708-1T-00472 Fan Pump For Komatsu D155A-6 bulldozer

708-1T-00472 Fan Pump For Komatsu D155A-6 bulldozer Featured Image
  • 708-1T-00472 Fan Pump For Komatsu D155A-6 bulldozer

Short Description:

708-7W-00021 is a variable displacement hydraulic fan motor engineered for Komatsu D275A-5 and D275A-5D heavy mining bulldozers.

Product Detail

Product Tags

description

This axial piston fan pump adopts integrated temperature regulator, independent of main working hydraulic circuit, so dozing operation will not interfere with cooling loop. When bulldozer runs under heavy load and temperature rises, pump increases output flow to speed up fan for stronger heat dissipation. When load drops and temperature reduces, it cuts flow to reduce parasitic power loss and save fuel consumption. The pump housing is high-strength alloy cast iron with wear-resistant surface treatment, resisting gravel dust impact and long-term vibration. Internal piston and swash plate components are precision carburized and ground, featuring low friction and stable volumetric efficiency. The sealing assembly uses multi-layer composite seal, resisting high temperature aging and hydraulic oil contamination. All finished pumps pass strict hydraulic bench tests including temperature response, flow characteristic and leakage inspection. Standard mounting holes and oil port layout support direct replacement without modification.

product parameters

Part No：708-1T-00472
Product Type：Temperature Controlled Axial Piston Fan Pump
Applicable Equipment：Komatsu D155A-6 Heavy Bulldozer
Core Technology：Built-in temperature sensing variable control
Theoretical Displacement：32 cc/rev
Rated Working Pressure：21 MPa (210 bar)
Max Instantaneous Peak Pressure：25 MPa (250 bar)
Rated Working Speed：1900 rpm
Max Allowable Speed：2300 rpm
Rated Output Flow：84 L/min
Minimum Idle Flow：19 L/min
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-25℃ ~ +108℃
Sealing Grade：Multi-layer composite seal, low internal & external leakage
Main Material：High strength alloy cast iron housing, carburized piston & swash plate assembly, composite sealing set
Net Weight：Approx 16.5KG
Application：Supply hydraulic power for D155A-6 bulldozer cooling fan motor

Applicable Models

This fan pump is OEM replacement part, perfectly compatible with Komatsu D155A-6 heavy bulldozer, used for aftermarket maintenance and replacement.
• Komatsu D155A-6

Application Scenarios

708-1T-00472 hydraulic fan pump is engineered for heavy-load, high-dust and strong-vibration harsh working conditions, widely used for D155A-6 bulldozer:
• Open-pit mining: Ore stripping, rock pushing and heavy earthmoving, stable temperature control under full-load continuous operation.
• Large earthwork projects: Land grading, road foundation construction and dam engineering, supporting long-hour non-stop operation.
• High-temperature summer construction: Stable cooling power for engineering sites in hot regions.
• Hard soil & gravel working sites: Reliable performance under high-resistance cutting and pushing tasks.

advantage

• Integrated temperature sensing variable design, independent cooling circuit, no signal interference with main hydraulic system.
• Alloy cast iron pump body with wear-resistant treatment, excellent shock and vibration resistance, adapted to dusty mine working environment.
• Precisely ground piston and swash plate assembly, stable volumetric efficiency and low wear rate during long cyclic operation.
• Multi-layer composite sealing system, anti high-temperature aging and effectively reduce oil leakage risk.
• Gentle flow adjustment curve, fan speed changes smoothly without sudden jump, lowering vibration of fan assembly.
• Standard flange and oil port layout, convenient on-site installation, no extra machining required.
• Complete bench performance test, stable operation under continuous heavy-duty dozing work.

FAQ 

Q1: Which machine does 708-1T-00472 fan pump fit?
A1: This hydraulic fan pump is specially designed for Komatsu D155A-6 heavy bulldozer. Confirm machine serial number before placing order to avoid wrong selection.

Q2: What is the working principle of this fan pump?
A2: Driven by engine power, the pump outputs pressure oil to drive fan motor. Built-in temperature sensing valve changes pump displacement according to coolant and hydraulic oil temperature, adjusting oil supply flow to control fan speed and keep equipment temperature within safe range.

Q3: What symptoms indicate fan pump failure?
A3: Common failure signs: Fan cannot speed up when temperature rises; unstable fan rotation speed; abnormal noise inside pump; insufficient oil supply leading to poor heat dissipation; oil leakage from pump body; slow response when temperature rises rapidly.

Q4: What preparations are needed before installation?
A4: Clean the cooling hydraulic circuit thoroughly, replace contaminated hydraulic oil and filter. Inspect fan motor, relief valve and pipeline for damage or blockage. After installation, bleed air from cooling circuit and test temperature response performance.

Q5: After replacing fan pump, machine still overheats, what are the possible reasons?
A5: Overheating problem may not come from fan pump. Check radiator clogging, fan motor wear, fan blade deformation, relief valve pressure offset, air trapped in hydraulic circuit or blocked filter element.

our warehouse

our warehouse

Pack and ship

Pack and ship


  • Previous:
  • Next:
    • Write your message here and send it to us

    Products categories