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Nv45ab won't advance nails

Removed, cleaned, and lubricated nail feeder assembly. The feed plunger moves freely with no air supply attached. With air applied, feed plunger moves all the way toward piston drive shaft and stays in that position even when gun is continually fired. Feeder piston doesn't move in return direction. What is the movement of air in the gun that moves the feed plunger when the gun is fired and when trigger is released? What causes the change in direction of the feed plunger? Maybe I should be looking for the problem elsewhere instead of the feed plunger assembly.

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  • lips0 Jan 24, 2013

    There are two allen set screws located in the exhaust cover. These screws were turned all the way to the bottom on the cover which probably blocked off the air supply to the feed plunger assemby. I backed off the screws so they were almost to the top of the cover. The NV45AB now advances nails correctly. I couldn't find these screws listed on the NV45AB diagram or parts list and there is no reference to adjustments in the repair manual. Newer guns probably don't have these allen set screws anymore.

  • lips0 Jan 31, 2013

    Backing off the allen screw apparently opened up the tube air line to the feeder piston assembly. That along with disassembling, cleaning, and greasing the plunger corrected the problem. It now works great. Thanks.

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The allen screw/s that you mention are there to plug holes where automatic equipment would normally connect (such as automatic nailing machines) . This is only a plug and should not be driven in too far. I have also seen allen screws installed in the head to repair small crack/s.

Posted on Jan 31, 2013

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  • Expert
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Make sure the feeder spring behind the feeder pawl isnt broken or missing. it pushes the pawl to force the next nail

Posted on May 29, 2014

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SOURCE: How do you safely remove jammed nail gun?

Not sure exactly what Bostitch framer model you have, but if it is powered by compressed air, as long as you remove the air hose from the nail gun, there should be no risk of the nail gun firing while you remove the jammed nail. There should be a way to access the driver area from the top of the nail gun, even via a latch or a couple screws. Remove the top part of the driver area and that should give you access to the jammed nail, which you can remove. Use long nose pliers or something similar if the nails are really stuck.

Posted on May 31, 2009

  • 131 Answers

SOURCE: paslode nail gun not firing

Hi,
Yes you need to oil driver blade piston.
You need to check for spark. With no nail or gas in it. Take of main cylinder(4bolts on top, 2 bolts on nose. And then put in battery. And then push upper switch(behind roller at top) and the fan will come on. And then pull the trigger. You should have spark.
Thanks,
Jeff

Posted on Jun 23, 2009

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1 Answer

My nv45ab2 will break the wire 3 to 4 nails back and after those feed thru it of course doesn't have a nail to shoot. I replaced the part that advances the nail


Hi Brent:
I'd start by doing a thorough maintenance procedure.
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- Replace any defective parts.
- Re-assemble and lubricate appropriately.
Connect to air and test.
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Most likely the driver is not returning to top of cylinder, thus driver blade does not allow nails to move into position.
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1 Answer

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1 Answer

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1 Answer

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1 Answer

Gun is full of nails, but acts like it is empty (the plunger won't advance). You go to tap it with the trigger pulled, and it just does nothing. Seems like firing pin is not getting air or somet


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2 Answers

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On the side of the gun away from the side you load the nails on there is a small cylinder with a piston inside that attaches to the feeder pawl. If air isn't getting to the piston or the piston's o-ring or spring is damaged, it won't cycle properly to advance the nails.
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2 Answers

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