Question about Northstar Pressure Washer Trigger Spray Gun 4000 PSI, 8 GPM

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Trigger Stuck When I turn on the water it shoots out and won't stop. There is no pressure with the trigger. There is a small metal pin that seems to stick everytime I apply the trigger. I have tried W-D but no results yet. HELP Steve

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SOURCE: pump loses pressure after you use it a while even

looks like you need a new diaphpragm in the pump unit

Posted on May 23, 2009

  • 174 Answers

SOURCE: northstar pressure washer randomly gives pressure

Hi:
You need to find the bypass (unloader) valve and grease it with a good waterproof grease. Sorry, I cannot find a pic for you

Posted on Sep 03, 2009

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My electric Campbell hausfeld 1750 psi won,t always start when I pull the trigger .sometimes it will quit while running. the motor and pump seem to be free. it works good while it is running. CR


Hi , i'm not familiar with the machine so without model numbers it is hard to diagnose.
if it is a trapped pressure unloader valve, ie the motor turns off when you let go of the trigger , then it is possible for it to be a pressure switch causing problems. the pressure switch may turn it off immediately you let go of the trigger or it may have a delay stop on it, where it will turn it off after a predetermined time interval. it is quite common for springs to break or microswitches to fail in these switches.

Oct 15, 2013 | Pressure Washers

2 Answers

My washer makes a loud pulsing noise when not being used,as soon as I pull the trigger it works fine.


sounds like your unit has a bypass problem either needs adjustment or replaced

Oct 14, 2012 | Karcher Pressure Washers

1 Answer

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.

Oct 13, 2012 | Pressure Washers

2 Answers

As soon as I turn the water on, it comes out of the gun and high pressure turbo wand even with the machine off. I used it yesterday with no problems. It does this without even pressing the trigger. ...


Hello,
This part should be available from the manufacture, have you check their website. It is normal when you turn the water on for a small string of water to come out the gun when you press the trigger even when the engine is not running.
Thanks

Jun 03, 2011 | Black & Decker 1700 PSI Electric Pressure...

2 Answers

Shuts off when high pressure wand is attached


Hi Brian. Welcome to FixYa I am Kelly. This sounds as if the bypass / unloader valve is stuck in place and the pump id dead heading causing the unit to shut off. (There is most likely some corrosion in the unloader / bypassy valve assy / housing. What you can try is pouring at least 3 oz of oil into the water inlet assy and briefly.... like VERY briefly switch the unit on then back off. Then let it sit over night. The next day connect everything for normal use then turn the unit on again briefly. Use a bucket to PURGE the oil that you put through the system by squeezing the wand Power SW Off until the oil purges. Then switch the unit on and rapidly trip the trigger at 0.5 sec intervals or less. If it trips off wait 5 mins and try it again. Do the rapidly tripping the trigger on the wand routine for about 20 seconds. Your forcing the bypass unloader valve to cycle trying to clear out any debris / corrosion.
This works often and well. There are exceptions. Hopefully it will work for you.

Thanks for using FixYa.

Kelly

May 07, 2010 | McCulloch FHH18A Electric Pressure Washer

1 Answer

Gun wil not trigger after stopping


I'm not real clear on what you're saying, but I think it's that the trigger will not shut down the pressure as it should. It stays stuck on. The other info is how long you've had the washer, but my hunch is that maybe you have hard water, and the deposit build up may be getting the trigger stuck. Try spaying some penetrating oil inside the wand to loosen any deposits that may have built up.

Aug 11, 2009 | Karcher PSI Electric Pressure Washer

1 Answer

Power washer problem no pump action


sounds like nozzle is blocked.small bits of grit jam nozzle unscrew and make sure its clear turn water on and pull trigger to see if gun trigger works,then refit nozzle check again for spray.if clear start up and try out.if no go then pump probably needs cleaning and relubing seals.

Apr 20, 2009 | Comet Pressure Washers

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

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