Tip & How-To about Tools & Hardware - Others

How to remove leaking trigger valve on Stanley-Bostitch Nailers

If you are having a problem with air leaking out of the trigger area it is usually a split o ring on the valve assembly. To remove the trigger valve there are 3 roll pins that have to be removed and usually one is shorter so lay them out in the order removed first the trigger and the 2 holding the valve in place. Next get a shop rag or glove and place under the valve holding it in place while holding back the collar on the quick connect (so it won't lock) push it onto the tool and the valve will JUMP out of the tool. Get the replacement valve and before reassembling lightly coat the o rings, you will notice 2 cutouts on the valve which must be aligned with the roll pin holes, push the new valve in and align the slots for easier assembly reassemble in reverse order.

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1 Answer

all the sudden the nail gun stop working, pull the trigger air leaks out at trigger area


I had a similar problem with one of my nail guns. What I found was a small rubber o-ring in the trigger mechanism had split. Once I replaced this the problem was corrected and the unit functioned fine.

You could replace the whole trigger assembly for about $35. But if you remove the assemble and replace the split-ring this would only cost a couple of bucks at most.

Trigger assembly shown below. ereplacementparts.com is one possible source for the trigger assembly others can be found on the Internet.

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Aug 21, 2011 | Dewalt Heavy - Duty 31° Clipped Head...

1 Answer

air is leaking from somewhere around the trigger and the nailer will not fire...the gun is only about 3 months old


I would take it back for warranty repair if it is that new. If not I have detailed instructions on how to remove the trigger valve assembly from the tool. If it is leaking air it is probably a split o ring on the valve.

Jun 02, 2011 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

1 Answer

air blows thru the trigger on my bostitch air nailer model 28ww ho do you tear down to replace the O ring?


remove the roll pin holding the trigger latch assembly and then the 2 roll pins on the valve itself. Get a shop rag and place over the valve and then while holding the collar on the air fitting hold the rag in place and push the fitting onto the air chuck and the trigger valve will pop out. the remove the 2 pins holding the bottom of the valve together and remove till you get to the split o ring on the assembly.

Nov 21, 2009 | Stanley Air Tools & Compressors

1 Answer

Air is leaking from the trigger and preventing operation


the o ring in the trigger valve is split. If you can find one at a local shop they are sometimes called a "purple o ring" from the kits. If not you will have to replace the whole trigger valve assembly.

Nov 03, 2009 | Stanley Air Tools & Compressors

1 Answer

leaks air from trigger


there is a split O ring on the trigger valve assembly, referred to as a PURPLE o ring, from the kits used to rebuild the tool. I Would check with a local repair shop and see if they have one if not you will have to replace the valve assembly, Let me know and I will try and help further.

Oct 27, 2009 | Stanley Tools & Hardware - Others

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