SOURCE: Bostich framing nailer leaks air out driver hole
Generally, air leaking from the nose of the gun is caused by the vinyl headvalve/cylinder seal. It is installed on the headvalve and snugs against the cylinder. I would also check the cylinder ring supporting the cylinder that is visable when the head is removed. The cylinder ring is made of white plastic and has an oring on outside edge and seals against the cylinder with another oring. The ring tends to crack allowing air out nose. Some cylinder rings were made of metal, which is better and do not fail. Metal or plastic, check the orings there. Not to worry, these parts are not expensive and available at www.bostitch.com. enjoy
SOURCE: Bostich N80 Framing nailer
Sorry about the delayed response. This unit needs to have the O-rings replaced. The return of the firing pin is not happening correctly. This means that the pressure release holes are still engaged. When the pin pushes out the nail, the return should cause the holes to get covered. If there is an air leak, the return will not complete resulting in an even larger air leak which is what you are now seeing. This is a relatively simple repair for any shop that handles these and would be considered a standard maintenance effort. These are decent tools and with proper maintenance will last for years. Mine is over 22years old and going string.
Dan
SOURCE: constant air leak
Sounds like you need a repair kit or take to a tool company that installs the kit.
SOURCE: my bostich framing nailer leaks air from top and
do you already have the rebuild kit??. Could be a cut o ring the cylinder seal might be cracked , there are quite a few items to check, specifically where is the air coming from, the exhaust, if so then I would look for the items mentioned. It would be best to download a breakdown for the tool and if you are mechanically inclined start disassembly laying parts out in the order removed and also maybe take a few quick pics to help you in reassembly. they are not that hard to rebuild. Let me know and I will see about the breakdown and rebuild kit for you but I need the model number and give me some general area you are in and I will try and find parts somewhat locally
SOURCE: air leaks around green cylinder at trigger area
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 holidays.
you need an o- ring kit from bostich
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