Question about Karcher 2500 PSI Pressure Washer

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Karcher 2500 psi PW cuts out

Karcher 2500 psi pressure washer starts up just fine, but engine cuts out as soon as I pull on trigger to spray. This is a new problem. Unit has been workimg fine to date.

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6ya6ya
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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: karcher pressure washer

I had same problem won't build pressure. go to http://www.wmpcs.com/index.php?main_page=page&id=14 and see diagram. I pulled white plastic cover off top of pump (2 torx screws), remove main pump from gas motor otherwise you wont be able to get at the valve below. The important part is the valve below the the white plastic piece, it has a raised slot and mine was stuck in there. I used needle nose pinched together with pliers to lift it straight up. After wd40 and cleaning the hole and valve it should pop in and out easy. Put everything back mine worked like a charm after that. So at least I know what the problem is. Great powerwasher-I use for house painting part time and love it.

Posted on Jun 20, 2008

  • 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

  • 12 Answers

SOURCE: Pressure is fine when first started ,if trigger released no Psi

Your uplift injector valve in the water pump is sticking. You need to remove this part. Lube the top o-ring only with a water proof grease. Reinstall this part. You will be up and running again.

You need to use needle nose vise grip tool to easily remove the valve. You need to grind down the vise grip tool to fit the opening where the valve is installed.

To prevent this problem from reoccuring use a pump guard additive.

Posted on Apr 06, 2009

  • 92 Answers

SOURCE: Electric Karcher pressure washer surging when turned on

Dear firenutt681,
One simple thing you can do, is to check for leaks. Check if hose at machine is leaking. Check gun if it is leaking. You can also check if water still comes out of lance nozzel. These leaks however so small, will cause the machine to surge.
Another reason is due to a faulty SPILL VALVE. This spill valve( often called CONTROL VALVE) will contract when the gun is closed. When it contracts under the enclosed pressure it will switch off the machine by means of a Micro Switch. Now if this Spill valve is faulty it will loose its compression under pressure and puts on the micro switch again. This can be seen once in a while or more frequent, as in your case. I sometimes do service Spill Valves, but mostly I replace them with a new one. I do not know the model number of your machine, but normally you have to open the cover and you should spot the spill valve on the head. Most probably you see a thick wire or a cap containing the micro swith. If you find the micro switch, you have found the spill valve. Sometimes it is a bit hard to pull out the spill valve. Myself, in various Karcher models I remove the spill valve by trying to feed water and put on a bit the machine. In this way the spill valve will be spitted out.
Another reason which makes your machine surge, is leakage from from the detergent inlet.
If you do not see no leakages at all....then for sure it is the SPILL VALVE.
If you cannot do this job yourself or you do not find spare parts...you can continue using the machine as it is...but before closing the gun...switch off the electricity. I only recommend this in an emergency. You do this so that you do not leave the machine surging. This surge will for sure damage the electric motor and the capacitor (assuming it is single phase).
Regards,
Fulltech.

Posted on May 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

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1 Answer

Pressure washer start fine and idles appropriately trigger is depressed washer runs for about five minutes then just shuts off. Engine restarts fine but when trigger is depressed engine shuts off


looks like the fuel cap may not be venting try it with the cap loose allowing air into the tank sounds like lack of fuel entering into the carburetor.

Aug 03, 2013 | Karcher 2500 PSI Pressure Washer

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I have a Honda XR2600 pressure washer. When the wand trigger is pulled, the throttle does not open, the RMD just drops. If i manually open the throttle, it works fine.


Your engine produces max horsepower at 3600 rpm. The engine throttle should be set to max before you pull trigger. Pressure washes generally do not have automatic throttle. You do not have to use max power, but enough power to keep the engine running when trigger is pulled. You washer will actually last longer if you only use about 75% of rated capacity. Good luck

Oct 15, 2011 | Karcher 2500 PSI Pressure Washer

1 Answer

Engine runs great, when i turn the hose on it dies.if i hold the trigger and start engine it runs, as soon as i release trigger the engine dies


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.

Sep 18, 2010 | Karcher 2500 PSI Pressure Washer

1 Answer

We have a Karcher G2500VH pressure washer. If you start the engine with the trigger pulled on the spray wand it will run at full pressure until you release the trigger. after that, when you pull the...


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 ,

Mar 07, 2010 | Karcher 2500 PSI Pressure Washer

1 Answer

Power washer will not start


Clean the carb. Change the plug. Get some start fluid but use sparingly. Run the water (pull the washer trigger) while you are trying to start the engine.

Sep 07, 2009 | Karcher 2500 PSI Pressure Washer

2 Answers

Gas pressure washer will not start


I have a 5hp honda power washer sat for 2 years it will only run if I spray gas in the carb as soon as I stop spraying the engine stops I have took off carb and cleaned it

May 31, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

Pressure is fine when first started ,if trigger released no Psi


Your uplift injector valve in the water pump is sticking. You need to remove this part. Lube the top o-ring only with a water proof grease. Reinstall this part. You will be up and running again.

You need to use needle nose vise grip tool to easily remove the valve. You need to grind down the vise grip tool to fit the opening where the valve is installed.

To prevent this problem from reoccuring use a pump guard additive.

Apr 05, 2009 | Karcher 2500 PSI Pressure Washer

2 Answers

Gas pressure washer


I have the same problem with a Karcher 2400hh.
Go to: http://www.wmpcs.com/index.php?main_page=page&id=14
they have the best diagrams and answerss that I have found.

May 02, 2008 | Karcher 2500 PSI Pressure Washer

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