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.
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.
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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