708-1U-00161 Hydraulic Pump For Komatsu WB93R backhoe loader

708-1U-00161 Hydraulic Pump For Komatsu WB93R backhoe loader Featured Image
  • 708-1U-00161 Hydraulic Pump For Komatsu WB93R backhoe loader

Short Description:

708-1U-00112 is a compound variable axial piston hydraulic pump specially developed for Komatsu WB93R backhoe loader.

Product Detail

Product Tags

description

This variable piston pump integrates electronic proportional regulator and pressure compensation valve. It can adjust pump displacement according to the pressure signal from multiple working circuits. When the operator switches between digging and loading operations, the pump quickly adjusts flow output without obvious power drop. Built-in pressure shock suppression structure reduces hydraulic impact when cylinders start and stop.
The pump housing uses refined nodular cast iron with good shock absorption performance. The piston assembly uses surface nitriding treatment, improving wear resistance under variable pressure cycles. The valve plate adopts high-precision curved surface matching technology, reducing internal leakage during long-time continuous operation. The shaft seal assembly adopts double-layer anti-extrusion sealing structure, resisting hydraulic oil impact and external mud splashing.

product parameters

Part No：708-1U-00161
Product Type：Electronically Controlled Variable Axial Piston Main Hydraulic Pump
Applicable Equipment：Komatsu WB93R, WB93R-5E0, WB97R, WB97S Backhoe Loader
Core Technology：Electronic proportional regulation + pressure shock suppression
Theoretical Displacement：86 cc/rev
Rated Working Pressure：21.5 MPa (215 bar)
Max Instantaneous Peak Pressure：26 MPa (260 bar)
Rated Working Speed：1780 rpm
Max Allowable Speed：2150 rpm
Max Combined Output Flow：144 L/min
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-21℃ ~ +106℃
Sealing Grade：Double-layer anti-extrusion seal, stable leakage control
Main Material：Nodular cast iron housing, nitrided alloy piston, curved surface friction valve plate
Net Weight：Approx 25.2KG
Application：Supply hydraulic power for loader, backhoe and steering hydraulic circuits

Applicable Models

This hydraulic pump is aftermarket replacement spare part, compatible with the following Komatsu backhoe loader models:
• Komatsu WB93R / WB93R-5E0
• Komatsu WB97R / WB97S

Application Scenarios

708-1U-00161 hydraulic main pump is optimized for variable load and frequent direction switching conditions of backhoe loader:
• Municipal pipeline works: Trench excavation, pipe laying and backfilling with continuous direction switching.
• Highway maintenance: Road shoulder repair, slope trimming and debris cleanup along roads.
• Farm water conservancy: Irrigation channel digging, pond dredging and earth stockpiling.
• Small building projects: Foundation excavation, material loading and site cleanup.
• Remote field works: Adapt to unstable power load under bumpy and uneven ground.

advantage

• Electronic proportional control, rapid flow adjustment when switching digging and loading actions, less power loss during transition.
• Built-in pressure shock suppression structure, reduce hydraulic impact and extend service life of cylinders and pipelines.
• Nodular cast iron pump body, strong damping ability, reduce vibration transmission to machine frame.
• Nitrided alloy piston set, stable wear resistance under frequent pressure fluctuation.
• Curved surface matched valve plate, keep low internal leakage after thousands of working hours.
• Double-layer anti-extrusion shaft seal, resist mud splashing and prevent oil leakage at shaft end.
• Original electric connector and mounting hole design, convenient on-site replacement without wiring modification.

FAQ 

Q1: Which machine does 708-1U-00161 hydraulic pump fit?
A1: This hydraulic main pump fits Komatsu WB93R, WB93R-5E0, WB97R and WB97S backhoe loaders. Confirm machine serial number before purchase to avoid wrong selection.

Q2: What is the difference between this pump and ordinary load sensing pump?
A2: It adopts electronic proportional control. It can pre-adjust displacement according to signal change, response faster than traditional load sensing pump, and reduce hydraulic shock during action switching.

Q3: What are typical failure symptoms of this hydraulic pump?
A3: Common faults: Power lag when switching between digging and loading; obvious hydraulic shock when cylinder starts; unstable working pressure; oil leakage at shaft end; pump body abnormal noise under high pressure.

Q4: What preparations should be completed before pump installation?
A4: Clean hydraulic tank and all pipelines thoroughly, replace hydraulic oil and filter. Check electronic control wiring, pressure sensors and relief valve. After assembly, bleed air and test proportional response of multiple working actions.

Q5: After pump replacement, backhoe loader still has hydraulic shock during operation, what are the possible causes?
A5: Hydraulic shock may not be caused by main pump. Check pipeline fixing, accumulator performance, relief valve setting, worn cylinder buffer seal or incorrect electronic control signal calibration.

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