Question about Stanley Bostitch N80s Nailer -rebuild Parts O`ring & Seal Kit

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N80S won't completely sink #12 nail

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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  • David Ford
    David Ford May 11, 2010

    by basic o ring kit I take that to mean the piston and firing valve and the trigger? How are the bumpers in the bottom of the cylinder? Also how is the seal on top of the cylinder? When you rebuilt this tool did you grease the orings. And by shooting a single nail is the piston not returning to the full rest position. If not it could mean that the cylinder is dry and not retracting the piston (it should move freely) or the firing valve might be sticking. Let me know


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It sounds like its not oiled enough possible bent piston due to jamming.

Posted on Feb 20, 2009

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