asked

I am working on a Karcher K3.96M electric pressure washer. The complaint is low pressure and the machine surges when the trigger is not engaged. Where is the unloading valve in this machine? Is it the dark gray and maroon check valve in the inlet elbow (part number 90012660 in the spare parts list) and would this cause the surging? Additionally, what does the 'reset looking' button on the electrical box do and what position should it be in? I took off the cap to investigate and it looked as though it had been tripped. I turned the 'reset knob' 90 degrees counterclockwise raising the metal lever which in turn lowered the bill that contacts the pin from the valve body for the soap dispenser. Now the machine doesn't pump at all. How can I solve this issue?

November 3rd, 2023

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