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Karcher 4.640 no pressure and motor running constantly. Checked inket filter and no leaks.

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6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Karcher K3.91 compressor run for a few seconds every 10-15 second

They have a problem. I removed both valves and lubed with lithium grease as I was told. Unit is now working for how long who knowes.

Posted on May 19, 2009

  • 250 Answers

SOURCE: The motor keeps surging

If there's a lot of sediment in your water supply, there's a chance that sediment has gummed up the pressure switches. I'm assuming it has a full power switch and high power switch. It runs on full power until a pressure switch is satisfied, and runs on low power to slowly build the pressure back up, at which a second switch is satisfied from the pressure and turns the motor off. These things are not easy to work on, and are made of metal probably too fragile to try any chemicals. You should probably contact the manufacturer.

Posted on Sep 19, 2009

Testimonial: "Thankyou, great help!"

  • 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"

  • 34 Answers

SOURCE: My electric Karcher pressure washer does not shut off.

this can be that you need to bleed the system of air or that there is a problem with your trigger gun sticking when you release the trigger.
These are two things I would check before you go into the machine.

Posted on May 16, 2012

SOURCE: karcher pressure washer leaking oil

Usually electric pressure washers only have oil on the pump, so its very likely that you will find the problem there. I'd say check all the pump seals and if that doesnt solve the problem, you can check to see if all bolts are tight when you close the pump back.
If by any chance you are looking for a new machine and/or parts for your machine, log in to www.roncoshop.com where you will be able to find pretty much anything for your preassure washer.

Posted on Jun 26, 2012

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The motor keeps surging


If there's a lot of sediment in your water supply, there's a chance that sediment has gummed up the pressure switches. I'm assuming it has a full power switch and high power switch. It runs on full power until a pressure switch is satisfied, and runs on low power to slowly build the pressure back up, at which a second switch is satisfied from the pressure and turns the motor off. These things are not easy to work on, and are made of metal probably too fragile to try any chemicals. You should probably contact the manufacturer.

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