708-3S-11220 Hydraulic Pump For Komatsu WA430-6 wheel loader

708-3S-11220 Hydraulic Pump For Komatsu WA430-6 wheel loader Featured Image
  • 708-3S-11220 Hydraulic Pump For Komatsu WA430-6 wheel loader

Short Description:

708-1U-00170 and 708-1U-00171 are interchangeable variable axial piston main hydraulic pumps engineered for Komatsu WA380-6 wheel loader.

Product Detail

Product Tags

description

This fixed displacement pilot piston pump adopts built-in pressure limiting structure to keep pilot pressure within the designated range. Even when the main pump is under heavy digging load, the pilot circuit pressure remains unchanged, preventing control lag or heavy operation feel. The internal friction pair is optimized for low flow continuous operation, reducing heat generation during long shifts.
The pump housing adopts precision cast compact alloy, small footprint for limited installation space beside main pump. The piston and cam pair use anti-fatigue alloy material, resisting continuous tiny pressure pulsation. The integrated sealing group adopts low-friction shaft seal, resisting oil contamination and fine dust intrusion.
All finished pumps pass bench tests including constant pressure stability, continuous low-flow endurance and leakage inspection. Original mounting hole layout and spline interface support direct installation without modification.

product parameters

Part No：708-3S-11220
Product Type：Fixed Displacement Piston Pilot Hydraulic Pump
Applicable Equipment：Komatsu WA430-6 Wheel Loader
Core Technology：Constant pressure output, independent pilot oil supply
Theoretical Displacement：11 cc/rev
Rated Working Pressure：3.2 MPa (32 bar)
Max Instantaneous Peak Pressure：4.5 MPa (45 bar)
Rated Working Speed：1800 rpm
Max Allowable Speed：2200 rpm
Max Output Flow：22 L/min
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-22℃ ~ +102℃
Sealing Grade：Low friction integrated composite seal, minor leakage
Main Material：Compact precision cast alloy housing, anti-fatigue alloy piston & cam pair
Installation Method：Flange mounting, spline drive shaft
Net Weight：Approx 6.8KG
Application：Supply pilot pressure oil for boom, bucket and steering control valves

Applicable Models

This hydraulic pilot pump is aftermarket replacement spare part, matched for the following Komatsu wheel loader:
• Komatsu WA430-6

Application Scenarios

708-3S-11220 pilot pump is designed to sustain stable pilot control for wheel loader continuous loading jobs:
• Quarry aggregate loading: Long-hour cyclic loading with continuous lever operation.
• Bulk material yard work: Sand, gravel and coal stacking and stockpile rehandling.
• Port material transfer: Continuous truck loading under high-frequency operation.
• Construction site material handling: Earth stockpiling and aggregate feeding.
• Mine auxiliary haul road maintenance: Frequent switch between lifting and tilting actions.

advantage

• Independent pilot oil supply, stable control pressure unaffected by main pump heavy load fluctuation.
• Built-in pressure limiting structure, prevent overpressure damage to pilot control components.
• Compact alloy pump body, small size, easy installation in the crowded pump compartment.
• Anti-fatigue piston and cam friction pair, stable performance under long-time continuous operation.
• Low friction shaft seal design, reduce oil seepage risk under dusty stockyard environment.
• Low heat generation feature, slow down hydraulic oil aging during all-day loading operation.
• Original spline and mounting hole design, simple field replacement and shorten machine downtime.

FAQ 

Q1: Which machine does 708-3S-11220 hydraulic pump fit?
A1: This is a pilot auxiliary pump for Komatsu WA430-6 wheel loader. Confirm machine serial number before purchase to avoid wrong part selection.

Q2: What is the difference between pilot pump and main hydraulic pump?
A2: The main pump provides high-pressure power for bucket and boom movement. The pilot pump only supplies low stable pressure oil to operate control valve spools, responsible for operation sensitivity.

Q3: What are typical failure symptoms of this pilot pump?
A3: Common faults: Control lever feels heavy; boom and bucket response lag; intermittent weak control; pilot pressure unstable; oil leakage at pump shaft.

Q4: What preparations should be completed before pump installation?
A4: Release residual pressure of hydraulic system, clean pilot pipeline, inspect pilot filter. After assembly, start machine and test pilot pressure and control response of boom and bucket.

Q5: After pilot pump replacement, loader control lever is still heavy, what are the possible causes?
A5: Heavy operation feel may not be caused by pilot pump. Check blocked pilot filter, damaged control valve spool, trapped air inside pilot circuit or worn control lever assembly.

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