My N80S sinks #12 nails about half way. Most times it will only fire a single #12 nail. #8 nails work great. I have installed the basic O-ring kit, but still no luck. I have also replaced the large O-ring "check valve" on the lower outside of the cylinder. All parts have been cleaned and oiled with air tool oil. I have 120psi available and a very large compressor.
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If the trigger is set to single fire, you will need to place the gun against the work then pull trigger as you have done. Try setting the trigger to bump fire and try again. If hear a thump inside the gun, remove the head and check that the head valve in not stuck from lack of lubrication. Easy test, remove the nails, remove trigger pin, remove trigger and manually push trigger firing valve. If the gun fires then suspect faulty trigger or safety arm not lifting enought to activate the trigger valve. Good luck
Paper collated will work. Maze nails part # PCP28325131 works on many 28 degree guns including yours. Only advantage that I can see with using welded is that the nails will take more abuse on the job site including getting wet. Paper collated can brake apart easily but dont worry too much about the difference. I would buy the least expensive or available but I like the idea of using made in USA of maze nails (not available on all areas of US). Good luck
On many floor nailers, counter sink is controlled by the thickness of lower pad. Your nailer most likely uses several different thickness of pads bolted to the bottom surface of the gun (usually white vinyl /plastic). The thinner the pad, the deeper the nail will set. Good luck.
If no air is leaking from gun, miss-fire is usually caused by worn or too tight piston oring or lack of lubrication. Easy test. Disconnect airline, remove nails, point nose of gun up then down. Driver should stay in uppermost position. If driver moves up then down within gun replace piston oring and retest. Set pressure to about 100psi. Good luck with repair.
Assuming that the nails are moving ok down the rails and the pusher is in good order, if the driver does not return to the top position, the nails will not move into position. Remove air line to gun. Use metal rod to push driver to top position and verify that nails move into position. If the driver was at the top position, check for debris in rails or wrong nails. Place a strip of nails on the outside of the rails and align the nail heads with the rails. The first nail should align with the path of the driver. If the first nail head is tilted back away from the path of the driver, the driver will just push nails back into the rails and slip past. If nails are correct and driver does not return to top, suspect worn piston oring or cracked lower bumper or lack of lubrication.
I found your post a couple times, when you remove the nails does the piston/driver slowly come down? Also do you hear any air leaking around the cap? When was the last time you had it serviced. It sounds like the o rings are dried out or worn flat and possibly a seal on top of the cylinder might be damaged. Not to worry though, it is rather inexpensive to repair all that yourself if you are handy with tools. Let me know and I will find a breakdown for you before you attempt anything