708-7S-00550 Fan Motor For Komatsu WA380 wheel loader

708-7S-00550 Fan Motor For Komatsu WA380 wheel loader Featured Image
  • 708-7S-00550 Fan Motor For Komatsu WA380 wheel loader

Short Description:

708-7W-00140 is a variable speed hydraulic fan motor designed for Komatsu D155A-6 large bulldozer.

Product Detail

Product Tags

description

This hydraulic fan motor integrates a built-in high-precision proportional solenoid valve to realize stepless speed regulation, achieving real-time matching of heat dissipation capacity and equipment load. Internal rotor, piston and heavy-duty bearing components are processed by precision grinding technology to minimize running friction, achieving low vibration, low noise and ultra-stable rotation state during long continuous cyclic operation. The high-strength alloy cast housing features excellent structural rigidity, effectively resisting external impact, sand accumulation and dust invasion on harsh construction sites.
Adopting multi-group advanced composite sealing parts, the motor can cope with frequent hydraulic pressure fluctuations and wide ambient temperature changes throughout the year, effectively preventing internal hydraulic leakage and external oil seepage. All finished fan motors undergo strict bench tests including pressure resistance, speed regulation response, rotating stability and tightness inspection before delivery. The standard flange installation interface matches original assembly perfectly for direct replacement without cutting, drilling or any other mechanical modification.

product parameters

Part No：708-7S-00550
Interchangeable Part No：708-7S-11740
Product Type：Variable Speed Hydraulic Cooling Fan Motor
Applicable Equipment：Komatsu WA380-6 / WA430-6 / WA450-6 / WA470-6 / WA480-6 Wheel Loader
Core Technology：Proportional solenoid valve stepless intelligent speed control
Motor Displacement：12.5 cc/rev
Rated Working Pressure：22 MPa
Max Instantaneous Peak Pressure：26 MPa
Rated Speed：1850 rpm
Max Allowable Speed：2400 rpm
Min Idle Speed：600 rpm
Rated Output Torque：38 N·m
Speed Response Time：≤0.3s
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-25℃ ~ +110℃
Applicable Altitude：≤3000m
Sealing Type：Multi-composite high pressure wear-resistant seal
Internal Leakage Standard：≤1.5 L/min (rated pressure)
Axial Rotor Clearance：0.015mm precision tolerance
Main Material：Alloy cast housing, hardened integral rotor, heavy-duty wear-resistant bearing
Installation Method：Flange mounting, fixed bolt hole positioning
Application：Radiator fan drive for wheel loader engine and hydraulic system cooling

Applicable Models

This hydraulic fan motor is aftermarket replacement spare part:
• Komatsu WA380-6 wheel loader
• Komatsu WA430-6, WA450-6 wheel loader
• Komatsu WA470-6, WA480-6 wheel loader

Application Scenarios

This fan motor is designed for wheel loader heavy-duty operation scenarios:
• Quarry site: Continuous rock loading, stockpile handling and material transportation.
• Sand and gravel yard: Long-cycle bulk aggregate loading and stacking work.
• Mining project: Ore loading under high temperature and dusty environment.
• Road construction project: Material handling and site foundation backfilling.
• Port and terminal: High frequency uninterrupted bulk cargo loading operation.

advantage

• Built-in proportional solenoid valve can automatically adjust fan speed according to coolant and hydraulic oil temperature, reduce unnecessary power loss and lower fuel consumption during light-load standby operation.
• Precision hardened rotor and heavy-duty bearing assembly maintain stable rotary performance, resist abrasive wear from sand and dust, and extend service life under frequent cyclic loading conditions.
• High-strength alloy cast housing features good shock resistance, protecting internal core components from collision damage during loading and bumpy site travel.
• Multi-layer composite sealing structure maintains stable sealing effect under fluctuating pressure and temperature, effectively lowering the probability of internal leakage and external hydraulic oil seepage.
• Good interchangeability with alternative part number 708-7S-11740, supporting flexible spare parts stocking and simplifying inventory management for distributors and maintenance suppliers.
• Standard flange mounting dimensions fully match original installation position, supporting direct on-site replacement without machining modification, reducing equipment downtime and improving overall construction operation efficiency.

FAQ 

Q1: Which loader does 708-7S-00550 fan motor fit?
A1: It mainly fits Komatsu WA380-6 wheel loader, also compatible with WA430-6, WA450-6, WA470-6 and WA480-6 models. Confirm machine serial number before purchase.

Q2: What abnormal signs indicate the fan motor needs replacement?
A2: Fan rotation with obvious abnormal noise, fan speed cannot respond to temperature change, oil leakage at motor housing, and engine overheating under heavy loading operation.

Q3: What is the interchangeable part number for this fan motor?
A3: 708-7S-00550 can be replaced by 708-7S-11740 for the same series wheel loaders.

Q4: What preparations should be completed before installing the fan motor?
A4: Release residual hydraulic pressure, clean hydraulic pipelines, inspect hydraulic oil quality and filter condition. After assembly, bleed air from hydraulic circuit and test fan speed regulation function.

Q5: The engine still overheats after replacing the fan motor, what should we check?
A5: Inspect radiator blockage, hydraulic oil viscosity, solenoid valve signal, fan blade damage and water pump status. Engine overheating issue may not be caused only by fan motor failure.

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