craftsman power washer model 580.741380 I have low pressure. How do I fix it.?

pressure washer unloader valve image

johnborgli

Engine runs fine. Very low pressure comes out of the hose. I think it's something to do with the pump. Can I adjust or remove something to get more pressure.

Answer
Check your water inlet to the pressure washer. If water is restricted it cannot build pressure

Make sure you have the right tip and it is working properly. A pressure washer is designed to put x amount of gallons through x size hole to produce pressure.

Try adjustment near number 26 which appears to be an unloader. Line drawing is very poor best guess.

The valve would be under a hex nut on the pump head and if debris is in them pressure will fail. They are a spring seated assembly. they come out after the cap is off with a pair of needle nose pliers

With a better line drawing I could offer more advice but again the drawing is very poor.

I would not recommend try to remove the pump from the motor as it appears to be a wobble plate which are spring loaded and difficult for an experienced repairman to reassemble

Gas Karcher pressure washer won't "Kick-In"?

Michael L

I have a Gas Briggs and Stratton/Karcher pressure washer. When I pull the trigger on the wand, the unit does not "kick-in". Sometimes if I play with the trigger, on and off very fast, it will start to pressurize.

I have replaced the hose and trigger with slightly better results but not a remarkable change.

Any suggestions?

Thanks in advance,
Mike
I did some research on the unloader valve as suggested below and found the following solution:

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 piston out, start unit (with hose attached) and watch it pop out - coat piston with lithium grease (I used white grease) and reinstall.

Answer
check the unloader valve

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