Nail gun wont fire nails - RTO PasLode 900420 Impulse Framing Nailer

If gun firing but nails not being driven could be one of two basic problems:
1. Nail jammed in magazine not allowing nails to move up.
Empty magazine, does follower move to top of magazine. Push gun against work piece, does fan motor start? Yes - jam in magazine or lock out bar not operating. (this would allow nail un to fire when out of nails)
2. Piston/driver not returning fully after firing, hence driver blade on top of next nail instead of behind it. This could again be caused by a jammed nail or just a nail head. Another case of not returning is the combustion chamber not making a good seal, check O rings on framer (they are steel rings on bradders) it may just need a good clean it is surprising how dirty they can get and if not cleaned a build up of dirt could break a seal. If not been cleaned for a long time worth checking piston rings, worst case scenario dirt builds up around the rings and stick fully in requiring new piston if the rings will not come out.
Nail guns work on the principle that an explosion pushes the piston driver forcing a nail into the work piece, after the explosion a vacuum is created and it is this that 'sucks' the piston/driver back up the cylinder.

make sure that the nails are loaded in straight and packed down tight

make sure nails are loaded into the gun straight and correctly

Assuming that the gun will not jam with nails removed and the driver returns to top of cylinder when fired without nails. If the driver is bent the nailer will jam without nails. Jamming is usualy caused by bent driver, driver tip worn (not square), or wrong nails. If the driver is not bent and the tip is square, suspect wrong nails. Easy test. Place a strip of nails on outside of rails with the nail heads aligned with top of rail. Move the strip of nails toward the nose if gun. With the heads aligned with the top of the rail, the first nail should align with the path of the driver. If the first nail does not align with the path of the driver and the head is angled slightly away from the path of the driver, the driver may strike the shaft of the first nail pushing the nails back into the rails. If the head of the first nail is forward with the nail shaft angled back away, the nail will flip causing jam. The first nail should align with the path of the driver to prevent jam. It is difficult to find perfectly made nails that align correctly. But certainly check the nails with test mentioned above with every new box for accuracy. You might find that you will need to change brands to get a good fit. Good luck.

If no air is leaking from gun, miss-fire is usually caused by worn or too tight piston oring or lack of lubrication. Easy test. Disconnect airline, remove nails, point nose of gun up then down. Driver should stay in uppermost position. If driver moves up then down within gun replace piston oring and retest. Set pressure to about 100psi. Good luck with repair.

Remove nails and use thin tool to push driver all the way up to top of cylinder. If the gun fires one nail then skips, the driver is not returning to top of cylinder. If no nails fire, then nails are not feeding into proper position. Driver must return to top to allow nails to feed into position. Most common problems are bent driver, worn piston oring and bad batch of nails(head too large). Good luck

Hello. I can help you. The nail gun you have uses 18 gauge brads. I would use only original Bostitch 18 gauge.

The one MM of difference you mention is the reason why you do not have the pressure you did have. Get rid of those 31MM brads and get the 18 gauge. Home Depot carries the Bostitch line. I would go there or to homedepot.com

firing pin called the driver is probably broken or needs new seals max air pressure 125 psi senco sells repair kits

Professional-grade varieties are automatic, and fire a nail directly upon pulling the trigger. A semi-automatic nail gun is more appropriate for beginners, since it requires a two step process: pull the trigger and then tap the barrel against the wood. This safety feature protects the user from accidentally firing a nail gun and injuring himself or others.

Professional-grade varieties are automatic, and fire a nail directly upon pulling the trigger. A semi-automatic nail gun is more appropriate for beginners, since it requires a two step process: pull the trigger and then tap the barrel against the wood. This safety feature protects the user from accidentally firing a nail gun and injuring himself or others.