Question about Stanley Bostitch F33PT 33Degree Paper Tape Framing Nailer Metal Connector Nailer

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Hi there, bostitch framing gun f33 pt leaks air around trigger when i try to shoot nails.only when i use the trigger air escapes,otherwise it is sealed .just want to make sure what is your advice , before ordering spares.thanx from tasmania. cheers uwe

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  • Stanley Master
  • 1,383 Answers

There are about three issues with this gun that could cause your problem. The safety contact arm not depressing the trigger pin fully, worn trigger valve (tva6), or leaking orings in the headvalve. Easy tests. Remove the nails, and remove the trigger to expose the tva6 valve. Reconnect air and with very quick and firm action, depress trigger pin all the way in. If the gun fires, adjust safety foot and trigger so that the trigger pin is depressed all the way in each time that you fire the gun. If the gun does not fire, remove the head and remove the headvalve. Examine the surface/s where Orings make contact with magnify glass looking for fine scratches. Sand with 400 grit paper. Orings must make good contact here or gun will not fire. Lube orings and surface with silicone paste lube (sold at Lowes in the plumbing department or swimming pool supply store). If no fine scratches and surface looks smooth, replace Orings in head and the tva6 valve. Good luck with your repair/

Posted on May 30, 2011

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Posted on Jan 02, 2017

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1 Answer

I have a Bostitch coil framing nailer M#N80CB-1 which was working fine one minute, than after setting it down for a minute it is leaking air under the triggger and will not fire after the first nail.


Air leaking at the trigger is caused by faulty orings in the trigger valve. You could replace the orings in the valve or replace the whole valve (not expensive on ebay, look for generic tva6 valve usually less than $20). Good luck

Nov 30, 2013 | Air Tools & Compressors

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I have a Bostitch N80S stick framing nailer that leaks air from the trigger area. I replaced the entire trigger valve with a new single fire trigger to see if the old bump fire trigger was the problem


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Apr 10, 2013 | Stanley Bostitch Nail Gun

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I put a new o ring rebuild kit in my Bostitch N80 sb framing nailer. I replaced every o-ring (including the trigger valve assembly


If the new trigger valve leaks air when you connect the air supply, most likely defective valve or air is leaking past outer trigger valve orings due to debris in the slot or new orings were cut when the valve was pushed in. If air leaks when you depress safety to fire gun then most likely problem is in the head valve or safety foot is not pushing the firing pin all the way in. Easy test, remove nails and remove the trigger to expose the firing pin. Connect air and very quickly depress the firing pin all the way in. If the gun fires, adjust the safety foot as needed. If the gun does not fire, remove the head and check headvalve orings for good snug fit against the cylinder within the head. The surface were orings make contact must be very smooth and not too deeply worn. If you notice fine scratches remove with fine sandpaper. Reinstall head using plenty of white grease on all the orings within the head and retest. Good luck

Feb 10, 2013 | Stanley Bostitch N80CB Coil Framing Nailer

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When i connect the air it sounds like all the air is escaping.


depends on where air is escaping from. If it is around the trigger then you need a new trigger valve (I have detailed instructions in the tip section on repair) If it is leaking thru the cap you have a pinch o ring or stuck firing valve. Let me know exactly where air is leaking and I will try to pinpoint the problem for you.

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I have a framing nail gun and air is leaking around the trigger. How do I get the trigger off to replace it or replace the rings?


in the tip section I have detailed instructions on how to remove the trigger valve assembly. You might be able to click on my icon to get to the page, let me know if you need more assistance.

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sounds like the trigger valve has a broken o ring and would need replaced. you can go to Bostitch.com and order one for it, they are not that hard to install.

Jan 16, 2010 | Stanley Air Tools & Compressors

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How do you safely remove jammed nail gun?


Not sure exactly what Bostitch framer model you have, but if it is powered by compressed air, as long as you remove the air hose from the nail gun, there should be no risk of the nail gun firing while you remove the jammed nail. There should be a way to access the driver area from the top of the nail gun, even via a latch or a couple screws. Remove the top part of the driver area and that should give you access to the jammed nail, which you can remove. Use long nose pliers or something similar if the nails are really stuck.

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1 Answer

N80sb-1 stanley bostitch framing gun.


Yes your nailer will drive other sizes of nails. For info and parts go to www.bostitch.com and look for the support tab then select service parts. Here you will find parts list and manual. To remove the tva11 trigger valve remove the retainer pin (the pin is 3mm) for the trigger and remove trigger. Next remove roll pin/pins that retain trigger valve. Use heavy glove to catch trigger valve as you apply air pressure to gun. The valve could pop out with great force so try lowering the pressure to gun. Before installing the new valve, check the opening for sharp edges which will cut orings. Good Luck and email if you have more questions.

Mar 14, 2009 | Stanley Air Tools & Compressors

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