Question about Karcher 2500 PSI Pressure Washer

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When pressure washer handle is activated I get a burst of water then the pressure goes away

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The pump key was gone and the shaft was torn up so had to get new pump.

Posted on Sep 01, 2014

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The machine has a worn by pass valve. Change valve assembly. Also check high pressure valves are not worn or blocked,

Posted on Mar 06, 2009

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1 Answer

Will not build up pressure sounds like it is but as soon as you hit the trigger pressure goes away


Is this something new happening?

These machines quickly (a matter of seconds) build up to pressure and shut off. A slow leak is not much of a player. Eventually the pressure will bleed off and the pump come on (for a few seconds).

Pressure restored, should be good to go. Have you cleaned the inline filter to the hose. If there is a short burst of water then a dribble with a new hose, the filter is a first check

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Why does my pressure hose burst when I use a turbo nozzle


Turbo heads are pressure rated for different pressure washers, your turbo head is most likely rated bellow the maximum pressure of your washer which in turn causes a pressure build up in the hose and it's eventual failure.

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1 Answer

How do I get chemicals to pull through my power washer?


this is a downstream injector which will only activate under low pressure normally a black nozzle with a large hole.A good way of testing is disconnect gun and wand assembly leaving the hose on the ground turn water on let it free flow no need to start engine.You should hear or feel suction out of hose barb if not try starting motor this time but this time you need to grab the hose so that it would not swing and hurt someone with engine running causing more flow should activate it.

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1 Answer

Craftsman 580 767101 when i squeeze the handle pressure it loses pressure. If i squeeze i get a burst of pressure, it then fades out. Relese the handle and squezze i get another burst


Sounds like the inlet water source may be blocked. When you hold the trigger open, water should flow freely. If this is not the problem, it may be that the pump seals are going bad.

Jan 21, 2014 | Craftsman Pressure Washers

1 Answer

I have a Bosch aquatak 120i the motor keeps running all the time


Hello sir, that is a on going problem with power washers the pump not working, than works sporadically. the main cause is leaving the pressure hose hooked up to the machine over a long period of time,not draining hose & machine, in the winter time the hose & pump will freeze causing hose & pump to expand and burst.handle to leak busting the o rings, build up of calcium deposits from hard water clogging up pump nozzle,valves in the gun handle,clogging hose fittings and screens.one of these has to be your problem.you can find a parts brake down at KARCHER.COM.orRJ BOWERS.COM . and manuals,these are good info,sites,hope this helps.thankyou. ~~

Feb 19, 2012 | Pressure Washers

1 Answer

Leaking handgun karcher k785


Hello sir, that is a on going problem with power washers the pump not working, than works sporadically. the main cause is leaving the pressure hose hooked up to the machine over a long period of time,not draining hose & machine, in the winter time the hose & pump will freeze causing hose & pump to expand and burst.handle to leak busting the o rings, build up of calcium deposits from hard water clogging up pump nozzle,valves in the gun handle,clogging hose fittings and screens.one of these has to be your problem.you can find a parts brake down at KARCHER.COM.orRJ BOWERS.COM . and manuals,these are good info,sites,hope this helps.thankyou. !!

Feb 19, 2012 | Pressure Washers

1 Answer

Honda 5HP pressure washer. When you press handle to get pressured water, motor does not rev up to give you high pressure.


Most small pressure washers do not have an automatic throttle control to increase engine speed on demand (activated by trigger on wand). You must set the governor/throttle to about max. to get the rated pressure. A honda motor produces 5 hp when it is turning about 3600 rpm. To increase the life of the pump, use about 80 % of capacity of the pump and increase only for stubborn debris.

Jun 17, 2011 | Honda Pressure Washers

1 Answer

Why does the pressure washer water come out in bursts?


Is your inlet water supply open fully, it will pump in spurts if the pump is not receiving enough inlet water volume and pressure.

Mar 27, 2011 | Pressure Washers

1 Answer

Have honda karcher 5.0 pressure washer and i cant get it to spray any water or pressure out the gun at all? Why??


Hi,

That is a on going problem with power washers the pump not working, than works sporadically. the main cause is leaving the pressure hose hooked up to the machine over a long period of ,not draining hose & machine, in the winter time the hose & pump willfreeze causing hose & pump to expand and burst. build up of calcium deposits from hard water clogging up pump nozzle,valves in the gun handle,clogging hose fittings and screens.one of these has to be your problem.you can find a parts brake down at KARCHER.COM.orRJ BOWERS.COM . and manuals,these are good info,sites,hope this helps, MrFixIt,oh could you please rate this solutions

If it is not leaking water anywhere and the nozzle is OK then go HERE
Turn it off and shut the water of. Go to pate 2.1 of the manual
Carefully remove part #2. Pull out part # 1 and make sure the O-rings are in good shape ad are lubricated with a good waterproof grease. Re-assemble and try it.

Thanks for contacting Fixya

Jul 01, 2009 | Pressure Washers

1 Answer

Loses pressure


The unloader valve in the water pump is stuck. The grease wears away after time. You need to remove it, apply grease to the upper o-ring and reinstall it. Use pump guard in the future to prevent this problem.

Mar 21, 2009 | Karcher 2500 PSI Pressure Washer

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