708-1U-00112 Hydraulic Pump For Komatsu WB93R backhoe loader

708-1U-00112 Hydraulic Pump For Komatsu WB93R backhoe loader Featured Image
  • 708-1U-00112 Hydraulic Pump For Komatsu WB93R backhoe loader

Short Description:

708-1T-00580 is an axial piston variable fan pump engineered for Komatsu PC490-10 large hydraulic excavator.

Product Detail

Product Tags

description

This compound variable piston pump integrates dual load-sensing regulators to independently respond to the pressure signal of front loader and rear backhoe circuits. When both ends work simultaneously, the pump distributes flow rationally without obvious action lag. The built-in power limiting function restricts total output power to prevent engine overload.The pump housing adopts cast alloy with enhanced stress relief treatment, resisting frequent pressure impact caused by alternating digging and loading operations. The piston and valve plate set uses special matched friction pairs, improving anti-sticking performance under mixed dirt and water environment. The sealing assembly adopts multi-stage anti-pollution sealing structure, effectively blocking sediment and moisture intrusion.
Each finished pump passes strict bench tests including compound action response, power limit calibration and long-duration leakage inspection. Original mounting dimension and spline shaft structure support direct replacement without modification.

product parameters

Part No：708-1U-00112
Product Type：Compound Variable Axial Piston Main Hydraulic Pump
Applicable Equipment：Komatsu WB93R Backhoe Loader
Core Technology：Dual load sensing regulation, total power limiting protection
Theoretical Displacement：82 cc/rev
Rated Working Pressure：21 MPa (210 bar)
Max Instantaneous Peak Pressure：25.5 MPa (255 bar)
Rated Working Speed：1750 rpm
Max Allowable Speed：2100 rpm
Max Combined Output Flow：138 L/min
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-20℃ ~ +104℃
Sealing Grade：Multi-stage anti-pollution composite seal, low internal leakage
Main Material：Stress-relieved alloy cast housing, matched alloy piston & valve plate friction pair
Net Weight：Approx 24.6KG
Application：Supply hydraulic power for front loader and rear backhoe working system

Applicable Models

This hydraulic pump is aftermarket replacement spare part, compatible with the following Komatsu backhoe loader model:
• Komatsu WB93R

Application Scenarios

708-1U-00112 hydraulic main pump is designed for multi-functional mixed operation conditions of backhoe loader, widely used in these jobsites:
• Municipal engineering works: Trenching, pipe laying, roadside repair and small foundation backfilling.
• Farmland renovation: Ditch digging, soil stacking and field access road construction.
• Residential site construction: Small-scale earthmoving, foundation excavation and material loading.
• Emergency repair projects: Road collapse cleanup, short-distance debris handling with frequent switch between digging and loading.
• Rural infrastructure: Flexible operation in narrow sites with frequent start-stop and compound movements.

advantage

• Dual load sensing control, synchronous supply for loader and backhoe, small action lag during combined operation.
• Built-in total power limiting protection, avoid engine stall under simultaneous heavy load of front and rear devices.
• Stress-relieved alloy pump body, good fatigue resistance under alternating pressure impact.
• Special matched friction pair design, reduce risk of piston seizure in muddy construction sites.
• Multi-stage anti-pollution sealing system, block sediment ingress and extend service life in dirty working conditions.
• Integrated compact structure, save installation space inside backhoe loader.
• Original spline and port layout, convenient field replacement and shorten equipment downtime.

FAQ 

Q1: Which machine does 708-1U-00112 hydraulic pump fit?
A1: This hydraulic main pump is designed for Komatsu WB93R backhoe loader. Confirm machine serial number before purchase to prevent wrong selection.

Q2: What is the function of total power limiting of this pump?
A2: The pump monitors total absorbed power. When front loader and rear backhoe work together and total power exceeds engine capacity, the pump automatically reduces displacement to avoid engine stall.

Q3: What are typical failure symptoms of this hydraulic pump?
A3: Common faults: Loading or digging power insufficient; one side action slow while the other side normal; obvious engine stall under compound heavy load; abnormal grinding noise inside pump; gradual oil leakage at shaft seal.

Q4: What preparations should be completed before pump installation?
A4: Clean the whole hydraulic tank and pipeline thoroughly, replace hydraulic oil and filter element. Inspect pressure sensors, control valve and hoses for clogging or damage. After assembly, bleed air and test both loading and digging actions separately.

Q5: After pump replacement, backhoe loader still lacks power during combined operation, what are the possible causes?
A5: Insufficient compound power may not be caused by main pump. Check power limit setting, worn cylinder seals, clogged hydraulic filter, damaged load sensing signal lines or spool wear in control valve.

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