708-1U-00280 Hydraulic Pump For Komatsu GD705-5 motor grader

708-1U-00280 Hydraulic Pump For Komatsu GD705-5 motor grader Featured Image
  • 708-1U-00280 Hydraulic Pump For Komatsu GD705-5 motor grader

Short Description:

708-1U-00161 is a variable axial piston hydraulic pump developed for Komatsu WB93R backhoe loader, compatible with WB93R-5E0, WB97R and WB97S series.

Product Detail

Product Tags

description

This variable piston pump uses pressure-flow compound regulator. It can maintain stable pressure while delivering small flow during fine grading, realizing smooth micro-movement of the grader blade. When heavy cutting is required, the pump instantly increases displacement and flow to provide strong cutting force. Built-in anti-surge valve suppresses pressure fluctuation during frequent blade adjustment.
The pump housing adopts high toughness alloy cast iron, resisting continuous vibration generated by blade contact with hard subgrade. The piston assembly uses vacuum quenching alloy material, improving wear resistance under long-term micro cyclic load. The valve plate adopts asymmetric oil port design, reducing pulsation during low-flow precise adjustment. The sealing set adopts multi-component rubber, resisting temperature change and dust invasion in open-air construction.
All finished pumps pass bench tests including micro-flow response, pressure holding stability and long-time pulsation endurance. Original mounting dimensions and spline shaft structure support direct installation without modification.

product parameters

Part No：708-1U-00280
Product Type：Pressure-Flow Compound Control Variable Axial Piston Main Pump
Applicable Equipment：Komatsu GD705-5 Motor Grader
Core Technology：Pressure-flow compound regulation, pressure surge suppression
Theoretical Displacement：90 cc/rev
Rated Working Pressure：22 MPa (220 bar)
Max Instantaneous Peak Pressure：26.5 MPa (265 bar)
Rated Working Speed：1700 rpm
Max Allowable Speed：2050 rpm
Max Output Flow：146 L/min
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-22℃ ~ +105℃
Sealing Grade：Multi-component dust-proof composite seal, low flow pulsation
Main Material：High toughness alloy cast iron housing, vacuum quenched alloy piston, asymmetric port valve plate
Installation Method：Flange mounting, spline drive shaft
Interchangeability：Direct replacement main pump for Komatsu GD705-5 grader
Net Weight：Approx 26.1KG
Application：Supply hydraulic power for grader blade, circle and steering hydraulic circuits

Applicable Models

This hydraulic pump is aftermarket replacement spare part, exclusively matched for the following Komatsu motor grader:
• Komatsu GD705-5

Application Scenarios

708-1U-00280 hydraulic main pump is customized for high-precision leveling work of motor grader:
• Highway base construction: Subgrade leveling, slope trimming and road shoulder shaping.
• Municipal road projects: Asphalt base fine grading, curb foundation trimming.
• Airport and large yard works: Large-area site leveling with long continuous grading.
• Rural road reconstruction: Undulating ground finishing and ditch slope repair.
• Mining site maintenance: Haul road resurfacing and rut repair.

advantage

• Pressure-flow compound control, stable micro-flow output for fine grading, smooth blade micro adjustment.
• Built-in pressure surge suppression structure, reduce hydraulic pulsation during frequent blade fine tuning.
• High toughness alloy cast iron pump body, strong vibration resistance for continuous contact with hard ground.
• Vacuum quenched alloy piston set, stable performance under long-term repeated small load cycle.
• Asymmetric port valve plate design, lower flow pulsation and improve surface flatness during grading.
• Multi-component dust-proof sealing assembly, adapt to open-air dusty road construction environment.
• Original spline and mounting hole layout, convenient field replacement and shorten construction downtime.

FAQ 

Q1: Which machine does 708-1U-00280 hydraulic pump fit?
A1: This hydraulic main pump is specially designed for Komatsu GD705-5 motor grader. Verify machine serial number before purchase to avoid wrong selection.

Q2: What is the characteristic of pressure-flow compound control for grader application?
A2: It prioritizes pressure stability under small flow for fine grading. When encountering hard soil and heavy cutting, it automatically increases flow and power to ensure sufficient cutting force without pressure drop.

Q3: What are typical failure symptoms of this hydraulic pump?
A3: Common faults: Blade jitter during fine leveling; insufficient cutting force on hard ground; unstable working pressure; obvious hydraulic pulsation; gradual oil leakage at shaft seal.

Q4: What preparations should be completed before pump installation?
A4: Clean hydraulic tank and pipelines completely, replace hydraulic oil and filter element. Inspect pressure control valve, steering circuit and hydraulic hoses. After assembly, bleed air and test both fine grading and heavy cutting performance.

Q5: After pump replacement, grader blade still shakes during fine leveling, what are the possible causes?
A5: Blade jitter may not be caused by main pump. Check accumulator condition, relief valve pressure setting, worn cylinder seals, trapped air inside circuit or worn control valve spool.

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