Question about Karcher K2.26 Electric Power Washer

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Motor runs fine but pressure output has dropped by 50% Karcher K3.97 about 3 years old

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6ya6ya
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Posted on Jan 02, 2017

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jmgldsmth
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SOURCE: new Karcher pressure washer won't start

replace the fuel carburetor filter and, or, your fuel tank filter

Posted on Aug 31, 2009

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wiringlunati
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SOURCE: karcher k3.86 motor runs but has no pressure when

Could be a pump, but most likely the unloader valve is stuck open. After replacing/repairing the valve, do the following to prevent it in the future: after finishing using it, unhook both hoses and pull the start cord on the engine several times to empty the water from the pump and valves. This is especially necessary when using hard water.

Posted on Nov 20, 2009

  • 299 Answers

SOURCE: Karcher K2.36 motor cut out and won't restart

Yes, the water should be turned on first but if it only ran for a minute or two it should be OK. Most late model pressure washers have an automatic shutoff when the trigger on the wand is released. Turn on the water and then the machine and then squeeze the trigger on the handle of the wand and the motor should start as soon as the air is cleared from the line by the flowing water (about 10 seconds). If the unit was put away wet last season you may need to clean the nozzle with a piece of wire too.

Posted on Apr 16, 2010

Testimonial: "Thanks brobin, your advice was spot on and it is now working again, much appreciated"

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1 Answer

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I have seen it before where the little plastic pistons overheat and melt. The unit still runs but with no pressure. I would pull the pump apart and check the pistons.

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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.

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The water must be switched on, and seen to be running freely from the nozzle for a few seconds before switching on the power - suggest you check the fuse in the plug, and then try the above.

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Karcher K2.36 motor cut out and won't restart


Yes, the water should be turned on first but if it only ran for a minute or two it should be OK. Most late model pressure washers have an automatic shutoff when the trigger on the wand is released. Turn on the water and then the machine and then squeeze the trigger on the handle of the wand and the motor should start as soon as the air is cleared from the line by the flowing water (about 10 seconds). If the unit was put away wet last season you may need to clean the nozzle with a piece of wire too.

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