21221878 Volvo FMX D13K 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 and the radiator. Built with high-strength components, it is designed to withstand the intense thermal and mechanical stresses found in heavy commercial vehicle applications.

Compatible Volvo vehicles and engines

This component is compatible with Volvo FM models including the FM 480, 440, 380, 340, 300, 400, 360, 390, and 430. It is also specifically fitted to Volvo FMX 480, 440, and 400 trucks equipped with the D13K engine. The part serves as an equivalent to original equipment standards for these specific heavy-duty engine configurations.

Maintenance and installation guidance

To ensure proper function, technicians should inspect the pump during belt service intervals. Signs of wear include coolant leakage from the weep hole or unusual bearing noise. Replacing the pump alongside relevant belts can prevent overheating and protect the engine from cavitation or thermal damage.

Troubleshooting and replacement

Regular inspection of the cooling system interplay—including the thermostat and radiator—is recommended to ensure maximum longevity for this high-flow component.

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.