Question about Karcher 2500 PSI Pressure Washer

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No pressure when squcing trigger

Engine runs great but no reaction when squeezing trigger. Could use information on how to obtain parts and operation Manuals

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6 Suggested Answers

  • 174 Answers

SOURCE: 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.

Posted on Jun 18, 2009

  • 174 Answers

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

  • 5603 Answers

SOURCE: sometimes when I squeeze the trigger I will have high pressure

The bypass valve is sticking.

Posted on Sep 23, 2009

  • 4 Answers

SOURCE: Power washer loses pressure. Engine runs fine.

Your bypass valve is jamming. All you do is take it out, put a smear of o ring grease around the o rings then put back in, make sure you push it all the way in and should fix the problem.

Posted on Sep 30, 2009

  • 251 Answers

SOURCE: We have a Karcher G2500VH pressure washer. If you

Hi, Karcher calls the unloader valve a spill valve,
this is a link to a full drawing/parts listing , and your fault description might well be a sticking /seized unloader(spill ) valve hope this helps
http://www.pressureparts.com/ManualViewPage.aspx?Manual=/mmDEV/PDF/karcherparts/g2500vh.pdf

the part number is on page 9 of the drawing
spill valve 45910400
hope this helps , we usually use some good quality silicone grease to lube the valve ,

Posted on Mar 08, 2010

caroldon
  • 17129 Answers

SOURCE: engine runs great, when i

Make sure thre is no air lock in the system line. So first of all use a clean line to wash off and blow out any dirt in the spray gun.
make sure the engine is having good fuel and power it on to run and warm up . let it run over without any load on it . Now turn the hose on it and power it on slowing, do not stop but keep it running to power spray . The accumulated dirt might come off and make the run smooth after some time.

Posted on Sep 18, 2010

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1 Answer

My Karcher 530M runs ok until I release the trigger, then it will not start again unless I switch and allow the water to run through for about 15 secs before switching on again


Hi Cliff:
My experience is that the pump pressures prevent the engine from starting, so we hold the trigger while starting.
My brother has cut a wedge of wood that he uses to jam the trigger open to bypass the problem. It can get a bit wild if the wand is not secured when the unit is started..

Aug 10, 2016 | Karcher Pressure Washers

1 Answer

Why does it build pressure, but when I squeeze the trigger the engine stays at idle?


POSSIBLE this look picture hose coupling with water stop put on the tap side or lime in valves after long time or a nozzle with dirt close beaten
clogged nozzle on the lance

Bypass not working (lyme)
if you disconnect the lance and the handle grip is giving enough water and water comes out then the nozzle clean it with a little paperclip.25944841-me02dbjx1ofpduv3i0g3gg4u-5-0.jpg

Nov 06, 2015 | Pressure Washers

1 Answer

How do i stop it from pulsing?


Getting to much air to carb probably.

Jul 11, 2015 | Karcher Pressure Washers

1 Answer

Why does my pressure surge


Common problem across brands. When you spray water the drop in pressure triggers the motor to take the hose pressure ~ 30 psi and boost it to ~ 3000 psi. Water coats these parts with calcium (hard water) or other junk and water contains bacteria which causes slime and scale. Once that pressure switch / valve is sufficiently clogged it doesn't move smoothly so it can fluctuate between sending a yes / no signal about whether you are squeezing the trigger or not. This causes the pulsing.

EZ test: take the the tip off the wand, start the unit, squeeze trigger - should run continously with no problem. If it does for sure you need to watch a video on dissembling and cleaning the valve body. It is not hard but you must work carefully to avoid losing parts especially springs and take digital pictures to record the order for reassembly.

Jun 04, 2014 | Dewalt DPD3100 Gas Pressure Washer

1 Answer

I have a craftsman 675 pressure washer. It runs fine. But when I turn on the water, it dies. What is wrong with it?


either the engine is worn and has no power or the pump is overloading the engine........

squeeze the trigger before you turn on the water.....
try no high pressure hose to make sure the water exits the pump ok

Sep 01, 2013 | Craftsman Pressure Washers

1 Answer

Low pressure from powerwasher wand when trigger is squeezed


THIS POWER WASHERS ARE TRICKY, TO OPERATED YOU NEED TO OPEN THE WATER FAUCET CONECTED BY A HOSE TO THE POWER WASHER , OPEN THE TRIGGER AND THEN START THE POWER WASHER, OTHER WISE YOU WILL RUIN THE POWER WASHER PUMP.

Nov 01, 2010 | Briggs & Stratton Pressure Washers

1 Answer

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.

Aug 24, 2009 | Karcher 2500 PSI Pressure Washer

3 Answers

I HAVE A BRAND NEW TROY-BUILT 2600PSI pressure washer. I have used it twice for about 1/2 hour each time. It worked perfectly. I tried to use it today with everything hooked up perfectly. The Honda engine...


Sounds like the governor is stuck. My pressure washer speeds up when it has to pump. Don't know if yours uses vacuum to trigger governor or direct linkage. Good Luck.

Jul 04, 2009 | Psi Blue Max 2200 High Pressure Gas Power...

1 Answer

I squeeze the trigger, I have pressure for 2-3 seconds and the engine dies.


your pump is probably cavatating. when you first hook it up and turn hose on open thr trigger and let water run thru until it quits spitting and flows smooth. then crank it up and see if this gets it done. if not you could have a problem with the pressure valve bolted on the outside of pump. there should be a nut shaped stem to adjust pressure . turn it in and see what happens.

Jul 20, 2008 | Karcher 2500 PSI Pressure Washer

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