Question about Karcher PSI Electric Pressure Washer

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Pump motor runs continuously

The pump motor runs continuously all the time the device is powered on. When new it only ran when there was water flow, ie the trigger was pulled and the washer in use. Then it started to ''pulse'' when not in use, ie the motor ran for half a second every two seconds. It's a K 4.99 M - that wasn't listed so I had to choose the nearest item in the list

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

stug_57u
  • 99 Answers

SOURCE: No pressure in the pressure washer

Leaving the hose on shouldn't cause a problem so don't panic. It sounds like you could just have a dirty nozzle. Try sticking a pin or something in the end of the nozzle (machine not running) and giving it a clear out. also if it is a two peice gun, split it and tap the squirting part on something clean like a workbench to clear any debris that might have got in there.

Posted on Nov 01, 2008

  • 33 Answers

SOURCE: Kracher k3 97, low pressure

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

  • 56 Answers

SOURCE: Karcher K4.97M electric waterblaster cycling

It sounds to me like the unloader valve is bypassing internally.

Posted on Nov 18, 2009

  • 1 Answer

SOURCE: Karcher/Winner 11 - motor pulses when hose is not operating

Hi, I had the same problem, Replaced the O rings and the rubber seals and cups inside the pressure washer and eventually the hose itself burst. Turns out the hose was leaking, internally between the inner sheath and the outside plastic cover, for quite some time and this caused the pulse. New hose and pressure cleaner is as good as new.

Posted on Mar 12, 2010

  • 1383 Answers

SOURCE: pressure washer does not spray consistent flow of pressure

Pressure washers have a pressure regulator/unloader that bypasses the water back into the intake when you let go of the trigger with motor running. If you let the machine run for long preiods in bypass the system could be damaged due to heating of the water being bypassed. The water is in a closed loop. The as the unloader wears it will tend to want to bypass which is what is happening in your case. Dirt trapped at the tip will cause this also. Install clean tip to solve problem. If clean tip did not help then try lowering the pressure by turning pressure regulator counterclock wise. If problem is gone then parts are failing but keep using pump. Good luck.

Posted on Jul 11, 2010

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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..

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The machine is standing in the upright position with clean water in it. No power to the machine. If water is pouring out, again no power to machine, then the pump is cracked. I don't know the model number so I am thinking this has a gravity fed pump. It doesn't use electricity to work the pump. Once you pull the trigger water starts to flow. If the pump has a crack water will flow all the time. Hope this helps!

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Why does the motor run when I do not pull the trigger of the gun after the high pressure washer is turned on? The motor is supposed to run only if the trigger of the gun is pulled and shuts off when the...


When water is running through system, the motor has to run to keep the pressure built up. So, if the water is leaking out, the motor think it needs to keep running to keep the pressure built up. The leak needs to be fixed to the motor will not run constantly.

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when the trigger for the wand is not pulled , there is a pressure relief valve that bypasses the water in the pump and so there is no pressure until the trigger is pulled again.
with the pump getting hot and not being able to pull the motor to restart, it indicates that that pressure relief valve has jammed ( faulty ) and the pump is running at full pressure all the time
That will heat the pump and stop the engine from restarting
That valve is where I would start looking for a problem

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Sta Rite Pool Pump


Probably need new pump if the impeller broke.
If impeller broke, then motor will run, but no water circulates
Call pool company.
Motor resources:
http://waterheatertimer.org/Color-codewire.html#motor

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Have a Karcher kb4040 that continues to run constantly even when the trigger isnt pressed. Also water flows out of the detergant hose when im not pressing the trigger. Pressure seems down slighlty, not...


This is two things. One is the back flow check valve to the soap line is leaking. The other is the pressure switch on the output side of the pump.

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Been cleaning for 2 hours now with my Bissell Quicksteamer and on my next run i presses the water release trigger on the handle and water isnt being squirted on the carpet..why?


ran out of water? (if water) >
Is there some form of water filter?
Problem with the trigger?
Bad steam heating element or the power connection supplying the power to it?
Of could it just be tired and need a break? (grin)

Best Regards
Ck

Aug 16, 2011 | Vacuums

2 Answers

Water flows thru the pressure washer pump and out of wand, when I start the motor flow stops. I have a craftsman model # 580.752060 I've taken pump apart and there are no obstructions that I can...


Hi,

Let the water run for a longer time. "Walk" the hoses, from the faucet to the pump and then to the nozzle, holding the hoses up to displace any trapped air in the lines through the pump and out the nozzle. What it sounds like is that air is reaching the pump. When it does, it cavitates, and no water can be pumped. Tighten all of your hose fittings securely. Try holding the trigger down while starting the washer. It may be easier with another person helping.
Best regards, --W/D--

Jul 08, 2011 | Craftsman 2500 PSI Briggs Stratton...

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

I just bought a 2nd hand honda excell psi max vr 2522 2.2 gpm max 5.5 hp gvc160. i put gas and oil and it wouldn't start?


Have a helper hold the trigger of the wand open while you try it again. If it starts that way you have a sticky unloader valve in the pump. DO NOT RELEASE the trigger for more than 10 seconds if the engine continues to strain when released! If the engine doesnt run freely when you let go of the trigger, pull it again and shut down the unit!
Add some power steering fluid to your supply hose (about 3 or 4 ounces at a time) and restart the unit with the trigger pulled. Allow the oil to flow through the pump for 1 - 2 minutes for each treatment. Several treatments should make the pump and valve happy again.

Hope this helps.

Sep 25, 2009 | Karcher 2500 PSI Pressure Washer

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