Windscreen washer pumps on HGVs: a brief guide to diagnosis and replacement
Washer pump failure on an HGV is straightforward to diagnose. If the wiper blades activate normally but no fluid is delivered to the jets, the fault is either in the pump motor, the fluid supply, or the delivery line. Check the reservoir is not empty and the delivery hose is not kinked or blocked before replacing the pump.
HGVs run 24V electrical systems, and the washer pump must match the vehicle supply voltage. Fitting a 12V pump to a 24V system will destroy it immediately. A failed windscreen washer system is a DVSA annual test failure.
Frequently Asked Questions
How do I test a windscreen washer pump on an HGV?
Remove the pump connector and apply 24V directly across the pump terminals. If the pump runs, the fault is in the supply circuit, the fuse, or the switch. If the pump does not run with direct supply voltage, the pump motor has failed and the unit needs replacing.
Can I use a 12V washer pump on a 24V HGV?
No. A 12V pump run on 24V will fail immediately. Always confirm the vehicle supply voltage before ordering a replacement. The pump specification in the parts catalogue will state the rated voltage.
Is a failed windscreen washer system a DVSA annual test failure?
Yes. DVSA inspectors check windscreen washer operation as part of the annual test. A pump that does not activate or does not deliver fluid to the screen is a failure point. This is an easy test to fail and easy to prevent.
Does Truckstop Group stock washer pumps for all HGV makes?
We stock windscreen washer pumps for the main HGV makes. Call us with your chassis number to confirm the correct pump for your vehicle.
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