Question about Karcher PSI Electric Pressure Washer

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Pressure pump keeps pulsating when trigger not pressed

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There is orobably a minor water leak on the output side of the pump. The pump is sensing a pressure drop due to the leak so it will run for short periods to maintain the pressure i the output line.

Posted on Aug 20, 2010

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Posted on Jan 02, 2017

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Landa pressure washer LT 4035-4000 psi. Why is it losing pressure and continually pulsating?


If the pump is pulsating rapidly most likely valves are leaking or debris under valve keeping one or more from closing. If the pump pulsates slowly, comes up to pressure then low pressure then repeats, problem is pressure regulator /bypass. Or you could have a combination of both. Try lowering the pressure to lowest setting to see if slow pulsation stops. As parts age within pump and debris hinder operation you can no longer operate at full pressure. To make the pump last, use highest pressure as needed and everyday work using only 60 to 75 percent of capacity.

Mar 19, 2013 | Garden

1 Answer

Good evning. the problem with my washer is. the pump pulsates when trigger is released. I have a good pressure supply to the unit . help please.


it sounds like the seals in the pump are worn out.if you can purchase a replacement seal & o'ring kit you can do it yourself.get the model number and buy the kit to suit.dis asssemble the pump and replace the o'rings & seals.assemble pump and test.

Jan 19, 2011 | Karcher Garden

2 Answers

POWER CRAFT BY Karcher bought Aldi on 31Mar 05.2100Watts 130 bar.


You did winterize the machine? Leaving water in a powerwasher will freeze and damage the pump. It's a common happening, because people don't think of it or are not told by the maker.

Apr 29, 2010 | Karcher K2.26 Electric Power Washer

2 Answers

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

1 Answer

Karcher 360M pressure washer pulsating problem when idleing


Hello,


unfortunately these little units have this problem commonly, 9 times out of 10 it will be the plastic head or the plastic valve block on the unit will be cracked and leaking slightly... it builds up pressure then leaks out and tries to build up the pressure again and this just reoccurs over and over...

you can get this repaired but is normally about half the cost of a new unit, if the pressure is still okay i would probably recommend just keep using it until it proper dies...

If you do get this fixed, we have studied into this and believe the main cause of heads cracking is warm water say if your inlet hose is in the sun for a period of time this can cause the water to become quite hot or if the unit sits and water trapped inside the head assy freezes can also cause this. Hope this helps Kind Regards Brad

Dec 16, 2009 | Karcher PSI Electric Pressure Washer

1 Answer

My 1750 psi campbell hausfeld pressure washer will operate at first until I release the trigger on the wand. Then it won't restart. If I wait for a while it will run again. Sounds like the pressure switch.


Common with that washer...it has a wabble pump. Release the trigger, if by pass does not engage, stalls engine. You can however keep using it, all you have to do is keep trigger pressed, and when you are cranking engine, depress trigger with the free hand. Can be repaired, but the fix probably will cost more than a new pump.

Oct 18, 2009 | Garden

1 Answer

Pressure pulsating when pulling trigger


you have a restriction in the nozzle end of the lance. clean with paper clip.
if not you have some dirt in the pump head valves which need cleaning

Mar 22, 2009 | 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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