The cooling fan plays an important role in maintaining the proper operating temperature of a wheel loader. When the hydraulic fan motor becomes worn or fails, problems such as high coolant temperature, increased hydraulic oil temperature, abnormal noise and fan stoppage may occur.
The Komatsu fan motor 708-7S-00520 is a hydraulic fan motor assembly designed for several Komatsu wheel loaders, including WA380-5, WA400-5, WA430-5, WA470-5 and WA480-5. It is also interchangeable with 708-7S-00530.
How the Fan Motor Works
The hydraulic fan motor converts hydraulic power into fan rotation to support the machine's cooling system. The 708-7S-00520 can control fan speed and reverse fan rotation, allowing accumulated dust and debris around the radiator to be removed during operation.
This function is particularly useful for wheel loaders working in dusty construction, mining and material-handling environments. Keeping the radiator clean helps maintain airflow and supports stable cooling performance.
Common Signs of Fan Motor Failure
A damaged fan motor may affect the cooling system before the machine stops completely. Common symptoms include:
High coolant or water temperature
Increased hydraulic oil temperature
Cooling fan not operating normally
Unusual noise from the fan system
Hydraulic oil leakage
If these symptoms appear, checking the fan motor, hydraulic circuit and related components can help identify the source of the problem.
Choosing the Right Replacement
Before purchasing a 708-7S-00520 fan motor, it is important to confirm the wheel loader model and original part number. The replacement listed by Dayun is supplied as a complete assembly and is pressure-tested before shipment, which can help simplify installation and reduce unnecessary troubleshooting after replacement.
For distributors, repair shops and equipment owners, matching the hydraulic fan motor to the correct machine model is an important step in restoring the cooling system and reducing equipment downtime.
