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Karcher 720mx stopped pressure. Motor shuts down. Unit hums

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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hemantraj
  • 638 Answers

SOURCE: Karcher K4

It sounds as if you might have an air lock/air bubble in your pump circuit. If you've not already done so, try holding the trigger on your high pressure nozzle for several minutes with the engine OFF. (just your water pressure forcing water through the unit) Repeat this a couple of times, if necessary. If an air bubble is the problem, this should clear it. The only other thought I have is one of your household water pressure...is it adequate? Low water pressure at your faucet could also be a factor. Consult your manual. It should specify the minimum pressure for your washer to function properly, probably stated in gallons/minute.
if this solution helps you any way rate it as "fixya". feel free for further assistance. thanks for using fixya

Posted on Jun 10, 2008

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  • 174 Answers

SOURCE: motor starts and stops

Diagram here
It could be the Overpressure valve is leaking #20
It could be one of the small valves is not sealing #14 and #15
The soap valve could be not sealing #7
I have also seen micro cracks in the cylinder head #8
Good Luck

Posted on Jul 20, 2009

  • 15 Answers

SOURCE: karcher k 3.99 does not pause correct

Is there a water leak from the bottom ?
Is so, then there maybe a small crack in the seam of the plastic manifold pump housing or one of the connecting fittings. A New Manifold Complete about $61.00. You may purchase direct from Karcher, and replace if you are mechanically inclined.
If under 1 year old, and you can find a receipt, Karcher will replace the whole Pressure washer under warranty.

Posted on Jul 14, 2010

  • 15 Answers

SOURCE: karcher k 3.99 does not pause correct

Is there a water leaking from the bottom ? If so then there maybe is a small crack in the Pump Plastic Manifold Housing. A New Manifold Complete Replacement is approx. $61.03 from Karcher, if you are mechanically inclined.
If under 1 year old, and you can find a receipt,Karcher will replace the whole Pressure washer under warranty.

Posted on Jul 14, 2010

  • 13 Answers

SOURCE: My Karcher 720mx moter is working fine but i have

hi put some silicon spray in inlet and outlet then reconnect hoses what is going on is when you store it the seals start to dry out.........

Posted on Jan 19, 2011

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1 Answer

What is this problem - Karcher 3.86 electric pressure washer: humming noise, plug gets very hot, then unit shuts down?


Your pressure washer is either not fitted with a run/stop device in which case like mine you have to switch off within a few seconds of closing the trigger. Check your model features?
The humming noise is the motor stalled out against the pump because there is nowhere for the water to go. The shutoff is caused by the safety overload switching off after overheat.
Or, it has a pressure operated run/stop which is not working. Because water and electricity don't mix, I would suggest getting more specific help. You can download Karcher manuals /spares lists online from Karcher specialists but remember electricity is the silent killer.

May 20, 2014 | Karcher Garden

1 Answer

I have a Karcher 3.49M purchased 8/2/09. Using the washer I inadvertently turned on after changing hoses, but forgot to turn water back on; this activation lasted only a couple of minutes before I realized...


Normally when you dry run a machine you damage the pump so it would probably need changing. The motor might be Ok but for you to fix it you will need to take it to a Karcher dealer/service center.

From experiance it sometimes can be more cost efficient to purchase a new Karcher machine and get the 12 month warranty than spending money on an older machine.

Jan 19, 2011 | Karcher PSI Electric Pressure Washer

1 Answer

My Karcher 720mx moter is working fine but i have no water pressure coming from pump


hi put some silicon spray in inlet and outlet then reconnect hoses what is going on is when you store it the seals start to dry out.........

Jan 13, 2011 | Karcher K3.68MR Electric Pressure Washer

2 Answers

Karcher 294 no pressure motor hums


http://www.fixya.com/support/t2162702-karcher_electric_press_wash_hums_when

Mar 08, 2010 | Karcher Garden

2 Answers

Honda GC190 engine shuts down on my Karcher 3000 PSI PW


Well would you believe that I have the very same problem. I suspected that the pump was seizing up, so we tried the pump on another unit and it worked fine. On inspection of the motor we found the cam (which also operates the decompression mechanism) was worn out. It's made of hard plastic. It is only about 7 dollars too, so cheap enough to fix. I have mine ordered now and feel pretty confident that that should fix it.

Aug 13, 2009 | Karcher 2500 PSI Pressure Washer

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I started working with the Karcher KB4040 pressure washer and all was well for 1-2mins, then it sputered a bit and all power died. All hoses were still attached properly, it hadn't blown a fuse in my house...


if the water is in anyway impeded, like kink in hose the unit turns off and goes into protection mode. That it it shuts down for a pewriod of time depending on how hot it may have got.
When its rested try it again ensuring you definitely have water flow.If the solenoid has failed it costs about !60-200 to fix as they replace all seals regardless

Jul 22, 2009 | Karcher 1750 psi Electric Pressure Washer

1 Answer

Motor starts and stops


Diagram here
It could be the Overpressure valve is leaking #20
It could be one of the small valves is not sealing #14 and #15
The soap valve could be not sealing #7
I have also seen micro cracks in the cylinder head #8
Good Luck

Jul 19, 2009 | Karcher K2.26 Electric Power Washer

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