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.

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Why won~t my power washer stay running when I realease the spray nozzle? Thanks?

john w

Answer
The pressure bypass valve,often called the unloader valve,is stuck.It's purpose is to route the pressurized water back into the pump so that when the nozzle is shut,the engine will not stall from over working.Try locating it and fiddling around with it to free it up.

Karcher 2500 pressure washer pulsating?

Jamie

I have been working on a karcher 2500 pressure washer I got in a garage sale. I have taken down the pump and replaced some of the valves and the spill valve. The hose it came with was cracked, but I didn't get a new one until I thought I could get every thing working. Once the pump was put back on it ran fine with the cracked up, but the pressure was lower than I thought it should be. I figured it must be the hose causing my pressure problems, so I got a new one. Ever since I put the new hose on the pressure wash pulsates (It has full pressure for a second or two then it loses pressure for a second or two.) Any ideas what could be causing this?

Answer
This should be an easy fix. The unloader valve is sticking....quite a common problem for Karcher machines. On the top of the pump you will find a black plastic cover with a chrome button on top of it. Pry the button off and lift the black plastic cap off. You'll find two star or hex screw under it....remove these and carefully lift the plastic retainer up. You are now looking at the unloader valve assembly. You'll need needle nose pliers to to remove it. Look down into it and you will see a tab to clamp the pliers onto. Gently twist it pulling up slightly at the same time. Once you have it out, clean it and apply some silicone grease to it and replace it. Put everything back together the way you took it apart and your done.

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