanding jobsites.

Key Technical Specifications & Parameters

  • Product Name: Swing Motor Assembly / Slewing Motor Device / Swing Reduction Gearbox
  • Applicable Machine Models: Fit for Hitachi EX120-2, EX120LC-2, EX120-2m Excavators
  • Reference Part Number / OEM: 4241171 / 4334356 / 4330219
  • Key Internal Components: Swashplate axial piston motor, integrated swing relief valve, precision planetary reduction gears
  • Condition: 100% Brand New Aftermarket / Direct OEM Fit Replacement
  • Quality Assurance & Warranty: 100% Factory Hydraulic Pressure Tested, 6–12 months warranty included

EX120-2 Excavator Swing Motor Common Faults & Solutions
If your 12-ton excavator is experiencing rotation power loss, replacing your worn unit with our complete EX120-2 swing motor assembly directly resolves these critical operational issues:

1. Weak Swing Torque / Slow Rotation (回转无力)
Cause: Severe wear on cylinder block/pistons or pressure loss across relief valve seats.
Fix: Replacing the complete assembly restores original working hydraulic pressure and fast 360-degree rotation speed.

2. Abnormal Noise & Heavy Vibration (抖动异响)
Cause: Chipped planetary gear teeth, damaged pinion gear splines, or worn bearings.
Fix: Full assembly replacement eliminates gear grinding and chatter, protecting your excavator’s main slewing ring gear.

3. Hydraulic Oil Leakage from Shaft Seal (回转漏油)
Cause: Aged or blown main shaft oil seals due to high pressure spikes.
Fix: Japanese high-pressure oil seals are built-in to prevent oil contamination and maintain fluid system integrity.

4. Swing Sticking / Jerky Rotation (回转卡顿)
Cause: Contaminated hydraulic oil or sticking swing brake valve spools.
Fix: Precision-machined spool clearances ensure smooth start/stop slewing response without sudden braking shocks.

5. Overheating Swing Gearbox (回转高温)
Cause: Friction buildup caused by damaged internal bearings or bad gear oil circulation.
Fix: Optimized lubrication channels and hardened alloy gears keep operational temperatures low under continuous work.

Worksite Applications & Operating Scenarios
Engineered for versatile medium-class excavation tasks, this swing motor assembly suitable for Hitachi EX120-2 excels in:

  • General Construction & Earthmoving: Delivers continuous, reliable turning torque for excavating and loading trucks.
  • Trenching & Pipeline Installation: Smooth brake valve control allows exact placement of heavy pipes and shoring.
  • Demolition & Site Clearance: Durable casing resists radial forces and vibration under hydraulic breaker operation.

Frequently Asked Questions (FAQ)

Q: Where can I buy a replacement swing motor assembly compatible with Hitachi EX120-2?
A: You can purchase brand-new aftermarket EX120-2 swing motor assemblies directly from us. We stock fully assembled, ready-to-install units designed to original factory specifications.

Q: What is the OEM part number for the Hitachi EX120-2 swing motor?
A: Common OEM reference numbers for the EX120-2 swing device include 4241171, 4334356, and 4330219. Please verify your old motor nameplate or contact us for confirmation.

Q: Is this EX120-2 swing motor a direct bolt-on replacement?
A: Yes, it features exact original mounting bolt hole dimensions, spline teeth, and hose threads for direct drop-in replacement without modifications.

Recommended Hot-Selling Excavator Spare Parts
We also supply a comprehensive range of hydraulic components, travel drives, and engine assemblies for major excavators:

Product CategoryPart DescriptionCompatible Excavator ModelsReference Part Number / OEM
Swing Motor AssemblyComplete Slewing Motor with Reduction GearboxEX120-2, EX120-3, EX120-54241171, 4334356
Hydraulic Main PumpAxial Piston Main Hydraulic PumpEX120-2, EX120-3, EX120-5HPV091, 9110712
Travel Motor AssemblyFinal Drive Travel Reduction MotorEX120-2, EX120-3, EX120-59180731, 9150036
Main Control ValveHydraulic Distributing Control ValveEX120-2, EX200-5, ZX350-64333838, 4437432
Diesel Engine AssemblyComplete Engine Unit / Long BlockFor Isuzu 4BD1T / 4BG1 Diesel Engines8-94391696-0, 8-97108990-0
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