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Senco J pneumatic stapler Hammer not returning up into chamer

My Senco J pneumatic stapler shoots a staple but the hammer does not return back into the chamber. What could be the problem? Have changed all the washers.

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Posted on Jan 02, 2017

  • 28 Answers

SOURCE: Can not get the hammer to line up to hit the staple.

Take the magazine out of your stapler and visually inspect the driver head for any damage. If there are any nicks, worn edges, or warps, this will cause the problem you are experiencing. Usually you can remove the driver head and pound it flat then use a fine steel file to remove any imperfections with great results. If this doesn't help, feel free to contact me at

Posted on Mar 09, 2010

  • 112 Answers

SOURCE: Staples will not shoot flat. Have to hammer them

well most home hardware ones all do that if used on anything hard/heavy timber.....if it is a heavy industrial one it may need anew spring.

Posted on Jul 24, 2010

  • 359 Answers

SOURCE: after shooting a staple the driver does not return

obvious answers are 1. a burr on the striker, 2. a bent striker. 3. a trapped staple 4. a broken return spring. other than that I cant help you without seeing it.

Posted on Feb 02, 2011

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