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My Karcher 720MX pressure washer has lost some of its pressure at max setting. The pump sounds normal so is it more likely to be a problem with the gun/lance?

Posted by Anonymous on

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 14 Answers

SOURCE: I have a Karcher 3.99 Pressure Washer. The motor

You have a blockage in the nozzle. Try cleaning the jet out with a piece of wire and compressed air. You should be able to see through the nozzle when held up to the light.

Posted on Mar 11, 2009

  • 92 Answers

SOURCE: Karcher pressure washer won't start

Dear ralph_birtwi,
Most pressure washers when their gun is released, the machine stops automaticaly. This is done ny means of a control valve. When the gun is closed...pressure is built and the control valve moves and switches a micro switch off. In your case the micro switch is still closed in off position. Now this happens if a machine is left and stored with pressure in it., This control valve could get jammed and leaving the micro switch in off position. It could also stay in off position by sticking, due to incorrect chemical.
So the control valve or even called spill valve, must be renewed.
Sometimes a little lubrication with the right type of silicon grease will get the control valve working again. This job is sometimes delicate and better done by a qualified technician.
Regards,
fulltech.

Posted on Apr 12, 2009

  • 32 Answers

SOURCE: Karcher Motor Pulese On and Off

hi mark, you do have a problem with the lance.
you need to disconnect the lance and straighten a paper clip and insert down the nozzle end.
use the machine to wash the dirt in the nozzle backward down the lance.
Dirt only in nozzle end.
if still no good, purchase some nozzle cleaners and file out nozzle very slightly.

Posted on Jul 04, 2009

  • 5 Answers

SOURCE: karcher pressure washer trigger problem

The wands that it will not run with would most likley have a little dirt in the tip of the nozzle. This would not allow the water to flow through in turn activating the pressure switch and shutting the machine down

Troy

Posted on Jul 08, 2009

  • 5603 Answers

SOURCE: Hello there.My Karcher pressure washer motor

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.

Posted on Oct 03, 2009

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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.

Feb 17, 2014 | Karcher Garden

1 Answer

Devilbis Excell pressure washer with Honda engine runs smoothly without wand, but stalls when wand is attached.


If the pressure unloader is not working correctly and/or the nozzle is partially clogged with debris, the engine will be overtasked. Try lowering the pressure by turning the pressure knob to lowest setting and test. If the engine continues to run, gradually increase the pressure. Try using the washer set to about 75% of rated capacity and use max pressure for stubborn stains. Using any machine at max will shorten the life of components. If lowering pressure does not help, then unloader is faulty or stuck. Try storing the unit with oil in the pump. Remove both hoses and infuse oil into water inlet intill all the water is displaced (let set for day or two). Good luck

Sep 27, 2011 | Karcher 2500 PSI Pressure Washer

1 Answer

My three year old Karcher power washer has suddenly started behaving as if it has lost its power. There is also an intermittent motor noise when I release the trigger. When I press the trigger again the...


This sounds like it had water left in it and it froze over the winter. The motot turning on and off signals a water leak on the output side of the pump. You may have a cracked pump housing. Locate the pump and make sure nothing is leaking in that area when under pressure. looh for fine hairline cracks.

Apr 01, 2011 | Karcher Garden

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

My Karcher pulses when on standby,stops when i use the trigger,but it also seems to have lost pressure.Is less than 6 months old but have lost receipt!


Is there a leak from the bottom ?
If so Problem, the leak is from the seam of the Manifold housing. There is a small crack in the seam. A design weakness.. A New Manifold Complete Replacement approx. $61.03.
If not you may replace the Pump Manifold Housing from Karcher, or locate a local Karcher Service Center.
If under 1 year old, and you can find a receipt,Karcher will replace the entire Pressure Washer under warranty.

May 03, 2010 | Karcher K 5.85 M Electric Pressure Washer

1 Answer

Karcher G 3000 BH Engine Pumping Problem


This may not be a motor problem. It sounds like your pump is not working properly and the motor is just following the pump. First thing to do is check for leaks in the pump, wand hose, gun etc. It may also be a blown water seal inside the pump.

Aug 17, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

My karcher pressure washer has lost its water power


I have the same problem. With mine I have to remove the tip that I am using then pull the trigger and then replace the tip and pull and pressure should return. I believe that one of my valves is sticking causing me to reprime the pump frequently. I am trying to clean or replace my valves to fix the problem.

I hope this helps.

Apr 25, 2009 | Karcher Garden

1 Answer

Karcher 520M wont operate at high pressure


The solution is very simple. All you have to do is change the spill valve.
This because the spill valve is not worth servicing. The actual problem is that the spill valve is leaking from its bottom-part seating. When you close the gun, the spill valve goes down, opens from the underside, and switches the electricity off. When you press the gun, the spill valve returns to normal, and if the underside does not close, you have low presure, because the water keeps circulating.
Regards,
MG. (Karcher service engineer).

May 05, 2008 | Karcher 2500 PSI Pressure Washer

2 Answers

Karcher k7.80 pressure washr


I have a Karcher K 3.86 M electric PW with a similar problem: water leaks from the pump near the outlet and the pressure surges on and off continuously at intervals of 1-2 seconds. The leak appears to be coming from a very thin crack in the plastic pump head in what I think is the "unloader" valve portion. I read elsewhere that if you leave water in these PW's and it freezes it will crack, causing leaks. I don't know how you can empty all the water out so I think we must store these PW's in areas that won't freeze in winter.

Jul 29, 2007 | Karcher 2500 PSI Pressure Washer

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