21280077 Volvo FMX Water Pump Replacement

The water pump serves as a critical component within the engine cooling system, functioning as a centrifugal pump that continuously circulates coolant between the engine block, cylinder head, and radiator. This constant movement prevents overheating and ensures that thermal loads are managed effectively during heavy-duty operations.

This specific water pump is engineered for Volvo FMX series trucks, particularly those utilizing the D13C engine. It is also compatible with various Volvo FM models including the FM 400, FM 360, FM 340, FM 380, FM 440, FM 480, FM 300, FM 390, and FM 430. Ensuring correct fitment is vital for maintaining engine temperature stability in construction and transport applications.

For professional technicians and workshop owners, it is recommended to inspect the pump during routine belt or timing belt service intervals. Common signs of wear include coolant leakage from the weep hole or unusual bearing noise. Proper installation ensures the impeller and mechanical seals function correctly under high pressure.

Consult your authorized distributor to verify exact fitment for your specific vehicle chassis.

OE cross-reference

525.03.0020 (Water Pump Water Pumps) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 21280077.