708-1T-00540 Hydraulic Pump For Komatsu D51EX/PX bulldozer

708-1T-00540 Hydraulic Pump For Komatsu D51EX/PX bulldozer Featured Image
  • 708-1T-00540 Hydraulic Pump For Komatsu D51EX/PX bulldozer

Short Description:

708-1T-00472 is a temperature-controlled axial piston fan pump for Komatsu D155A-6 heavy bulldozer. It forms a complete cooling hydraulic system matched with fan motor.

Product Detail

Product Tags

description

This load-sensing axial piston pump features pressure and flow dual regulation. When multiple hydraulic actions operate simultaneously, the pump distributes oil flow reasonably to ensure coordinated movement of the working mechanism. The pressure cutoff function protects the hydraulic system from overload damage. The pump body adopts high-density cast iron with precision machining. The piston assembly uses high-strength wear-resistant alloy paired with anti-friction sliding shoes, lowering wear under continuous cyclic operation. The valve plate is made of special friction material to improve lubrication performance and reduce internal leakage. The sealing kit adopts high temperature resistant rubber composite material, resisting oil aging and external mud contamination. Each pump undergoes strict bench testing for load response, pressure holding and leakage performance. Original port layout and mounting dimensions guarantee direct installation without modification.

product parameters

Part No：708-1T-00540
Product Type：Load Sensing Variable Axial Piston Hydraulic Main Pump
Applicable Equipment：Komatsu D51EX, D51PX Medium Bulldozer
Core Technology：Load sensing variable control, pressure overload protection
Theoretical Displacement：76 cc/rev
Rated Working Pressure：20.5 MPa (205 bar)
Max Instantaneous Peak Pressure：24 MPa (240 bar)
Rated Working Speed：1850 rpm
Max Allowable Speed：2200 rpm
Max Output Flow：132 L/min
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-22℃ ~ +105℃
Sealing Grade：High-performance composite seal, low internal leakage
Main Material：High density cast iron housing, alloy piston & sliding shoe assembly, friction valve plate
Interchangeability：Direct replacement main pump for Komatsu D51EX/PX
Net Weight：Approx 23.8KG
Application：Supply hydraulic power for bulldozer blade, tilt and steering system

Applicable Models

This hydraulic pump is aftermarket replacement part, compatible with the following Komatsu medium bulldozer models:
• Komatsu D51EX
• Komatsu D51PX

Application Scenarios

708-1T-00540 main hydraulic pump is built for medium-duty construction environments, widely used in the following worksites of D51EX/PX bulldozer:
• Land leveling & site preparation: Farmland consolidation, construction site grading, road subbase trimming.
• Short-distance earthmoving: Light and medium soil pushing, stockpile levelling.
• Infrastructure construction: Small road projects, ditch excavation and slope finishing.
• Seasonal wet mud operation: Stable performance in humid and muddy ground conditions.
• Urban renovation projects: Compact working space construction with frequent start-stop operation.

advantage

• Load sensing variable control, dynamically match flow with actual load, reduce fuel consumption under light load.
• Built-in pressure cutoff protection, avoid system overload damage during sudden heavy load impact.
• Alloy piston and sliding shoe set, good wear resistance, stable performance for frequent compound movements.
• Special friction valve plate design, excellent lubrication property, effectively reduce internal leakage.
• High density cast iron housing, strong rigidity, resist deformation under pressure impact.
• High quality composite sealing assembly, resist mud and oil aging, extend service life in muddy sites.
• Standard mounting dimensions and oil ports, convenient field replacement, shorten machine downtime.

FAQ 

Q1: Which bulldozer fits 708-1T-00540 hydraulic pump?
A1: This main hydraulic pump is suitable for Komatsu D51EX and D51PX medium bulldozers. Verify machine serial number before purchase to prevent mismatching.

Q2: How does the load sensing function of this pump work?
A2: The pump detects pressure signal from working circuit. When the blade or steering system requires higher power, it increases displacement and flow. When load is low, it reduces output flow to save engine power.

Q3: What signs show the hydraulic main pump is worn or damaged?
A3: Typical faults: Weak pushing force; slow blade lifting/tilting; obvious power drop under load; abnormal knocking noise from pump housing; hydraulic oil overheating; continuous oil leakage.

Q4: What preparations should be done before pump installation?
A4: Flush the whole hydraulic system completely, replace hydraulic oil and filter element. Check control valve, hoses and pressure sensor for damage. After assembly, bleed air from hydraulic circuit and test pressure and action performance.

Q5: After replacing main pump, the bulldozer still lacks pushing power, what causes this?
A5: Insufficient dozing force may not be caused by main pump. Check relief valve pressure setting, worn cylinder seals, clogged hydraulic filter, damaged load sensing line or internal wear of control valve.

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