Question about Alfred Karcher K2400HH 5 Hp 2.5 Gpm @ 2400 Psi Gas Pressure Washer

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Occasionly I will get pressure for as long as I hold the trigger

But if I let off the trigger I will not get any pressure the next time I pull the trigger. I have taken the pump apart and cleaned it and checked all the valves except the upper most (looks like a relief valve) which I don't know how to take apart. I have cleaned the intake filter which had quite a bit of calcium deposit. What could be causing this problem.

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  • greisen10 Jan 11, 2009

    The recommended fix was right on the money. Thanks. Gerry


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Look for a black plastic cover with a silver snap on top; pry off the silver snap and lift off the plastic cover; next remove the two screws on the top plate then pull out the piston inside - if unable to lift out, start unit and watch it pop out - coat piston with lithium grease and reinstall.

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