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Karcher k7.85 pressure washer has suddenly lost pressure no water leaks what is the problem

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: karcher k7.80 pressure washr

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

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SOURCE: Unloader Valve - Karcher Pressure Washer

where is the unloader valve locaed on a Briggs Stratton pressure washer?

Posted on Oct 03, 2009

  • 2468 Answers

SOURCE: My Karcher pressure washer pulsates

your pressure bypass valve is leaking water pressure by and not building full pressure

Posted on Sep 12, 2010

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1 Answer

My Karcher KB 9030 has lost pressure and is hunting when no demand water supply is plenty


In most cases the water lines can have leaks that bring bring in air and so the pressure will be less. Power off the washer and let the water flow without any air bubbles. If you seen bubbles then recheck the joints.Check the same with the outlet.
If not there is fault on the main pressure pump.

May 02, 2011 | Karcher Garden

1 Answer

My three year old Karcher power washer has suddenly started behaving as if it has lost its power. There is also an intermittent motor noise when I release the trigger. When I press the trigger again the...


This sounds like it had water left in it and it froze over the winter. The motot turning on and off signals a water leak on the output side of the pump. You may have a cracked pump housing. Locate the pump and make sure nothing is leaking in that area when under pressure. looh for fine hairline cracks.

Apr 01, 2011 | Karcher Garden

1 Answer

My Karcher pressure washer pulsates and the water pressure is not as good as when I first got it


your pressure bypass valve is leaking water pressure by and not building full pressure

Sep 12, 2010 | Karcher Garden

1 Answer

Karcher K2.26M water leak


I have the same Problem, the leak is from the seam of the Manifold housing. There is a small crack in the seam. A manufacturing defect.. A New Manifold Complete Replacement K2.26* Part # 97501760 is $61.03, about the half the price what I paid for this pressure washer at Walmart... :( If under 1 year old, and you can find a receipt,Karcher will replace the whole Pressure washer under warranty.

Jul 03, 2010 | Karcher K2.26 Electric Power Washer

1 Answer

Water is leaking from under the chrome piece inside my Karcher 3.68m pressure washer. Hose intake and outlet look good. Any sugeestions.


Plastic Pump Manifold is cracked.
Can be replace at a local Karcher Service Center, or if you are mechanically handy. Replacement Manifold Complete, is available from www.karcher.com.
If it is under 1 year old, and under warranty Karcher will replace if you have a Receipt proof of purchase.

Jun 08, 2010 | Karcher K3.68MR Factory Refurbished 1,800...

2 Answers

My Karcher pulses when on standby,stops when i use the trigger,but it also seems to have lost pressure.Is less than 6 months old but have lost receipt!


Is there a leak from the bottom ?
If so Problem, the leak is from the seam of the Manifold housing. There is a small crack in the seam. A design weakness.. A New Manifold Complete Replacement approx. $61.03.
If not you may replace the Pump Manifold Housing from Karcher, or locate a local Karcher Service Center.
If under 1 year old, and you can find a receipt,Karcher will replace the entire Pressure Washer under warranty.

May 03, 2010 | Karcher K 5.85 M Electric Pressure Washer

2 Answers

Just started using my kb4040 and water i s leaking


Sounds like the water seals are bad. For Karcher parts go here: LINK

Jan 18, 2010 | Karcher 1750 psi Electric Pressure Washer

1 Answer

Karcher 3300 G water leak out rear of unit from white plasticplug


if its just a plug, remove it with an allen key and wrap a couple layers of teflon tape around it. That should stop, or at least slow down any leaks that are coming out of the threads.

Jun 19, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

My Karcher HD 1050 DE has lost pressure, ive had new valves put on it but still has no go in it


could be allsorts. seals worn. ceramic pistons split, inlet manifold split( frost damage), unloader valve sticking, etc etc.

Put mains water pressure onto it and look for leaks, then run machine and see if it increases pressure, if not i would suspect unloader valve sticking.....

Not very familiar with the 1050 but i'm a service engineer for high press cleaning equipment...

Oct 12, 2008 | Karcher 2500 PSI Pressure Washer

2 Answers

Karcher k7.80 pressure washr


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.

Jul 29, 2007 | Karcher 2500 PSI Pressure Washer

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