Feed plunger of the NV45ab moves toward piston shaft when air supply is attached but won't advance nails after the first one is fired. Have replaced the o-rings. What is the purpose of the two allen set screws located in the exhaust cover. Will they affect pressure to the gun. Don't want to touch them until I know their purpose.
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Re: 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.
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Go to Dewaltservicenet.com and download a breakdown of the tool before starting. I would recoment changing all the O rings and make sure that you get a good grease to lube them first. Its not that hard.
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The Bostitch rn46 is a very good nailer however suffers from the problem that you are experiencing. Easy to fix. Remove the nails and connect to air pressure (100psi). With side door open and trigger depressed, cycle the gun against old coiled rubber hose or soft wood. As you cycle the gun, check that the feeder is moving back and forward with speed and the driver is moving down then up again. If the feeder seems to move in slow motion back and forth the air passage that feeds air to the feed piston is restricted or oring/spring to feed piston is worn. If the feeder moves very fast then suspect worn driver oring. To check driver oring, remove nails and air supply and leave open side door. Point nose of gun up then down to see if the driver seems loose and is moving up and down the cylinder. When the driver oring is good, the driver will stay at the top of the cylinder. If the driver oring seems ok and the feeder moves very fast then suspect feeder spring weak or missing. I usually find that debris from lower bumper and driver piston oring shavings have entered/clogged the air passage to feed piston. Replace parts as needed. Good luck.
The feeder piston should be very hard to retract by hand and should move back and forth as quickly as driver piston moves. With nails removed and side door open, activate gun on rubber surface (old coiled up air hose or water hose ) and make sure driver and feeder move quickly. If not check for debris within feed piston or air passage to feedpiston. The spring straddles the feeder with the slightly bent part of the spring arms contacting the upper surface of the feeder (little grooves cut into feeder). When installed correctly, the tip of the spring arms will be pointing upwards and the back part of the spring between the two loops will be contacting the feeder shaft. Good luck.
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.
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.
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.
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.
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.
you have one of a couple problems. First the piston is not moving freely to advance the nails, the magazine might not be set for the nails being used, or the collation is not correct, or the feed pawl spring is broken, and the driver might not be retracting fully to allow the next nail to feed. What I would do is remove all the nails, and get a block of wood and open the door that holds the nails in place and look for free movement on the feed pistion and how the driver is functioning. If all appears OK unplug the air and check the spring on the feed pawl, also check to make sure not gummed up from asphalt, If the feed piston is not snapping it could be an oring or debris in the air hole feeding into it. Let me know if you need more assistance.
The feed pawl is moved by a piston that extends from a cylinder on the lower side of the guide body. There are a couple seals inside the cylinder that if damaged will not hold enough air to activate the piston and advance the next nail. The two seals are Senco part number LB0828 & LB0845. Better yet get a Senco YK0369 repair kit and replace all of your o-rings, you'll have a like new gun for around $60.
could be a few problems, are you using the right nails with the proper collation. is the magazine set correctly for the nail size, is the piston retracting fully to advance the next nail, and is the feed pawl spring broken and or is the feed pawl moving freely, to check the last one remove all nails and open the door that would guide the nails and fire the tool and look at the feed mechanism to make sure working properly, sometimes the bumper starts to disintegrate and pieces get stuck in the air hole controlling the feed. Let me know if you need more clarification or help