Question about Stanley Bostitch N88rh Framing Nailer Driver Piston 158582

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The piston on my framing nailer is stuck in the "out" position - how can I fix the problem?

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  • Stanley Master
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Assuming no air leaks, could be as a result of several problems. Things to check/try. Push driver up manually to full top position. This will reset the driver if it was stuck due to nail. Check for other debris in path of driver. If it very difficult to push up you will need to remove head and pull driver to check for bent shaft. If it pushes up easily and drops back down under its own weight, it needs a piston oring. If it pushes up easily/light force and stays up, fires once and stays down, then you need to replace the check valve (band or oring on the outside of the cylinder covering a row of holes). Parts are available at www.toolpartsdirect.com
If very stuck, I use a piece of driver that fits perfectly into the bottom of the gun and hit with large copper or brass hammer. If you must use a heavy hammer, remove the head and place body of gun on wood to prevent damage. Good luck

Posted on Oct 03, 2010

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Posted on Jan 02, 2017

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1 Answer

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