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Errratic flow,bursts of water

Model No: APW-120A
Problem: Incosistent, non-continuous flow of water. When I hold the trigger down I have gotten a stream of water lasting a minute or so before the motor cuts out. More frequently the burst of water lasts oly a second to maybe ten seconds. Am I wrong in thinking that the flow/burst of water should last until I release the trigger? If so, how can the interruptions be eliminated?

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  • aghumber Oct 07, 2009

    This is an electric pressure washer.

  • aghumber Oct 08, 2009

    When I say "the motor cuts out" I mean that even thogh the trigger is held down, no water comes through the nozzle. The power source is still good, but the pressure is not there.

  • JERRY ABELL
    JERRY ABELL May 11, 2010

    hello is this machine gas or electeic??

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Hi! robcarroll
Did you purge the air from the pump before starting the motor.
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You most likely need to set your valve clearances. If it is hard to pull over or the recoil snaps back after starting your valves need to be set for sure. This may not be the entire problem but it is a good start. Also change the spark plug, a bad plug will cause odd problems and is too cheap not to eliminate as a source. In addition check your fuel, pour a little out into a white container (I like spray paint can caps for this) and look at the color. If it is yellow to orange it is bad. You can pour it into you car, the car electronic sensors will compinsate for it quality but a small engine can't. Use a NGK BP6ES or BPR6ES plug.
You need:
Feeler gages
10mm open end wrench
14mm open end wrench
1 long shaft screw driver or rod
1 spark plug socket and ratchet

Remove the spark plug and the valve cover. Pull the recoil over slowly until the intake valve opens (intake is closes to the carb and it will go down when it opens). Now put your long screwdrive down the spark plug hole. Slow pull the engine over until the screwdriver handle is at it highest point, this is top dead center. It may take a few attempts. Now check your valve clearance between the rockers and the top of the valve. The intake should be .006 and the exhaust .008, both can be +/- .001. To adjust: hold the large nut with the 14mm then loosen the small one with the 10mm. Lefty loosey. Now turn your large nut until you get the correct setting and then tighten the small one the lock it in. It may take a few attempts and alway reverify your setting after you lock it down. Once done, find top dead center again and reverify. Now your valves are set.

Posted on Mar 31, 2009

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either your fill valve needs replaced or your flush valve needs replaced

Posted on May 28, 2009

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SOURCE: Lack of pressure after releasing the trigger on the wand

Hello awcockerill:
This sounds like the bypass (unloader) valve is sticking. Here is a diagram of your machine's pump. On page 2.4 see part #1. The top of this assembly is a black plastic cover. Remove all of assembly # 1 carefully. Under that is part #8. This is the bypass valve. You need to pull this out, check that the o-rings are not bent, worn or damaged, then lube it good with a VERY VERY good waterproof grease. Re-assemble it and all should be well. The part numbers are on the diagram but where to get them depends on were you live. Karcher web site may give you a number to call. Good luck.

Posted on Aug 25, 2009

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