Question about Alfred Karcher K 5.93 M Electric Pressure Washer

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When I switch my karcher k4.97 washer on it just sits and pulsates(on off on off etc.)When I squeeze the trigger it runs perfect,but emits a very low pressure.Then when I release the trigger it reverts back to pulsating. I have tried the popular fixes like cleaning lances,filters,making sure its not airlocked etc.I have even fitted new parts(seals to the pump etc).There are no leaks what so ever.

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You have an internal crack in the out let head of the machine very comon in thease machine and not expencive to fix

Posted on Jun 18, 2009

  • keefmarten
    keefmarten Jul 04, 2012

    What are the signs to look for with this problem?

    keith

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Posted on Jan 02, 2017

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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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Pulsating when idle


The motor doesn't pulsate when you are spraying and pulsattes when not spraying is normal otherwise the pressure will just keep building and burn out the pump. However, if you are not using the sprayer right away then the unit should be shut off until your ready to start again.
I hope the answer is helpful, please rate if the answer has helped in any way. Good Luck and have a great weekend.

Apr 03, 2010 | Karcher K 3.98 M Electric Pressure Washer

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I have a karcher 495, it is puslating when it is


It sounds like there may be a pressure leak somewhere in the system. The machine cuts off when there is no flow of water past it. If it is leaking then there is intermittent flow. Which would make the machine run then stop continuously.

Nov 15, 2009 | Karcher K 5.85 M Electric Pressure Washer

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I have a K3 78M electric unit . The motor pulsates


This sounds like an internal leak. If you are handy enough here is a schematic. On B@ it could be #25 is sticking or the valve inside #8 is leaking or the water seals #18 need replacing or #1 is leaking

Aug 18, 2009 | Karcher Garden

1 Answer

When I switch my karcher k4.97 washer on it just sits and pulsates(on off on off etc.)When I squeeze the trigger it runs perfect,Then when I release the trigger it reverts back to pulsating.It leaks water...


Well, first the easy bit... the pulsation is caused by the leak, because the machine can't hold pressure when the trigger is released.  The difficult bit is: what to do about it?  Unfortunately, there are several different places where the leak can occur and, even with the cover off, it's usually impossible to be sure exactly where the water's coming from.  In the repair shop where I work, we almost always replace every part that might be causing trouble without even trying to identify the exact source.  To do otherwise will rack the labour costs up so high as to render the job uneconomic.  We reckon that if you can't complete the job in 45 minutes it's not worth it.  Sad really, but such are the realities of our economics.
Anyway, unless you are a really competent handy-person, this is probably a job you won't want to tackle for yourself.  So your choice is either to live with it (and do whatever you can to limit the pulsating time - keep it working or switch it off immediately) or take it to a repair shop.  If you are in the UK, Karcher head office can direct you to a repairer, and I guess the same applies in many other countries too.
If you do want to have a go at it yourself, post another message here and I'll give you as much guidance as I can (but there will be a limit to the amount of detail I can provide, as I can't get in to writing a complete service manual!).

Jun 23, 2009 | Karcher Garden

2 Answers

The motor is pulsing on and off without the trigger being pressed


It is probably sucking air on one of the connections or around one of the fittings at the regulator. You can also turn the pressure up allittle on the regulator, that might stop it also. Make sure the clamps on the hoses going to the regulator is tite. Also it could be that the regulator is just bypassing water and if it has air in it it will pulsate.

Mar 14, 2009 | Karcher K2.26 Electric Power Washer

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