Question about Toolbank Karcher Hd511cl Hd5/11C 110V Commercial Pressure Washer

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Karcher 5/11c motor runs but no pressure - Toolbank Karcher Hd511cl Hd5/11C 110V Commercial Pressure Washer

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oysterman

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Firstly make sure the pressure set valve is turned the right way, fully anticlockwise I think.(if it has one I could be thinking of the next model up) and that the lance nozzle is in the correct position not set to detergent or mid point between positions. If that is ok it is probably the switch at the bottom of the machine. If under warranty send it back karcher switches are not good.

Posted on Mar 13, 2014

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My karcher k7.85 has lost pressure and the motor runs constantly when switched on ,motor only used to run when trigger pulled in on lance ,there is no leaks. Can any one help please.


Sounds like the pump seals are bad. The manual says to only use these a few minutes at a time, most people try to clean the patio etc with them, run them too long, and burn out the pump seals - don't ask me how I know this.

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1 Answer

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it is not uncommon that the switch is bad? if the switch controls the pressure telling it their is water and to start working? then i would just replace the switch.

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1 Answer

I have a Karcher K3.540 pressure washer. Won't take up detergent and motor pulses ever second if vari-lance increased towards maximim. Motor runs ok at lower pressure but can take 1min to start wh


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1 Answer

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1 Answer

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A common problem with these is a pressure valve inside the unit that controls the power to the pump. If the unit has not been used for some time the valve can stick.

Does the motor run when you press the trigger?

Please respond and I will advise further. (add a comment)

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1 Answer

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The valve that admits more water to be compressed is stuck. It is likely the O-Rings on it need replacing. No water to the pump, no pressure!

The motor will stop when pressure is up to the designed pressure.

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1 Answer

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bob I had this happen to my Karcher, the pressure seals have blown. $Au200 for service and replacement from karcher dealer. tyhey would not sell the parts for a DFY

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1 Answer

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Turn off the water supply, connect the high pressure hose, turn water back on, start the motor and away you go.

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1 Answer

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1 Answer

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