708-1W-00901 Hydraulic Pump For Komatsu PC800 excavator

708-1W-00901 Hydraulic Pump For Komatsu PC800 excavator Featured Image
  • 708-1W-00901 Hydraulic Pump For Komatsu PC800 excavator

Short Description:

708-1U-00241 is a variable axial piston main hydraulic pump engineered for Komatsu WA380-5 wheel loader.

Product Detail

Product Tags

description

This dual variable piston pump adopts CLSS closed load sensing control. Two pump units operate independently to supply oil for different working circuits. When executing composite movements such as lifting boom while digging, the pump distributes flow reasonably according to load demand without obvious speed drop. Built-in pressure and power dual limiting structure prevents overload damage under sudden rock impact.
The pump housing adopts ultra-high strength alloy cast iron, specially reinforced to resist continuous heavy impact in mining sites. The piston and sliding shoe assembly uses high temperature quenched alloy material, good wear resistance under high pressure and harsh oil pollution conditions. The paired valve plate adopts surface plasma hardening treatment to reduce friction loss. Multi-group combined sealing assembly resists dust and high temperature variation in open pit environment.
All finished pumps pass bench tests including composite action response, power limit calibration, continuous heavy load fatigue and long-time leakage inspection. Original mounting hole layout and spline interface support direct installation without modification.

product parameters

Part No：708-1W-00901
Product Type：Dual Variable Axial Piston Main Pump with CLSS Closed Load Sensing
Applicable Equipment：Komatsu PC800-8, PC850-8 Mining Excavator
Core Technology：CLSS closed load sensing, dual pump independent regulation, power & pressure limiting
Theoretical Displacement：2×110 cc/rev
Rated Working Pressure：34 MPa (340 bar)
Max Instantaneous Peak Pressure：37.5 MPa (375 bar)
Rated Working Speed：1800 rpm
Max Allowable Speed：2000 rpm
Max Combined Output Flow：360 L/min
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-22℃ ~ +110℃
Sealing Grade：Multi-combined high-pressure seal, low internal leakage
Main Material：Reinforced high-strength alloy cast iron housing, plasma hardened valve plate, quenched alloy piston & sliding shoe
Net Weight：Approx 38.5KG
Application：Supply hydraulic power for boom, arm, bucket, swing and travel hydraulic circuits

Applicable Models

This hydraulic main pump is aftermarket replacement spare part:
• Komatsu PC800-8, also compatible with PC850-8

Application Scenarios

708-1W-00901 main pump is built for heavy-duty mining excavation:
• Open pit mining: Hard rock blasting excavation and overburden stripping.
• Large quarry operation: Massive rock excavation and stockpile loading.
• Large earthmoving project: Heavy soil and rock mass excavation.
• Port bulk terminal: Large-scale ground leveling and material handling.
• Infrastructure foundation: Deep foundation pit rock excavation.

advantage

• CLSS closed load sensing system, dual-pump independent flow distribution, stable speed during composite digging actions.
• Built-in power and pressure dual limiting protection, buffer sudden rock impact and protect hydraulic components.
• Reinforced high-strength cast iron pump body, excellent shock resistance for heavy mining rock excavation.
• Plasma hardened valve plate and quenched piston sliding shoe set, long service life under continuous high pressure.
• Multi-group high-pressure composite sealing structure, reliable performance under high temperature and dusty open pit conditions.
• Large combined flow output, improve cycle efficiency for rock loading and stripping work.
• Standard original mounting dimension, convenient field replacement and shorten mining equipment downtime.

FAQ 

Q1: Which machine does 708-1W-00901 hydraulic pump fit?
A1: This dual main pump is suitable for Komatsu PC800-8 mining excavator and also compatible with PC850-8. Confirm machine serial number before purchase to avoid wrong part selection.

Q2: What is the feature of CLSS closed load sensing system?
A2: CLSS can detect load pressure in real time and adjust pump output automatically. It ensures stable speed for multiple actuators working at the same time, reducing energy loss compared with traditional open load sensing system.

Q3: What are typical failure symptoms of this hydraulic pump?
A3: Common faults: Insufficient rock digging force; composite action speed drops sharply; abnormal knocking noise under heavy load; high hydraulic oil temperature; obvious internal leakage and power loss.

Q4: What preparations should be completed before pump installation?
A4: Fully release residual hydraulic pressure, clean hydraulic tank and all pipelines completely, replace hydraulic oil and main return filter. Inspect main relief valve, pressure sensors and hydraulic hoses. After assembly, bleed air and test single and composite actions under loaded condition.

Q5: After pump replacement, excavator still has slow speed when performing composite digging action, what are the possible causes?
A5: Slow composite action may not be caused by main pump. Check pressure sensor failure, clogged hydraulic filter, worn control valve spool, trapped air inside hydraulic circuit or improper power limit setting.

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