708-1U-00170/708-1U-00171 hydraulic pump For Komatsu WA380-6 wheel loader

708-1U-00170/708-1U-00171 hydraulic pump For Komatsu WA380-6 wheel loader Featured Image
  • 708-1U-00170/708-1U-00171 hydraulic pump For Komatsu WA380-6 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 variable piston pump integrates load sensing regulator and power limiting control. When bucket cuts into dense material pile, the pump automatically raises displacement and delivers high torque for digging. When the bucket travels light-load empty, it reduces flow output to save engine power and cut fuel consumption. The built-in anti-overload valve prevents sudden power surge from damaging hydraulic components.
The pump housing adopts high-density pearlite cast iron, resisting continuous impact from repeated bucket digging. The piston and sliding shoe assembly uses special anti-seize alloy, good lubrication performance under heavy load impact. The valve plate adopts surface hardening treatment to reduce wear under high pressure cycle. The multi-layer sealing group can resist dust and mineral oil degradation in long-hour continuous loading work.
All finished pumps pass bench tests including load response, power limit calibration and continuous cycle fatigue test. Original spline shaft and port layout support direct installation without modification.

product parameters

Part No：708-1U-00170 / 708-1U-00171
Product Type：Load Sensing Variable Axial Piston Main Hydraulic Pump
Applicable Equipment：Komatsu WA380-6, WA430-6 Wheel Loader
Core Technology：Load sensing control + power limiting protection
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：152 L/min
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-22℃ ~ +108℃
Sealing Grade：Multi-layer dust-proof composite seal, stable anti-wear property
Main Material：Pearlite cast iron housing, anti-seize alloy piston & sliding shoe, hardened valve plate
Installation Method：Flange mounting, spline drive shaft
Interchangeability：Direct replacement main pump for Komatsu WA380-6 / WA430-6
Net Weight：Approx 27.3KG
Application：Supply hydraulic power for loader boom, bucket, tilt and steering hydraulic circuits

Applicable Models

This hydraulic pump is aftermarket replacement spare part, compatible with the following Komatsu wheel loader model:
• Komatsu WA380-6, also fits WA430-6

Application Scenarios

708-1U-00170 /708-1U-00171 hydraulic main pump is customized for high-frequency loading cycle of wheel loader:
• Quarry aggregate loading: Rock fragment loading and continuous truck feeding.
• Bulk material yard work: Sand, gravel and coal stacking and stockpile rehandling.
• Port and terminal operation: Short-distance bulk cargo transfer and truck loading.
• Construction site material handling: Earth stockpiling, backfill and aggregate loading.
• Mine auxiliary works: Mine site road maintenance and ore stock loading.

advantage

• Load sensing and power limiting dual control, automatically match flow according to digging load, reduce fuel consumption during light-load travel.
• Built-in overload protection valve, buffer sudden pressure spike when bucket cuts into hard material pile, protect hydraulic system.
• Pearlite cast iron pump body, high structural rigidity, withstand frequent impact from repeated loading cycles.
• Anti-seize alloy piston and sliding shoe assembly, maintain stable lubrication under heavy shock loading.
• Surface hardened valve plate, slow down wear rate under long-time high-pressure continuous operation.
• Multi-layer dust-proof sealing system, reduce dust intrusion in open stockyard and quarry sites.
• Interchangeable two part numbers, flexible spare parts stocking, original mounting dimension for quick field replacement.

FAQ 

Q1: Which machine does 708-1U-00170 /708-1U-00171 hydraulic pump fit?
A1: This hydraulic main pump is designed for Komatsu WA380-6 wheel loader and compatible with WA430-6. Confirm machine serial number before purchase to avoid wrong selection.

Q2: What is the difference between these two part numbers?
A2: 708-1U-00170 and 708-1U-00171 are interchangeable upgraded versions. Minor internal structure optimization, same mounting size and performance parameters, can replace each other directly.

Q3: What are typical failure symptoms of this hydraulic pump?
A3: Common faults: Bucket digging force insufficient; boom lifting speed drops under heavy load; engine obvious power drop when cutting into stockpile; abnormal grinding noise under high pressure; continuous oil leakage at shaft seal.

Q4: What preparations should be completed before pump installation?
A4: Clean hydraulic tank and all pipelines completely, replace hydraulic oil and filter element. Inspect pressure sensor, main relief valve and hydraulic hoses. After assembly, bleed air inside hydraulic circuit and test loading and steering performance.

Q5: After pump replacement, loader still lacks digging force when cutting into material pile, what are the possible causes?
A5: Insufficient digging force may not be caused by main pump. Check relief valve pressure setting, worn cylinder seals, clogged hydraulic filter, damaged load sensing signal line or spool wear of control valve.

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