Question about Air Tools & Compressors

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Do you see an oil port or small hole in and around the trigger?

The trigger that you use to actuate the gun operates a plunger diverting air from a the storage chamber into the barrel. This plunger usually has a least one and usually two o-rings. If there is an oil port or small hole on the body above the trigger and either forward or to the rear of the trigger, this may lubricate the plunger enough to revitalize the o-rings and create air from the storage chamber escaping at the trigger.

O-rings do shrink in a drier climate should you be in one. They also shrink over time. Lastly, you may have one with a tear in it and this could also cause the leak.

As I seem to recall Bostitch is one of those companies that encourages their equipment be returned to a factory service center. And air guns being somewhat dangerous this would normally be the case.

Can you supply the model version and perhaps I can also provide you with a parts explosion that will show you the elements to access should you desire to undertake the replacement of the o-rings yourself.


Posted on Sep 29, 2008

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Replace the trigger valve assembly (TVA).

Posted on Sep 29, 2008

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  • Todd Gale
    Todd Gale Sep 29, 2008

    If you go to the link below you can select your model number and you will see the parts list and instructions for the repair. It is not that difficult. If you provide me with the model number, I will get you the information.

  • Todd Gale
    Todd Gale Sep 29, 2008

    Worldvet, please do not answer questions you are not qualified to answer. This is a dangerous repair if not handled properly and your answer about replacing an o-ring is not correct and could cause this person to suffer injuries. Stanley/Bostitch makes their repair procedures available to the enduser and does not require any such repair policy. I would appreciate you not answering posts you are not qualified to just for the sake of making a few dollars. I will report your actions in the future.

  • Todd Gale
    Todd Gale Oct 03, 2008

    Please rate this solution.



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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.
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sounds like the rubber seals have dry rotted prob from not oiling it enough, but you should be able to go on the Bostitch web site and order new rubber seals for the gun

Sep 29, 2008 | Air Tools & Compressors

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