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Bostitch stapler T40S2 has air leak at trigger. I need repair instructions to replace orings

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Go to the Stanley Bostitch website. Click on schematics & parts. Find your model number in the drop down list. There is a list of parts and pricing. Just above the parts is a link for the schematic. Honestly, I worked on these things for years. It is best to replace the entire trigger valve. It comes as a kit with instructions grease, and a little tool to hammer your pins out. Lemme know if this helps. Please rate me

Posted on Jun 18, 2009

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1 Answer

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Most likely the orings or seals in the headvalve are not making perfect seal. Remove the head and pull out the headvalve. Apply plenty of white grease to orings and test again. If the gun fires, then will need oring kit soon, or just keep using plenty of grease. If the gun still does not fire, check that the safety foot is depressing the trigger valve all the way in. Good luck

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This problem is caused by air leaking past orings in the head valve. Remove head and pull out the head valve. The metal surface on the head where oring makes contact should be smooth and oring should fit snugly. Of scratched or deep groove, or if oring is worn, the gun will not fire (sand with very fine paper or replace head). Also examine the headvalve where smaller oring makes contact. If small scratches are visible, remove with very fine paper or replace. To test if head valve is the problem, remove head and headvalve and apply plenty of white grease where orings make contact and replace head then test. If the gun fires, air was leaking past the orings. Good luck

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1 Answer

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...


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/

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1 Answer

I have a bostitch floor staplet 111 and when I hook up the air to it air leaks out of the top and runs all of the air out of compressor please help


Below the rubber bumper is the poppet actuator. The actuator has 3 screws that attached it to the actual poppet below. If the screws do not seat well and/ or if the gasket between these two parts is bad, air will leak out the top. Remove the poppet actuator to check oring on the actuator and the surface of the body of the gun where the oring makes contact. Look for damage to actuator or side wall and repair as needed (sand sidewall where oring makes contact with very fine sandpaper if scratched or dented). If oring does not fit snuggly against sidewall, use teflon tape below oring. Parts are available at www.bostitch.com.

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1 Answer

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Your nailer uses a trigger valve (could be part # tva6 cost about $20, need to look up) and is sold at www.bostitch.com or generic valves sold on ebay . If you have a source for orings, you could try to repair the valve. Remove the roll pin that holds the trigger to expose the tva6 valve. There are roll pin/pins that hold the valve in just above the valve in the body. Remove these pins and apply air pressure to gun to pop-out the valve. Use caution when you do this. Remove nails, lower pressure to gun and use glove or rag to catch valve because it could come out with force. With tva6 valve in hand remove two pins that hold valve together and remove inner plunger. The middle oring on plunger is cause of leak. Try using an oring about same size as the broken seat. It must fit pretty tight to work. If you had a small leak it could be that the firing pin orings fit too loose or just too worn. Use silicone lube or oring lube on the orings and the valve port. Good Luck on your repair and email if you have other questions

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1 Answer

I have a stanley bostitch framing gun model f28ww and i it leaking air through the trigger what part do i need to get my gun up and gunning again?


Your nailer uses a trigger valve (part # tva6 cost about $20) and is sold at www.bostitch.com or generic valves sold on ebay . If you have a source for orings, you could try to repair the valve. Remove the roll pin that holds the trigger to expose the tva6 valve. There are roll pin/pins that hold the valve in just above the valve in the body. Remove these pins and apply air pressure to gun to pop-out the valve. Use caution when you do this. Remove nails, lower pressure to gun and use glove or rag to catch valve because it could come out with force. With tva6 valve in hand remove two pins that hold valve together and remove inner plunger. The middle oring on plunger is cause of leak. Try using an oring about same size as the broken seat. It must fit pretty tight to work. If you had a small leak it could be that the firing pin orings fit too loose or  just too worn.  Use silicone lube or oring lube on the orings and the valve port. Good Luck on your repair and email if you have other questions.

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1 Answer

Air coming out the trigger of a stanley air gun cylinder does not come down stanley Bostitch nail gun /T40S2


Go to the Stanley Bostitch website. Click on schematics & parts. Find your model number in the drop down list. There is a list of parts and pricing. Just above the parts is a link for the schematic. Honestly, I worked on these things for years. It is best to replace the entire trigger valve. It comes as a kit with instructions grease, and a little tool to hammer your pins out. Lemme know if this helps. Please rate me

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2 Answers

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I have repaird hundreds of nail guns with a problem similar to yours. Depending on the brand and model, the problem can be repaired by checking the following. Headvalve orings should be checked for wear and any surface that the orings contact must be smooth and free from scratches. If the surfaces are scratched try to smooth with fine sandpaper and use light grease instead of oil when assembling. The safety contact foot may not be reaching high enough into the trigger to properly push in the trigger button. Check for worn spots on the trigger that may be filled in with epoxy, loose fitting trigger caused by worn roll pin or retaining pin. Some of the trigger valves as used on many bostitch nailers (tva6 valve) used a plastic pin which contacts the trigger. If this pin is loose or worn the valve should be replaced. Some tva6 valves have a vinyl looking sort of oring that fits too loose on the spool. This vinyl oring in not available by itself but if the oring fits too loose the gun will not fire and leak air. On bostitch remove the trigger and the rollpins holding the trigger valve and apply air to gun to eject valve. (use heavy glove to catch valve as it will come out with force)

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