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Hi I have a np80

I ran out of nails not knowing it and continued to use gun..think I damaged something. Hammer must be pushed back in manually after each nail is shot or if gun is held foward facing down plunger comes out under gravity towards nail,hence allowing air to escape from somewhere. Thanks very much Joe D.

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Joe it sounds like you have damaged the return puck inside the cylinder. when the piston bottoms out their is a rubber puck inside that cause recoil.over time it can become hard and no llonger resiliant - when you dry fire it can shatter or crack . if it does not have this then it just needs oil . are you oiling every use? usually 3 drops at start of daywill run them for years. at any rate you will have to do the following to confirm. diconnect air - remove four crews that hold cover or back of cylinder- should be obvious-lift off cover - this will expose back of piston whick is connected to drive pin. you mat have to push it backwards through guide late to eject completely.Inspect cylinder and piston -is it dry? no oil? inspect o rings around piston there will be two one at top and one at bottom. oil with damp oil cloth and reassemble it reverse. take care to twist cylinder to line up drive pin- this is critical.Do this and get back to me. good luck

Posted on Oct 22, 2008

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Posted on Jan 02, 2017

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4. Check spring return. Sufficient pressure must be maintained or the nails will not feed properly. Misfires, incorrect feed, jamming etc.
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