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K 3.86 M, UNIT SURGES WHEN WAND TRIGGER IS RELEASED

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shaun dolman

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It sounds like you have a leak on your outlet system.Please check your high pressure hose at the machine and also the trigger and lance.Check all o rings etc and replace if needed.If there was any leaks at all then this will stop the machine from surging.

Posted on Jun 24, 2010

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Karcher electric power washer480 .pump runs on when trigger is released there are no leaks . Also i can not turn machine off at the main switch.


If you are unable to shut off the pressure from the wand, there may be an issue with the unloader valve that is stopping it from switching into bypass mode when the trigger wand is released. The unloader valve is designed to respond to the spike in pressure created when the trigger wand is released, and to divert the flow of water coming from the pump to bypass the pressure hose and flow back into the intake end of the pump. If the unloader valve fails to switch into bypass mode, water may continue to flow out of the trigger wand. This may also cause damage to the wand. If you are unable to shut off the pressure from your power washer, stop the engine and discontinue use immediately. The unloader valve should be removed and possibly replaced if found to be malfunctioning. The inability to stop the flow of high-pressure water from the wand can be dangerous and should be fixed before continuing to use the machine.

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1 Answer

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Hope this helps.

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1 Answer

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