708-1W-00491 Hydraulic Pump For Komatsu WA380 wheel loader

708-1W-00491 Hydraulic Pump For Komatsu WA380 wheel loader Featured Image
  • 708-1W-00491 Hydraulic Pump For Komatsu WA380 wheel loader

Short Description:

708-3S-11220 is a compact fixed displacement piston pilot pump developed for Komatsu WA430-6 wheel loader.

Product Detail

Product Tags

description

This variable piston pump adopts hydraulic torque sensing regulator. It monitors output pressure and displacement in real time to limit absorbed torque, so the pump will not exceed engine output capacity under sudden heavy load. When the bucket cuts into compacted material pile, the pump maintains high torque output; during empty return travel, it reduces displacement to cut power consumption and fuel consumption.
The pump housing uses high-strength alloy cast iron with internal stress relief treatment, resisting cyclic pressure shock under heavy loading. The piston and shoe friction pair adopts vacuum ion nitriding treatment, improving wear resistance under high pressure and contaminated oil conditions. The valve plate uses special curved surface matching technology to reduce internal leakage during long continuous shift. A combined multi-stage sealing assembly is adopted to resist dust and hydraulic oil aging.
All finished pumps pass bench tests including torque limit calibration, full-cycle fatigue test and long-duration leakage inspection. Original spline shaft and port layout support direct installation without modification.

product parameters

Part No：708-1W-00491
Product Type：Hydraulic Torque Sensing Variable Axial Piston Main Pump
Applicable Equipment：Komatsu WA380-7, WA380-8 Wheel Loader
Core Technology：Hydraulic torque sensing regulation, automatic power limiting
Theoretical Displacement：98 cc/rev
Rated Working Pressure：23 MPa (230 bar)
Max Instantaneous Peak Pressure：27.5 MPa (275 bar)
Rated Working Speed：1850 rpm
Max Allowable Speed：2150 rpm
Max Combined Output Flow：156 L/min
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-23℃ ~ +110℃
Sealing Grade：Multi-stage composite dust-proof seal, low internal leakage
Main Material：Stress-relief high-strength alloy cast iron housing, ion-nitrided piston & sliding shoe, curved surface matched valve plate
Installation Method：Flange mounting, spline drive shaft
Net Weight：Approx 28.2KG
Application：Supply hydraulic power for loader boom and bucket hydraulic circuits

Applicable Models

This hydraulic pump is aftermarket replacement spare part for Komatsu wheel loader:
• Komatsu WA380-7 / WA380-8

Application Scenarios

708-1W-00491 hydraulic main pump adapts to heavy-load loading scenarios of modern wheel loaders:
• Quarry site: Hard rock aggregate loading and stockpile rehandling.
• Concrete batching plant: Continuous sand and gravel feeding.
• Waste and recycling yard: Bulk waste stacking and transfer.
• Road construction projects: Earth filling, material stockpiling and site cleanup.
• Port bulk cargo yard: High-volume continuous loading operation.

advantage

• Hydraulic torque sensing control, automatically match torque output according to load, effectively prevent engine stall during heavy digging.
• Built-in automatic power limiting function, protect hydraulic system from pressure spike damage under sudden overload.
• Stress-relief high-strength cast iron pump body, excellent fatigue resistance under repeated heavy impact loading.
• Ion nitrided piston and sliding shoe assembly, stable wear resistance even with slightly contaminated hydraulic oil.
• Curved surface matched valve plate, maintain low internal leakage after thousands of working hours.
• Multi-stage composite dust-proof sealing system, adapt to harsh dusty environment of quarry and stockyard.
• Original spline and port layout, convenient field replacement and shorten machine downtime.

FAQ 

Q1: Which machine does 708-1W-00491 hydraulic pump fit?
A1: This hydraulic main pump is designed for Komatsu WA380-7 and WA380-8 wheel loaders. Confirm machine serial number before purchase to avoid wrong part selection.

Q2: What is the difference between torque sensing pump and traditional load sensing pump?
A2: Load sensing pump mainly responds to flow demand from working valves. Torque sensing pump directly limits the torque absorbed by pump, prioritizes engine protection, and avoids engine stall when facing sudden heavy load.

Q3: What are typical failure symptoms of this hydraulic pump?
A3: Common faults: Bucket digging force insufficient; engine tends to stall when cutting into dense material pile; boom lifting speed drops under heavy load; abnormal grinding noise under high pressure; gradual oil leakage at shaft seal.

Q4: What preparations should be completed before pump installation?
A4: Clean hydraulic tank and all pipelines thoroughly, replace hydraulic oil and return filter. Inspect main relief valve, pressure sensor and hydraulic hoses. After assembly, bleed air and test torque limit performance under loaded condition.

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 torque limit setting, blocked hydraulic filter, worn cylinder seals, damaged pressure signal line or aging main relief valve.

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