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My water blaster "surges" on and off every second when the trigger is released, its a karcher 1740psi, not too sur of model code.

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Replace the unloader valve

Posted on Nov 19, 2009

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Posted on Jan 02, 2017

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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

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

2 Answers

My electric Karcher pressure washer does not shut off.


this can be that you need to bleed the system of air or that there is a problem with your trigger gun sticking when you release the trigger.
These are two things I would check before you go into the machine.

May 14, 2012 | Karcher Garden

1 Answer

New rotary nozzle will not work. will spin and then stop and repeats.


By rotary nozzle do you mean the dirt blaster? or a different accessory? if it is the dirt blaster it could be that there is air in the system. take the dirt blaster lance off, then pull the trigger with high pressure untill you get a complete flow of water. then put the dirt blaster onit should work.

Another thing that could have happened is if you have bought the wrong dirt blaster for your machine as there are different types for different models.

May 15, 2011 | Karcher 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

1 Answer

Vacuum lock when releasing trigger. water will


It sounds like the valve in your trigger gun is sticking. Depending
on the model it can be rebuilt or repaired

Sep 08, 2009 | Karcher Garden

1 Answer

Pressure surge on and off for 2 seconds w/ new Karcher


It can be one of three conditions,
  1. The water supply in is not sufficient
  2. The pump oil is low
  3. The seals are bad in the pump.
I would check the first one first as this is the most common problem.
The water supply hose should be a high volume hose of at least 1/2 inch but 5/8 inch or greater is best.

May 08, 2009 | Honda Karcher G2400HH-R Pressure Washer

1 Answer

Karcher 2400 psi blaster When you release the trigger it will not pick up pressure when you use it again


To determine if your problem is due to an easily replaceable part, follow these steps:

1. Connect the water supply hose, the pressure hose, and the wand WITHOUT any nozzle tip.

2. Turn on the water supply, and press the trigger until water is smoothly running out of the nozzle
after any air is all purged out. Release the nozzle trigger.

3. Start the engine, and let it warm up for about 30 seconds.

4. With the engine running smoothly, press the nozzle trigger. The water should flow out of the nozzle (without the tip installed) at a faster rate, while the engine noticeably loads down as it used to do before your "no pressure" problem. If it does not load down, turn it OFF, and disconnect everything, and contact a Karcher repair facility.

5. If the engine does load down, release the trigger, and install one of the nozzle tips (not the black one).

6. Press the trigger, and the engine should load down, and you should have normal pressure from the wand. After you release the trigger and press it again, you will probably again have no pressure, and the engine will not load down. Removing the nozzle tip, pressing & releasing the trigger, and re-installing the tip should give you normal pressure again, but releasing the trigger will cause no pressure until you again remove the tip, press the trigger, and re-install the tip.

This is caused by a bad UNLOADER VALVE, which is located under a black cap with a metal button on it located on the top front of the pump. I don't know if you can purchase the replaceable parts from a Karcher repair shop, but when a neighbor & I took his washer to a repair place, it looked pretty simple to do this repair, and he was charged about $60 to replace a $5 (maybe) part, and it took about 5 minutes.

Sep 12, 2008 | Karcher 2500 PSI Pressure Washer

1 Answer

There is no pressure


To determine if your problem is due to an easily replaceable part, follow these steps:

1. Connect the water supply hose, the pressure hose, and the wand WITHOUT any nozzle tip.

2. Turn on the water supply, and press the trigger until water is smoothly running out of the nozzle
after any air is all purged out. Release the nozzle trigger.

3. Start the engine, and let it warm up for about 30 seconds.

4. With the engine running smoothly, press the nozzle trigger. The water should flow out of the nozzle (without the tip installed) at a faster rate, while the engine noticeably loads down as it used to do before your "no pressure" problem. If it does not load down, turn it OFF, and disconnect everything, and contact a Karcher repair facility.

5. If the engine does load down, release the trigger, and install one of the nozzle tips (not the black one).

6. Press the trigger, and the engine should load down, and you should have normal pressure from the wand. After you release the trigger and press it again, you will probably again have no pressure, and the engine will not load down. Removing the nozzle tip, pressing & releasing the trigger, and re-installing the tip should give you normal pressure again, but releasing the trigger will cause no pressure until you again remove the tip, press the trigger, and re-install the tip.

This is caused by a bad UNLOADER VALVE, which is located under a black cap with a metal button on it located on the top front of the pump. I don't know if you can purchase the replaceable parts from a Karcher repair shop, but when a neighbor & I took his washer to a repair place, it looked pretty simple to do this repair, and he was charged about $60 to replace about a $5 (maybe) part, and it took about 5 minutes.



Sep 11, 2008 | Karcher 2500 PSI Pressure Washer

2 Answers

Pressure problem


i think the problem is the pressure release valve.see www.pressureparts.com for the above model.this the web for karcher washer.

Jul 09, 2008 | Karcher 2500 PSI Pressure Washer

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