Pulsing pressure on pressure/power washer

Old 09-13-19, 02:17 PM
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Pulsing pressure on pressure/power washer

Any suggestions?
Video of the problem

Starts and runs well. Hose is new. The tips work on my other washer.

Thanks in advance.
Old 09-13-19, 04:00 PM
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My guess would be not enough water flow, open the faucet more and make sure there are no kinks in the garden hose. Have a good one. Geo
Old 09-13-19, 04:17 PM
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Thinking mainly where your water hose from the house threads on, but would check the output side as well, for a screen that may need to be removed and cleaned.
Old 09-13-19, 09:02 PM
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That rapid pulsation looks like bad check valves in the pump. There are 6 plastic check valves in the pump that can be seen if you remove the brass manifold. They are plastic and pull out of their bores. Often times an o-ring will come apart or some foreign material will get in and get stuck in them and keep them from working or the spring in them will get out of place or broken. Sometimes it's just some hard water deposit or corrosion causing the problem. Often they can just be removed, cleaned, and reassembled. I have one at the shop doing the same thing right now, waiting for my attention. Poor water supply usually causes a much much slower oscillation in my experience.

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