Similarly, the piston or plunger seals wear down over time, allowing water to leak back into the reservoir instead of being expelled forcefully through the nozzle. When to Seek Professional Repair While replacing a valve or seal is manageable for DIY enthusiasts, some issues indicate severe internal damage.
Identifying and Fixing a Damaged Bypass Valve in Your Pressure Washer Pump
This involves turning the machine on with the spray gun unlocked and the unit submerged in a bucket of water, or using the thumb to block the water inlet until pressure builds. If you hear loud knocking or grinding noises, or if metal particles are visible in the oil, the bearings or crankshaft may be failing.
Sending the unit to a professional for a rebuild kit ensures the internal components are matched correctly and the pump operates at peak efficiency for years to come. A warped or damaged valve will allow water to bypass the sealing surface.
Identifying a Damaged Bypass Valve in Your Pressure Washer Pump
Inspect the inlet filter for clogs and confirm that the unloader valve is functioning correctly, as a faulty unloader can prevent the pump from priming properly. If this valve is stuck open, water will bypass the pump head entirely, resulting in zero pressure at the nozzle.
More About Troubleshoot pressure washer pump
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