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My driver doesn't come back far enough to pick up the next nail

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  • David Ford
    David Ford Oct 03, 2010

    could be a jammed nail in the magazine or bent driver blade or the o rings might be worn. the header does not specify what brand or model so I am just giving you something to look for. If you need more help give me the brand and model number and I will try

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  • Master
  • 1,383 Answers

Many causes for this problem. Some things to check. Push the driver up by hand to see if it moves easily /hard. If hard, check for bent driver or dry cylinder. If it moves easily, check piston oring too worn and /or air could be leaking down past the bumper area. Most guns have very close fitting bumper or a seal below bumper. If too much air leaks down past bumper driver will not return fully. Check seal could be loose or broken. Remove cylinder and look for check seal covering a row of holes on outer/mid to lower part of cylinder. could be a band or oring and should fit rather tight. If ok only other parts to check are the headvalve and piston stop. Piston stop should not have cracks or missing pieces (piston stop slows/stops piston when it returns to top). Head valve should be well lubed. Good luck

Posted on Oct 03, 2010

  • 1 more comment 
  • craigruss800 Oct 04, 2010

    there are all new seals and a new driver installed in it, tought that would fix it but it didn't.

  • John Trevino Oct 04, 2010

    Lots of new parts in gun then, good. Try some tests. Assuming no leaks. There needs to be air pressure under the driver piston to push driver up. Check valve that sets on a row of holes on outside of cylinder must be very snug. Some brands use a band others use orings. I have found that on many guns too much air leaks down the nose and cant push up the driver. Some brand of nailers use a washer below the bumper that fits snuggly on the driver, however on guns that do not I cut a thin piece of rubber (like tire tube) that fits nicely below bumper and make small hole for driver to fit thru. The goal is to create a nice seal at bottom of gun. Now test, if works ok your done. If no joy, problem is in valve head/piston stop. First remove head, to test seals. Push down valvehead and cover small hole on gasket surface with finger. If seals are good the valve will stay down under vacuum and come up when you release hole. If test ok then remove valve (plastic or metal piston that has orings) and pull piston stop and spring. Piston stop must not have missing pieces or cracks. Reinsert piston stop into valve and check for nice fit. Stop should fit into valve snuggly and stay put. It should not take much pressure to snap into seat. If it fits too tightly into seat/ then hard to remove from seat then problem, you could sand outer surface or replace (as driver is being pushed up to top the air above the driver must be expelled easily thru the valve head/piston stop/top of head; If too much resistance piston will not reach top ). Good luck and let me know your progress.

  • John Trevino Oct 04, 2010

    When you insert piston stop into valve for test fit put it in without the spring, you are only testing the fit of the stop into valve. (when all parts are assembled and the gun cycles the piston stop overcomes the power of the spring and makes contact with the seat) One more test after you reassemble. Connect air to gun and dry fire gun into rubber mat or soft wood but continue to hold the gun against wood/rubber and continue to hold trigger. Driver will stay down under pressure, during this test no pressure should leak out of nose or head., if leak out nose, lower bumper is problem, if leak out head piston stop is problem.

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