Question about Karcher 2500 PSI Pressure Washer

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Kracher k3 97, low pressure

The motor runs and cuts out as it sould befor the trigger is pulled, but when the trigger is pulled there is flow but no pressure the motor cuts in ok, i have checked the inlet filter, please help.

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Your pressure relief valve is stuck open. try adjusting the nut shaped stem on the front of the valve to see if you can unstick it. if not you'll have to take apart and clean.

Posted on Apr 21, 2009

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1 Answer

My Karcher 530M runs ok until I release the trigger, then it will not start again unless I switch and allow the water to run through for about 15 secs before switching on again


Hi Cliff:
My experience is that the pump pressures prevent the engine from starting, so we hold the trigger while starting.
My brother has cut a wedge of wood that he uses to jam the trigger open to bypass the problem. It can get a bit wild if the wand is not secured when the unit is started..

Aug 10, 2016 | Karcher Garden

1 Answer

I switch the pressure washer on motor starts pressure builds up motor stops. OK pull the trigger on the lance the moter starts sounds different water pressure low. Release trigger motor still runs.


It isnt very clear your explanation of the problem but what type washer do you have first? It sounds like you have a bad unloader or need a new variable nozzle tip. Can you explain in more clear detail. Thanks

Feb 16, 2015 | Garden

1 Answer

Pressure washer runs about 10 minutes then cuts off


Could be low oil. Most motor turn off as a protection when the motor oil is low. Also, recently I have a similar problem, with a easy solution, just don't push the accelerator nob all the way, leave a 1/4 before reach full power. Apparently some times there is a bad calibration an make the carburetor over flow.

Sep 16, 2014 | Craftsman 2700 PSI Briggs Stratton...

1 Answer

Pump will not unload.


Hi if it stop when the trigger is pulled the issue is with the motor.
stopping is caused by , low revs on motor or low compression or poor spark, sometimes faulty carby.
change spark plug , adjust valve ( when valve has some slight side movment it is ok if up and down , it should be tighter (valves usually under side cover near top ) increase revs a little ( make sure revs dont get rough when running high) set max revs to when the engine still runs smoothly at max.

Mar 30, 2014 | Delta Model DT2400CS Pressure Washer 5.5HP

1 Answer

I have a honda 2600 pressure washer. After running fine for a couple of seconds the water will stop flowing out the tip. It is receiving water,but will not flow it to the pressure hose. I even disconnected...


This happens when air gets inside the hose. An air bubble of sorts is in the hose and will not build pressure until you blow the air out of the line. Start the pressure washer, turn on the water. pull the trigger on the gun. It will spitter and spatter and come to a trickle. release the trigger on the wand. Pull the trigger again and it will eventually work it self out.

Jun 13, 2011 | Honda Black Max 2600 PSI Pressure Washer

1 Answer

When trigger is pulled pressure goes up and down as long as trigger is held


When you start the pressure washer, having the water from the faucet at full pressure, apply pressure to the triger gently....this should allow the system to release the pressure gradually and keep up.....when you pull the trigger full throttle, it can cause the jurking sensation in system. If this does not resolve the problem you may have a bad empeller pump and requires replacement. Do not allow the pressure washer to run for more than a couple of minutes without water flowing thru is as this will burn up the motor )empeller pump). Good luck

Feb 11, 2011 | Garden

1 Answer

Karcher K2.36 motor cut out and won't restart


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.

Apr 16, 2010 | Karcher Garden

2 Answers

I have a Kew Hobby 80. The output from the lance is not constant but pulsates.


Could be the input water pressure is not sufficient. There is a pressure valve inside the machine that will cut off the motor if input pressure is too low or non existent.

Try a different source for the water input.

Feb 22, 2010 | Karcher PSI Electric Pressure Washer

2 Answers

Pressure Washer Engine will not stay running


My Kracher 2500 pressure washer has no pressure unless I remove the nozzle. If, I remove the nozzle and pump the trigger several times and quickly replace the nozzle it works fine until I release the trigger. Karcher (online) suggested I remove and clean the unloader which I did. It still doesn't work correctly. What another solution?

May 29, 2009 | Garden

1 Answer

Mi TM 2700 pressure washer has no pressure.


With the water on, to the washer and the unit running. Does the water come out at the same rate before the trigger as at does after the trigger (run test with spray nozzle removed). Its not impossible for unloader valve to be bad but it usually is a dependable component. Make sure the unit has the air purged from it properly before start-up, make sure there are no obstructions before the trigger, then the nozzle. The unloader valve just puts the pump into by-pass until the trigger is depressed.

Apr 10, 2009 | Mi T M WP-2700-4MHB Pressure Washer

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