21221878 Volvo FM FMX D11K Water Pump

What does a water pump do?

This water pump plays a critical role in the engine cooling system by circulating coolant between the engine block and the radiator. By maintaining constant fluid movement, it prevents engine overheating and ensures thermal stability during heavy-duty operations in construction or transport environments.

Vehicle and engine compatibility

This component is specifically designed to fit Volvo FM models, including the FM 480, 440, 380, 340, 300, 400, 360, 390, and 430 variants. It is also compatible with Volvo FMX trucks equipped with the D11K engine. These parts are essential for maintaining the service life of heavy commercial vehicle engines.

Maintenance and installation

Technicians should inspect the pump during routine cooling system maintenance or when replacing timing belts. It is important to check for signs of failure such as coolant leakage from the weep hole or unusual bearing noise. Ensure all mounting surfaces are clean before installation to maintain a proper seal.

Troubleshooting guidance

Selecting a high-strength component ensures reliable performance under high-pressure thermal cycles. Consult your authorized distributor for precise fitment verification.

OE cross-reference

525.03.0006 (Water Pump Water Pumps) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 21221878.