708-7W-00021 Fan Motor For Komatsu D275A-5D bulldozer

708-7W-00021 Fan Motor For Komatsu D275A-5D bulldozer Featured Image
  • 708-7W-00021 Fan Motor For Komatsu D275A-5D bulldozer

Short Description:

708-1T-00420 and 708-1T-00421 are interchangeable temperature-controlled axial piston fan pumps for Komatsu D275A-5, D275A-5D heavy-duty bulldozer.

Product Detail

Product Tags

description

This hydraulic fan motor is purpose-built for the severe vibration and dust environment of open-pit mines. It integrates speed feedback control, which can automatically reduce rotation speed when the system temperature drops, cutting parasitic power loss and reducing fuel consumption. When the bulldozer carries out heavy-duty rock cutting, rising temperature will trigger the motor to raise speed rapidly to boost air flow for heat dissipation.
The motor housing uses refined alloy cast iron with anti-corrosion coating, resisting dust erosion and impact from stone debris. Its internal rotating group adopts carburized alloy steel components with precision lapping treatment, reducing friction loss and extending service life under cyclic speed changes. The shaft sealing assembly adopts multi-stage composite sealing structure, resisting continuous high temperature and dust invasion inside engine compartment.

product parameters

Part No：708-7W-00021
Product Type：Variable Displacement Hydraulic Fan Motor
Applicable Equipment：Komatsu D275A-5, D275A-5D Heavy Mining Bulldozer
Core Technology：Built-in speed feedback control, temperature linked speed regulation
Theoretical Displacement：34 cc/rev
Rated Working Pressure：21.5 MPa (215 bar)
Max Instantaneous Peak Pressure：25.5 MPa (255 bar)
Rated Working Speed：1780 rpm
Max Allowable Speed：2250 rpm
Rated Output Torque：64 N·m
Minimum Stable Speed：280 rpm
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-26℃ ~ +110℃
Sealing Grade：Multi-stage composite shaft seal, low external leakage
Main Material：Refined alloy cast iron housing, carburized alloy rotating group, multi-layer composite seal
Installation Method：Flange mount, spline connection for fan blade
Interchangeability：Direct replacement fan motor for D275A-5 / D275A-5D cooling circuit

Applicable Models

This fan motor is factory-matched and fully compatible with the following Komatsu heavy-duty bulldozer models, supporting original equipment replacement and aftermarket repair:
• Komatsu D275A-5
• Komatsu D275A-5D

Application Scenarios

708-7W-00021 hydraulic fan motor is designed for high-load, high-temperature and dusty harsh working conditions, widely applicable to heavy-duty construction scenarios of D275A-5 series bulldozers:
• Open-pit mining operation: Continuous rock pushing, ore stripping and heavy earthmoving in open-pit mines, solving equipment overheating caused by long-term full-load operation.
• High-temperature field construction: Stable heat dissipation guarantee for summer high-temperature construction and desert arid area engineering.
• High-altitude engineering projects: Adapt to high-altitude low-pressure and large-temperature-difference environment, ensuring stable fan speed and balanced heat dissipation.
• Long-duration continuous shift work: Suitable for 24-hour uninterrupted construction of large earthwork projects, reducing thermal fatigue failure of hydraulic system and engine.
• Hard soil and rock foundation treatment: Effectively control temperature rise during high-resistance cutting and ripping operations to avoid power attenuation and shutdown failure.

advantage

• Variable displacement design with built-in speed feedback, real-time linkage with system temperature, reducing unnecessary power consumption during low-load operation.
• Alloy cast iron housing with anti-corrosion coating, strong dust and impact resistance, adapting to open-pit mine harsh working environment.
• Carburized alloy rotating assembly with precision lapping, stable torque output during frequent speed adjustment, lower internal friction and longer service cycle.
• Multi-layer composite shaft seal blocks dust and high-temperature radiation effectively, preventing oil leakage caused by particulate contamination.
• Smooth speed transition without sharp torque fluctuation, lowering fan blade fatigue and reducing overall system vibration.
• OEM spline and flange interface, quick on-site replacement, no modification required for fan assembly.
• Strict bench verification for speed response and torque performance, stable operation in long-shift mining continuous operation.

FAQ 

Q1: Which machine does 708-7W-00021 fan motor fit?
A1: This hydraulic fan motor is designed for Komatsu D275A-5 and D275A-5D heavy mining bulldozers. Verify machine serial number before ordering to confirm compatibility.

Q2: What is the operating principle of this fan motor?
A2: It receives pressure oil supplied by cooling fan pump. The built-in speed feedback structure adjusts motor displacement according to oil temperature signal, changes fan rotating speed to adjust air volume, maintains the engine and hydraulic oil temperature within safe operating range.

Q3: What signs indicate fan motor wear or failure?
A3: Typical symptoms: fan speed fails to rise when temperature spikes; irregular fan vibration; abnormal humming noise inside motor; insufficient torque leading to weak air flow; external oil seepage from shaft end; unstable low-speed rotation.

Q4: What preparation work is needed before installation?
A4: Clean the cooling hydraulic circuit thoroughly and replace contaminated hydraulic oil and filter element. Inspect fan blade for crack, deformation and dynamic balance issue. Check inlet pipeline for blockage. After installation, bleed trapped air in cooling circuit and test speed regulation performance.

Q5: After fan motor replacement, temperature still runs high, what are the causes?
A5: High temperature may not originate from fan motor. Check fan pump output capacity, radiator blockage by rock dust, fan blade damage, relief valve pressure drift, trapped air inside hydraulic circuit or clogged filter element.

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