pressure washer runs for about 10 seconds then stalls, the pull string was rock hard afterward?

Brett

Trying to start this pressure washer (water hose was hooked up and everything), got it to start and it ran for about 10 seconds before it just stopped, sounded like the line was pushing water and getting stuck somewhere cause when I went to restart it the pull start was hard as a rock and when I finally pulled it something blew and water was coming out the bottom around the outlet tube, I had everything hooked up right I just wanna know if there is something else that would cause this
oh actually no water at all was coming out the end of the wand even if I pressed the trigger down

Answer
This is typically caused by a build up of pressure in the pump. Depending
on the pump on the washer, that build can be caused by a bad unloader or
even a stuck check valve. Please do not run the unit without the water
running, doing this can cause the internal parts of the pump to overheat
and possible become damaged. I would recommend contacting the manufacturer
of the pressure washer for a parts break down on the pump. Typically the
unloader and the check valves are simple to replace.

Why wouldn't a pressure washer be putting out any pressure?

Arch Bisho

I've had this pressure washer for 2 years, I just sold it and the guy says 'the pump cut out and won't come back on'. Its a 13hp Honda engine, on a 3600 psi 4gpm pump. What would cause a loss of pressure? If the pump seized, would the engine still run?
Its hooked up to a house spiket, I think it flows 6-8 gpm.

Answer
You didnt give much information as to what brand pump is mounted to the honda engine. But to venture an educated guess I would say Cam is right. The unloader valve is stuck in the unload mode. It could also be the "Easy-Start Spring" has broken and is locked in the start mode. (low pressure mode for easy starting of large horse power engines)

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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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