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: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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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

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SOURCE: northstar pressure washer randomly gives pressure

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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I have a Bostitch N88RH stick nailer with contact trip. For some time, when I connected the nailer (without actuating the trigger or tip), it would fire a nail. Now, it will often fire a nail when first...

Usually, if you change the trigger valve (TVA11) the nailer will function as before. This problem could be also be caused by air leaking past the orings in the headvalve (3 orings). Easy to check. Remove the head and pull out the headvalve (white plastic piston). Look carefully at the cylinder where headvalve orings make contact and look for smooth surface. If scratched or deep groove, replace head or try to smooth out with fine sandpaper. You can make the orings fit more snuggly against the cylinder by using one or two turns of Teflon tape under the oring (just the outside orings). Apply white grease and replace head to test.
As for the trigger valve, remove the trigger to expose the valve. Check if the trigger pin moves from side to side or seems loose. If it seems loose replace the valve. If the valve has a metal pin (many have plastic (metal better)), you can pop out the valve and just replace the orings on the inner plunger. If plastic pin replace the valve. To remove the valve, remove the roll pins in the body of the gun (3mm) and apply air pressure to the gun. Use lower pressure than normal and use a glove or bunched up shop rag to catch the valve as it is pushed out by the air. Could come out with force depending on the pressure. Note the slots on the valve as they relate to the roll pins so you can reinstall correctly. Good luck.

Sep 01, 2013 | Stanley Air Tools & Compressors

1 Answer

I have a Bostitch N60FN air nailer that won't fire, I have replaced tva6 and piston stop, I have no air leaks but when I push trigger I get small puff of air from trigger valve but nothing else.

Easy test, remove the trigger to expose the firing pin and remove the nails. With air connected very quickly depress the firing pin all the way in. If the gun fires, the safey foot is not pushing the pin all the way in. Make adjustments to correct. If the gun still does not fire, the headvalve orings are leaking internally. Remove the head and pull out the head valve. Make sure that there are no fine scratches on the surface where the headvalve orings make contact to cylinder in head. If scratched, remove with very fine sandpaper. Remove the large outer headvalve orings and wind a couple of turns of teflon tape in the groove and replace the oring. This will make the oring fit more snuggly against the head. Lube with white grease and test. Good luck

Dec 28, 2012 | Air Tools & Compressors

1 Answer

Framing nailer won't fire nails

Usually safety foot is not making full contact to trigger mech. First test trigger valve. Remove nails, remove the trigger to expose the trigger firing pin. Connect air and test fire by pushing in the firing pin with your finger (dry fire onto wood or old coiled rubber hose, use very quick pushing action against trigger pin). If the gun works, replace parts and adjust the safety foot so that the lever below the trigger is pushed all the way up and lever depresses the trigger pin all the way in. Good luck

May 26, 2012 | Air Tools & Compressors

1 Answer

I have a Stanley Bostitch N80SB with the sequential trip kit. I have installed a new trigger valve assembly, and the unit now holds air pressure, but the trigger will not activate the plunger. I can...

The safety foot assembly pushes up on inner trigger lever which in turn pushes on the trigger valve. If the trigger valve firing pin is slightly shorter than the old trigger valve, or the inner lever is worn from use, the inner lever will not push the trigger pin all the way in. Examine the trigger and the roll pin that holds the trigger for wear and check that the safety is pushing up on the inner lever. If the trigger is worn replace or repair with metal type epoxy filling in worn spots and use a new roll pin.

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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. ...

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.

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RN45B secquentail trip will not work; contract trip will work only when slam hard on work. I do not know what to replace. small air leak .Can you help?

Remove roll pin holding trigger. Examine trigger for wear. A loose/ worn trigger can cause problem that you describe. Also examine the roll pin that holds trigger, if it is worn where trigger rides replace pin. If trigger and roll pin look ok then problem most likely tva6 valve. This valve has a pin that wears out. Order from ebay for under $20.00. If the gun leaks air, remove head and clean orings in the headvalve. Pull cylinder and clean orings to cylinder seal. Remove fine scratches on body of gun where orings contact metal. Use 400 grit paper. Lube all orings with silicone paste (sold at lowes in the plumbing department for faucet orings). To remove tva6 valve remove two pins in body of gun and apply air pressure to pop out valve. Use glove when you catch tva6. Use caution because the valve can come out with force (lower pressure ). Good luck

Nov 05, 2010 | Stanley Bostitch Rn45b1 Industrial Coil...

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

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No pressure when pulling trigger, trigger sticks in handle body

if air sound comes out when you press trigger your pressure regulator pin is stuck-oil gun and attach hose repeate until pin frees or remove pin and clean with brake kleaN oil and replace

May 31, 2009 | Ingersoll Rand 236 1/2" Air Impact Wrench

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Trigger on hose attachment not working so water sprays constantly

from your description, the trigger sounds like it is stuck in the release position. this sounds like a very simple repair. The component parts need to be looked at by a service shop

Jan 15, 2009 | Hoover SteamVac F5914-900 SpinScrub...

3 Answers

Powermate pressure washer Model PW0872400

pressure washers has this pressure switches where in as you press on the trigger, the washer works and if you release it, the pressure would build up high and it would trip this switch to turn off the motor or deflect the water to the by pass hose ( if the motor is not stopping) then as you press again the trigger, water should come out of the gun again but would not,

i have encountered the problem is in the pressure switch, even the pressure went down, sometimes it wont close the contact then the motor wont run ,

if the motor is continously running, then the trigger switch is the problem, the pressure excerted on the switch is so high that even if you press it , it won't open up to release the water.

what i can suggest is to tie the trigger in the gun so that it is always pressed and then just unplug the unit if you want to stop using it. it is an inconvenience but it will work.

or, open the gun and see if you can figure out why pressing the trigger would not open the switch.

another option is you can lower the pressure of the washer if it has an adjustable pessure controller. by lowering the pressure might open the switch when ever you press the trigger.

i hopw i was able to fix...

good luck,


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