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Low pressure trying to build up then cuts down as if you were pulling trigger on and off

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  • 83 Answers

SOURCE: honda pressure washer cuts out when lance trigger released.

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

  • 33 Answers

SOURCE: Kracher k3 97, low pressure

your pressure relief valve is stuck open. try adjusting the nut shaped stem on the front of the valve to see if you can unstick it. if not you'll have to take apart and clean.

Posted on Apr 21, 2009

  • 15 Answers

SOURCE: builds up to much pressure in hose and stalls engine

Sounds like the unloader is not working. try replacing it and see if that helps.

Posted on Apr 23, 2009

  • 92 Answers

SOURCE: Pressure washer lacks pressure initially?

Dear allbusiness9,
This problem is most probably due to a faulty Spill Valve( also called Control Valve). When the gun is released the spill valve is compressed and it either closes a micro switch or just opens from the bottom and keeps the water circulating. All spill valves keep the water circulating from the bottom part. Now when the gun is pulled (opened)...the spill valve extends and closes the bottom part, and thus water goes out of the nozzel. When you work with no nozzel, there is enough water flow to close the bottom part of the spill valve. So when the nozzel is placed back there is no chance that the bottom part leaks water. When the gun is started with the nozzel....the bottom part of a FAULTY spill valve,..will colapse and pressure drops. So to fix the fault you must change the Spill Valve. In some occasions, I also found that suction valves give this problem. A faulty sucktion valve will colapse under high pressure, and lets water pass the other way round.
But in my opinion and experience, your problem is in the Spill Valve.
Regards,
Fulltech.

Posted on Apr 23, 2009

  • 32 Answers

SOURCE: Pressure pulsating when pulling trigger

you have a restriction in the nozzle end of the lance. clean with paper clip.
if not you have some dirt in the pump head valves which need cleaning

Posted on Jul 04, 2009

  • 56 Answers

SOURCE: Karcher K4.97M electric waterblaster cycling

It sounds to me like the unloader valve is bypassing internally.

Posted on Nov 18, 2009

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1 Answer

I switch the pressure washer on motor starts pressure builds up motor stops. OK pull the trigger on the lance the moter starts sounds different water pressure low. Release trigger motor still runs.


It isnt very clear your explanation of the problem but what type washer do you have first? It sounds like you have a bad unloader or need a new variable nozzle tip. Can you explain in more clear detail. Thanks

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Starter cord want pull on husqvarna model 020524 pressure washer, not even with pressure of water off


hold the trigger down on the spray gun and then try, the pressure is built up in the pump - the pump can't turn against the back pressure.

Dec 27, 2014 | Husqvarna 3300 PSI 3.2 GPM Gas Pressure...

1 Answer

B&E pressure washer w/ comet 3540 pump


Things to check:
1) is water coming out of the bottom of the pump or is the oil in the crankcase high level and milky yellow. If so your seals are bad.

2) Your check valves might not be seating properly. A couple of fouled check vavles will cause either no pressure or pulsing pressure. A good inlet water strainer keeps foreign matter out of valves. But valves do wear out and get build up that keeps them from working right.

3) Your unloader valve might be worn or fouled. Bad unloader would usually show as low pressure ( but more than hose pressure) or low volume out the trigger nozzle.

Valves are your most likely problem.

Feb 17, 2014 | Comet Pressure Washer Hw3540s Triplex Pump...

2 Answers

Let go of wand trigger pressure will not come back


spill valve is stuck and needs to be cleaned and greased common problem....also check all connections for blockage in line

Jul 21, 2010 | Karcher 2500 PSI Pressure Washer

2 Answers

I have a Kew Hobby 80. The output from the lance is not constant but pulsates.


Could be the input water pressure is not sufficient. There is a pressure valve inside the machine that will cut off the motor if input pressure is too low or non existent.

Try a different source for the water input.

Feb 22, 2010 | Karcher PSI Electric Pressure Washer

1 Answer

Karcher K4.97M electric waterblaster cycling


It sounds to me like the unloader valve is bypassing internally.

Nov 16, 2009 | Karcher K2.26 Electric Power Washer

1 Answer

Runs but water pressure low, does not build pressure and stop as it usually does.


Hi If you check your pump head you will find a unloader valve that may need replaceing. It is situated on the pump head and moves in and out when pulling the trigger.

Oct 31, 2009 | Pressure Washers

1 Answer

Cycles, never builds up full pressure when trigger pulled


If you are sure it is not a bad o-ring and you have re-assembled it correctly then try this.
Visit here:
http://www.rjbowers.com/parts_manuals/partslist_1190343804.pdf
Part # 8 in the pump, karcher # 9.001-187.0 includes a small bullet shaped valve. It could be leaking. It can be carefully disassembled and cleaned.

Jun 13, 2009 | Karcher K2.26 Electric Power Washer

1 Answer

Kracher k3 97, low pressure


your pressure relief valve is stuck open. try adjusting the nut shaped stem on the front of the valve to see if you can unstick it. if not you'll have to take apart and clean.

Jul 13, 2008 | Karcher 2500 PSI Pressure Washer

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