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Re: 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.
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n80 coil nailer is a very powerful nailer used for hard wood. If the driver is setting nails too deep, adjust safety foot to the lowest level. Install safety foot no-mar boot to lift the gun even higher. If still too deep, most likely the lower bumper inside the gun is worn-out or cracked. Easy test. Remove nails and connect air supply. With trigger depressed, push and hold the gun against work (I use an old rubber hose tightly coiled up). This will fire the gun but keep the driver down allowing you to examine the tip of the driver. The driver should extend out past the nose less than quarter inch. If the driver is extending too far, most likely bumper is worn out. If a large quantity of air is leaking out the nose of gun during the test, indication that lower bumper is cracked. Good luck.
Bad or dry feed piston o-ring or a loose feed piston as they are held on by a metric allen screw that will sometimes back out. Use blue Locktite when reinstalling the screw. It could also be the feed spring but they rarely fail on the larger framing nailer.
Usually this happens with the lack of lubrication as well as small leaks in the O-ring seals. I would closely examine the seals. See the link below to see a parts breakdown for Bostitch nailers. Enter your model number and you will see the parts breakdown and part numbers. Use the diagrams as a guide for disassembly and reassembly.
Feel free to post any additional questions that you have. I have had my nailer for over 20 probelm free years. The key is lubrication.
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
If the o-ring is the problem, you can get the o-rings separately. I believe that the o-ring kit runs about $12 and contains all of the rings. If hte problem is internal to the trigger assembly, the entire assembly should be replaced. I have replaced the o-rings twice and the trigger once in my N80 in 24 years of service .
The F28WW takes 28Deg nails that are collated with wire, so your nails won't work in that gun. The N80SB is also a 28Deg nailer so your 30 Deg nails won't work in that gun either.
Sorry about the bad news but it looks like your going to have to spring for new nails
If the nailer is passing air from directly out of the trigger valve, it must be replaced (P/N-TVA11). If it is passing air from anywhere else, (eg back cap or front ) it needs an O-ring kit (P/N- ORK11)
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