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DRIVER DOES NOT RETURN ALL THE WAY TO THE TOP

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What air pressure are you using? Anything under 80psi may not be enough to allow the piston to fully return. 90-110psi is the most common range to operate nailers and staplers. A bent driver can also be hanging up causing it not to return. This is most common on 18 (and some 16) gauge brad/finish nailers since they usually have a pretty thin driver blade.

Posted on Mar 06, 2012

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Fires first nail will not fire second nail


Ez test. With nails removed, and door open driver should be at top of cylinder. If driver is down replace piston oring. If driver is up, lightly strike nose of gun against softwood. The driver should stay at top. If driver drops with light tap replace piston oring. If driver stays at top dry fire the nailer against softwood. The driver should hit the softwood leaving a mark and return to top. If driver stays down or does not travel all the way up pull the cylinder and make sure checkband is installed. Checkband is oring or rubber band covering series of holes on lower part of cylinder. Good luck

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Several conditions will cause driver not to return to top of cylinder. The driver oring should not be too tight nor too loose. It should take very little effort to push the driver back up. If hard to push back up, replace the oring or lube. Make sure that the driver is not bent and binding in the housing. Finally, there is a check band or oring installed on the lower part or the cylinder. Remove the head and pull out the cylinder. Look for a series of small holes drilled into the cylinder. These small holes should be covered by a snug fitting oring or a band made of rubber. You will usually find the old part within the space. Replace with anything that fits. If the check band was in place and the driver will still not return, most likely air is leaking down thru the nose of the gun past the driver seal. Easy fix, make a seal out of inner tube material and cut hole for driver so that the seal fits snuggly around the driver. This seal will increase the air pressure in the lower part of the gun and push the driver up. Good luck

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Assuming that the nails are moving ok down the rails and the pusher is in good order, if the driver does not return to the top position, the nails will not move into position. Remove air line to gun. Use metal rod to push driver to top position and verify that nails move into position. If the driver was at the top position, check for debris in rails or wrong nails. Place a strip of nails on the outside of the rails and align the nail heads with the rails. The first nail should align with the path of the driver. If the first nail head is tilted back away from the path of the driver, the driver will just push nails back into the rails and slip past. If nails are correct and driver does not return to top, suspect worn piston oring or cracked lower bumper or lack of lubrication.

Aug 24, 2011 | Stanley Bostitch N80s Nailer -rebuild...

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My Bostitch MIII floor stapler is not driving staples. I partially drove one staple with a glancing blow then drove another on top. I cleared the jam and now it will not feed staples; It fires...


Slight damage to driver will prevent it from returning to top of cylinder (assuming that nailer worked correctly before double fire). Easy to check. Remove airline. Use metal or plastic to push driver to top of cylinder (should easily move). After the driver is at top, see if first cleat moved into proper positon. If cleat is not in position, check pusher and rails for debris. If cleat is in position, activate nailer to check for proper function. If driver does not return to top of cylinder and was difficult to push up, pull out driver and check for bent /damaged driver and replace orings and lower bumper while apart if parts look worn. Good luck

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1 Answer

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The check seal around the lower part of the cylinder is what causes the driver to return. It looks like a band and covers a series of holes. If the check seal is in place, then check the condition of the lower bumper and seal under the bumper. If the lower bumper is cracked the driver may not return. Parts are at www.toolpartsdirect.com. Good luck

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I assume you are talking about a air nailer,when the piston doesn't return it is usually a broken driver or a jamb in the nose piece. Hope this helps, if so give us a 4 thumbs up. THANKS

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You have some blown o-rings inside the head that won't keep air where it's needed to return the driver back to the top. Porter Cable used to make a driver maintenance kit (PN60011) but it's no longer available through them. You may be able to find it on a site like eBay. If not you'll have to order each o-ring seperately from a Porter Cable/Dewalt service center.

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