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Nails won't advance - Porter Cable Coil Roofing Nailer

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My hitachi nail gun NV 50AA will fire, but won't advance the nails on a regular basis


NV50 nailer is very difficult to repair due to complicated feeder /feeder spring / feeder retainer pin design. You most likely need to replace the orings on the feeder piston. Problem is that you must remove the feed pin/ spring to get the piston out. If you are going to attempt to replace the orings, study how the pin is installed otherwise you will make it worse. Order new springs (2 different springs ) and install them when you are going back together. Good luck

Mar 03, 2013 | Tools & Hardware - Others

1 Answer

Why won't feed plunger advance nails?


The two hex head screws on the very top of the head hold the air deflector and attach to the headvalve (the part inside the head with rubber coating, this headvalve has a gasket under that should be check for proper alignment ). Other small screws that look like set screw are only plugs that are removed to install auto control hoses in factory work. These are only plugs so just put them in a few turns with locktite.

Jan 23, 2013 | Hitachi Tools & Hardware - Others

2 Answers

Nv45ab won't advance nails


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.

Jan 22, 2013 | Hitachi Air Tools & Compressors

1 Answer

Hitachi NV45AB won't advance nails


This problem could be caused by the head gasket fliped the wrong way not sealing small hole in the body. Also the head valve gasket (small round gasket between headvalve and head) could be place with vent hole mis-aligned. Check these two items and post again.

Jan 22, 2013 | Air Tools & Compressors

1 Answer

The gun won't work right


As a safety precaution, nailers have incorporated a safety foot that will prevent the gun from firing unless you push down hard. Some guns also have a system where the gun will not fire at all if there are no nails in the gun. To dry fire this type of gun you must pull back the pusher or open the side door. If nails do not feed properly, check for wrong nails, bent rails or weak pusher spring. If all is good with rails and pusher, suspect that the driver/piston is not at top of cylinder and lower part of driver blade is preventing nails from advancing. Remove airline and push the driver to top and retest. If driver is slipping down the cylinder under its own weight, replace oring. Good luck

Nov 10, 2012 | Tools & Hardware - Others

2 Answers

I have a porter cable roofing nailer model # RN175 that does not advance the nails everytime what causes this?


Some causes, in order of probability:
Roofing nailers get a lot of tar build up on them, especially around the nose safety and nail feed pawl area. Cleaning off this buildup will usually take care of most problems with roofing nailers.
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.
If the driver doesn't retract fully, the next nail won't be able to advance properly for the next shot. This can be caused by o-rings in the head that are worn or out of their proper place.

Oct 06, 2012 | Air Tools & Compressors

2 Answers

Bostitch N80SB won't reset after firing


Most likely just needs piston oring. Remove nails from the gun and point nose of gun up then down again. If the piston travels up and down in the cylinder, replace the oring. The piston returns to top with air pressure and needs good snug piston oring and good lower bumper (if bumper is cracked or missing pieces ~ replace ). Be sure to lube the orings in the headvalve with silicone paste or white grease. Part # ORK11 oring kit will reseal the gun. Good luck with your repair.

Jun 02, 2012 | Stanley Air Tools & Compressors

1 Answer

My Bostitch N12 won't advance nails


It could be the o-rings for the feed piston but a bad feed spring will also cause problems. that would be the easiest place to try if you can find a spring. Many of the parts for these are becoming NLA (no longer available) from Bostitch. One problem they had in the feed piston area was chipping the nose where the orign seals the piston stem. There is a small bumper on the inside of the feed piston cap that goes bad and allows the piston to travel to far back which slams the feeder against the lower housing and can chip it where the piston goes through.

May 16, 2012 | Stanley Air Tools & Compressors

1 Answer

Bostitch RN46-1 roof nailer won't advance nails into the piston chamber. After loading the nail coil, the first nail fires fine, but the next won't advance. Please help. Thanks!


check the height of the magazine, but I think that you have a problem with the feed piston or there is a spring on the feed pawl that might be broke. Unload the nails and dry fire the tool with the door open observing the piston movement. It should "SNAP" back and forth if it does unplug the air and check to see if the spring that applies pressure to the pawl is broken or missing. I am going to guess the piston. If this tool has not been serviced in a while the asphalt tends to jam up the mechanisms. Let me know if you need more assistance.

Jun 12, 2011 | Tools & Hardware - Others

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