Question about Stanley Bostitch Coil Framing Nailer

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Firing Pin doesn't return

I'm working on a Bostich N63CP Coil Nailer. I took it apart to find the firing pin guide shattered so I replaced. However, the tool still doesn't work. The pin fires but then will not return. It can be pushed back into place w/ an allen key. Seems as if there is no air pressure to return the pin. How do I fix this?

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  • 154 Answers

The piston is returned to its firing position by air from the trigger valve after the piston has fired. It relys on the piston sealing against the bumper at the bottom of its stroke, if the bumper was damaged when the driver shattered or it was put in upside down the piston will not return. Also the piston uses air fed into the return chamber from the little holes in the cylinder, if the seal over these holes is damaged the piston may not return. Basically change the bumper and the check seal on the cylinder.

Posted on Aug 05, 2009

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Posted on Jan 02, 2017

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