Question about Karcher 2500 PSI Pressure Washer

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Pressure Washer Pump Failure

I think that my pressure washer just had a pump failure. I have a few questions about this -
Why did it happen? How can I fix the pump? Does this happen a lot?


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  • jimc0928 Aug 31, 2008

    I have the same problem with my 3500 psi gas powered washer. I can't fine answers nor a place for repairs


5 Suggested Answers

  • 1 Answer

SOURCE: pressure washer wont run unless choke is on

I have a Karcher pressure washer w/ a 5hp Honda engine. It only will run while the choke is pulled out and only runs at about half the rpm's. When the choke is pushed in.. it coughs, sputters and shuts off. Can you tell me how to fix this....

Posted on Nov 05, 2008

  • 33 Answers

SOURCE: pump on my pressure washer will not pressuerize

there is a loader and unloader valve on your pump bolted to it. if it frozen in the open position it will never build press. most of the time this is caused by leaving cleaning solutions in system after use and let set up for a long period. it causes the aluminum case to corrode.;you will have to dissassemble and clean if not to bad. if not your going to have to replace.

Posted on Apr 21, 2009

  • 1 Answer

SOURCE: Karcher pressure washer 411A. loss of pressure...

411a when i turn on it gos for 1 min then i have too press it on and off 3or 4 times befor it works and it only stays on for 1 min.

Posted on May 21, 2009

  • 92 Answers

SOURCE: Can't fine where to put pump oil in

Dear glenoaks06,
I handled various Karcher washers, but the 2500 I never came across it. Just the same I will give you a few hints and maybe the solution for the problem. When the oil is milkey this means it has water in it. This means that there are faulty seals for sure. Now in many Power Washers the compartment where the oil is located is filled with oil prior to assembling the head unit that contains the pistons. So you have to take apart the the complete head change all seals( HP seals, LP seals and OIL seals). There are pumps that take multi-grade oil(15/50) and others 90 grade oil. If your pump is fan cooled, it probably takes 15/50 oil. Now one of the main biggest problem of water in oil is Faulty and Scratched PISTONS.
So when you have the pump apart....check condition of pistons. It is useless to change seals if pistons are damaged.
Now one thing regarding your problem, is that you have to put together the head with the pump upside down, so that you can fill the compartment (where the pistons are pushed by the swash plate), with OIL, before you put back the complete head with good pistons,springs,seals, valves...etc..etc. These few hints are relevant to quite a number of Karcher washers.

Posted on May 22, 2009

  • 40 Answers

SOURCE: where is the unloader valve on my pressure washer

is not necessarily a cap, but could be a screw in plug, that should be close to the hose hook-up on the pump Inside there there should be a round ball and a spring that you can tighten or loosen to adjust the unloader and if it has been used ALOT, where the ball seats there could be grooves cut in there and you might need to get a valve kit to fix it

Posted on Sep 05, 2009

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2 Answers

I have a craftsman pressure washer model 580.752191 no pressure building. checked unloader valve and greased the internal parts, and it does flex (had to do it with channel locks) no pressure

do you get pressure without the hose attached ???
yes ???
bad wand
no ???
stop wasting your time as the pump is most likely bad. Ebay a new one
oh, greasing internal parts can cause them to hang up. 3and1 oil is a better choice, and pump saver should be used when pump is being stored

Apr 14, 2015 | Craftsman Garden


WARNING: Do not allow PW to run "dry"

It is recommended that once pressure washer is in operation and water flow thru wand is there ,that you do not allow off period between burst of no more that 2 minutes or you highly risk damage to your pump,not engine, due to overheating. See if Dump valve is adjustable,cheaper models not adjustable. This valve senses pressure/heat build up in pump when trigger is released, and is a secondery backup to release such heat/pressure to avoid pump failure. If you have repeatly left trigger off for more than 2 minutes in for prolonged periods of time,this is not good.

Thanks and Please Rate a Fix Ya
John jj505

on Apr 15, 2009 | Honda 8 HP Engine

2 Answers

Why is there no water flow through on pressure washer?

Sounds like a pump failure. Does yours freeze in winter? Need to winterize like cabin plumbing.
Repair/replacement of pump could be close to new unit.

Aug 19, 2014 | Powerboss 2600 PSI Gas - Cold Water...

2 Answers

Why does the motor run when I do not pull the trigger of the gun after the high pressure washer is turned on? The motor is supposed to run only if the trigger of the gun is pulled and shuts off when the...

When water is running through system, the motor has to run to keep the pressure built up. So, if the water is leaking out, the motor think it needs to keep running to keep the pressure built up. The leak needs to be fixed to the motor will not run constantly.

Jun 16, 2014 | Karcher PSI Electric Pressure Washer

1 Answer

Water sprays out from underneath. The water is spraying forward and to the right. Is this a common gasket failure issue? Or do I really need to take it all apart? (sigh) I have so much else I have to do...

i'm sorry to say but if you happen to have a vertical motor you'll be better off buying a new pump for 150.00 online.if you see the casing is made of pot metal which corrodes from the impurities of water mainly chlorine.stay away from pressure washers that have a shaft downward like a lawn mower they much like consumer use only for residential 1 to 3 times a year.find one with a horizontal shaft where you can have a much better chance of getting it fix or get replaceable parts for.feel free to question me i've been in this business for 30 years.
ps a replacement pump with a solid brass head would be better the main killer to these pumps is that they leave the unit running with trigger closed which causes pump tp rapidly heat up and cause failure you must squeeze trigger within 3 to 4 minutes tops so that the heated water in pump head has been released.

Aug 04, 2013 | Briggs & Stratton 2200 PSI Gas Pressure...

1 Answer

My problem with Karcher K2-59M is doesn't switch off when releasing spray trigger and it leaks water from two small holes in water inlet tube. I have stripped the washer down but find no solution. Also...

these units normally use a flow switch which actually feeds the pump motor failure to shut down causes overpressurization in pump head causing pump failure oil is normally sealed replacing the oil, pump has to be separated from motor and possible seal replacement unless u have a way to inject the oil through the lip of seal with out damaging it.

Aug 03, 2013 | Garden

1 Answer

I have a Husky 3000 PSI - Was working fine (I think ( for about hours. All of a sudden it seemed to get a burst of energy and worked faster. Shut it off to add gas. When I started it up again, there...

Pressure washer are pretty simple, a few pistons and a spring device to control the pressure. The problem could be a broken part inside the pump itself. With any luck it could be the linkage between the pump and the motor. If there is a oil window in the pump or a pump oil fill plug open this and with the engine switched off slowly pull the starter cord and see if the pump works are moving. (don't do it fast or let the engine start or there will be oil everywhere.) this will tell you if the pump is working. It could also be the diverter this wold be harder to diagnose you could go and replace the whole pump also.

Aug 09, 2011 | Honda Pressure Washer PSI 3000

1 Answer

Had presure tostart cleaning @ then press. stopped just seem to have water press. thank you

if the motor is still running fine when this happened it is either a failure in the linkage between the gas motor and the pump. or the pump itself. if it looks like the motor does nothing whatsoever. it may be the link between the two. if the motor does a little bit, then the problem may be with the pump. Try turning off the engine while spraying and see if the pressure drops at all

Aug 08, 2011 | Honda Karcher G2400HH-R Pressure Washer

2 Answers

I have a 3000 PSI Honda pressure washer. The motor

May have sediment buildup in the pump housing, ???

Jun 04, 2009 | Honda Pressure Washer PSI 3000

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