Question about Karcher 2500 PSI Pressure Washer

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Karcher k7.80 pressure washr

It seems to be leaking from the outlet hose and has lost pressure and keeps turning on and off HELP

Posted by SIMON BUTT on

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  • eiggam Dec 17, 2007

    I have a small karcher water blaster and it seems to be leaking on the inside, which I cant get to because it needs some special kind of screwdriver/allen key type tool. to undo the cage. Any ideas please.

  • Anonymous Feb 09, 2008

    i have a karcher k2.87 i have taken the back off (with the screw drivers readily available at bunnings) once we got the back off the whole unit is sealed for safety. So i guess i am left with no alternative to seek out a licenesed repairer.?????

  • Anonymous Jul 16, 2008

    I have a Karcher K3.86 M electric PW with a water leak problem that also causes the pressure to surge on and off. It appears that the plastic pump housing might be cracked but the crack is so thin it's hard to know for certain. I read on another site that these plastic pumps will crack if water is left in them and it's allowed to freeze in the winter. I think that might be what happened to mine but I cannot be certain.

  • Anonymous Mar 21, 2014

    the high pressure hose keeps popping off when you start it up



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I have a Karcher K 3.86 M electric PW with a similar problem: water leaks from the pump near the outlet and the pressure surges on and off continuously at intervals of 1-2 seconds. The leak appears to be coming from a very thin crack in the plastic pump head in what I think is the "unloader" valve portion. I read elsewhere that if you leave water in these PW's and it freezes it will crack, causing leaks. I don't know how you can empty all the water out so I think we must store these PW's in areas that won't freeze in winter.

Posted on Jul 16, 2008



Throw it in the bin and get a proper make. By the sounds of it karcher is a crap make

Posted on Dec 28, 2007


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Coleman 2400 PSI Pressure Washer - WATER LEAKS OUT = ?!? Help me please!!! ((-:

Usually, there are spaces between the pump and head portion of the pump. This space is not sealed and will allow water leaking past the seals to come out. There may be a seal kit available, however I have had better luck just changing out the whole pump. There are many available on ebay. Search for one that will use same mount and hoses. Once the seals are gone, the pump will never be the same (may nickle and dime you the death).

Oct 30, 2011 | Garden

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My Powercraft 9686 pressure washer has always been stored in my garden shed. It is 4 years old and when I used it last September the power washer had lost considerable pressure, as it was leaking water....

put some silicon spray in inlet/outlet then reattach hoses then run it will proform after a while do this everytime you store it pryer to sroring away...........

Jan 17, 2011 | Craftsman 2700 PSI Briggs Stratton...

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Turn water on then actuate wand trigger. Pressure washer leaks when wand trigger is actuated and has very low pressure/flow output. After releasing trigger the pressure cycles on - off at approx 1 second...

You gave a very close solution yourself for the problem. But other leakages can cause such symtoms.Forexample a leaking head or a leaking chemical inlet. These can be caused because the spill valve (pressure control valve) is stuck. When this valve stucks it will leave a micro switch ON. So the machine keeps working with the gun closed. This will in turn creat internal pressure and damages the head, valves and chemical non-return and even damage outlet hose. So besides fixing the leakages you must check and service the spill valve. I often replace the spill valve. One must also checks if the micro switch is faulty. Now very important that what you mentioned that the machine cycles at one minute intervals, with trigger closed...this is most probably always the spill valve fault. If you open machine you see a place where there is a wire..this belongs to the micro switch...under you find the spill valve. Intake and suction valves may now also have a fault. Also there are systems with non-return valves at the machine outlet. You have to tackle by elimination. Fix the leakage..then tackle spill valve and micro switch.

Jul 03, 2010 | Karcher PSI Electric Pressure Washer

2 Answers

I have a 21gal.125psi compressor,that will not pump up over 60-65

On most compressors of decent size (yours fits this category), the shutoff and startup pressure points are adjustable. This is usually done using a pair of screws under a pretty accessible cover. The on/off switch usually goes through this cover and the smallest of the air lines will go here, too.

Run the compressor with this cover off and watch which set of contacts opens when it shuts itself off. The screw that adjusts how resistant these contacts are to opening is the one that determines at what pressure the unit will shut off.

Turn the screw 1/4 turn clockwise, bleed down the compressor enough for it to start back up, and note its pressure when it shuts off. This will help you determine that clockwise is the right direction, and roughly how much more to turn it to hit your target pressure.

One other thing to keep in mind. Many compressors have an adjustable outlet with a gauge. If you've got two gauges, it's likely one is for the outlet and the other for the tank. If you've got two gauges, make sure you're reading the right one. If you've got an outlet gauge you also have some kind of easy to use control for adjusting it without taking any covers off.

If this doesn't help, some clarification would help, specifically the make and model of compressor.

On the teflon tape, I see it applied the wrong direction frequently. Not saying this is the cause of your problem, but seems a handy place to mention it.

When looking at the business end of whatever male fitting is getting the tape (business end being the part that meets the fitting first), wind the tape CLOCKWISE. This way, when you install the fitting, the friction from the threads is trying to tighten rather than unravel your tape.

Jun 01, 2010 | Chicago Pneumatic 1/4" Air Screwdriver

1 Answer

I have a Karcher pressure washer that leaks from the pump when operating.

could be little plastic pressure hose outlet,they can be porous and let pin holes of water through,pull plastic casing apart and remove high pressure hose outlet (black 'L' shaped pipe gun pressure hose outlet,ive repaired a couple,and machine works fine after

Oct 18, 2009 | Garden

1 Answer

My machine pch2401 has lost some pressure it just has recently been serviced I serviced it due to thinking it was that reason please help

thepressure adjustment should be the unloader valve between thepump and the outlet hose try screwing it in 1/2 turn also the nozzle may be starting to wear you could try anew nozzle

Oct 09, 2009 | Garden

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