708-1W-41570 Hydraulic Pump For Komatsu WA380 wheel loader

708-1W-41570 Hydraulic Pump For Komatsu WA380 wheel loader Featured Image
  • 708-1W-41570 Hydraulic Pump For Komatsu WA380 wheel loader

Short Description:

708-1W-01840 is a variable axial piston main hydraulic pump designed for Komatsu PW98MR wheeled excavator, matched with HydrauMind E-CLSS electronic closed load sensing hydraulic system.

Product Detail

Product Tags

description

This variable piston pump adopts power sensing regulator with electronic proportional signal feedback. The pump automatically reduces displacement when encountering heavy digging load to limit absorbed torque and prevent engine stall. Built-in pressure cutoff valve protects hydraulic components from pressure spike damage. The integrated pump structure combines main pump and auxiliary pilot oil passage, simplifying installation layout.
The pump housing adopts high-strength alloy cast iron with stress relief treatment, resisting repeated pressure shock under heavy load. The piston and sliding shoe friction pair uses vacuum ion nitriding treatment, improving wear resistance under contaminated hydraulic oil. The matched valve plate adopts ultra-precision plane grinding to keep low internal leakage. Multi-stage composite sealing assembly resists dust and wide temperature variation in open-air sites.
All finished pumps pass bench tests including power sensing calibration, full-cycle fatigue test and long-duration leakage inspection. Original mounting hole layout and spline interface support direct installation without modification.

product parameters

Part No：708-1W-41570
Product Type：Power Sensing Variable Axial Piston Main Pump
Applicable Equipment：Komatsu WA380-6, WA430-6 Wheel Loader
Core Technology：Power sensing regulation, electronic proportional control, torque limiting
Theoretical Displacement：94 cc/rev
Rated Working Pressure：22.5 MPa (225 bar)
Max Instantaneous Peak Pressure：27 MPa (270 bar)
Rated Working Speed：1800 rpm
Max Allowable Speed：2100 rpm
Max Combined Output Flow：150 L/min
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-22℃ ~ +108℃
Sealing Grade：Multi-stage composite high-pressure seal, low internal leakage
Main Material：Stress-relief high-strength alloy cast iron housing, ion-nitrided piston & sliding shoe, precision ground valve plate
Net Weight：Approx 27.3KG
Application：Supply hydraulic power for boom, bucket and steering hydraulic circuits

Applicable Models

This hydraulic main pump is aftermarket replacement spare part:
• Komatsu WA380-6, WA430-6 wheel loader

Application Scenarios

708-1W-41570 main pump adapts to heavy cyclic loading tasks of 6 series wheel loaders:
• Quarry site: Hard rock aggregate excavation and truck loading.
• Concrete batching plant: Continuous feeding of sand and gravel raw materials.
• Bulk material yard: Stacking and transfer of coal and mineral materials.
• Road construction project: Earth filling and site leveling work.
• Port cargo terminal: High-cycle bulk cargo handling.

advantage

• Power sensing control with electronic proportional feedback, automatically limit torque to avoid engine stall during heavy digging, optimally match engine power output and reduce fuel consumption under continuous heavy load.
• Integrated main and pilot oil passage design, reduce pipeline connections and lower leakage risk, simplifying pump chamber layout and shortening assembly time.
• Stress-relief cast iron pump body, excellent anti-fatigue performance under repeated impact loading, resistant to vibration generated by frequent loading operations.
• Ion nitrided piston and sliding shoe assembly, stable wear resistance even with slightly polluted hydraulic oil, effectively extending the service life of core friction components.
• Precision ground valve plate, keep stable internal leakage after thousands of working hours, maintaining consistent hydraulic output in long-term operation.
• Multi-stage composite sealing system, reliable sealing performance in dusty quarry and material yard environment, good tolerance to temperature fluctuation.
• Standard original mounting dimension, convenient field replacement and shorten machine downtime, fully compatible with original installation positions.

FAQ 

Q1: Which machine does 708-1W-41570 hydraulic pump fit?
A1: This main hydraulic pump is suitable for Komatsu WA380-6 and WA430-6 wheel loaders. Confirm machine serial number before purchase to avoid wrong part selection.

Q2: What is the difference between power sensing pump and load sensing pump?
A2: Load sensing pump responds to flow demand of control valves. Power sensing pump monitors input torque, prioritizes matching engine power, better for continuous heavy loading to prevent engine stall.

Q3: What are typical failure symptoms of this hydraulic pump?
A3: Common faults: Bucket digging force decreases; engine stalls when digging compacted material; boom lifting speed drops under heavy load; abnormal grinding noise; oil seepage at pump shaft.

Q4: What preparations should be completed before pump installation?
A4: Release residual hydraulic pressure, fully clean hydraulic tank and pipelines, replace hydraulic oil and return filter. Inspect pressure sensor, main relief valve and hydraulic hoses. After assembly, bleed air and test power limit performance under loaded state.

Q5: After pump replacement, loader still stalls when digging hard material, what are the possible causes?
A5: Engine stall during digging may not be caused by main pump. Check improper power sensing setting, blocked hydraulic filter, aging relief valve, damaged pressure sensor or worn cylinder seals.

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