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if you mean it only shoots air when you pull trigger and not a nail , disconect from air supply and open side of nail mag. (two screws on side) look for forign object in front towards head end , sometimes the paper that nails are wrapped in gets stuck in there , also there is a small spring metal clip at front of mag is this broken off and is unusually short ?
This is a bottom fire tool. (NV83A2) You need to hold the trigger down and then as you place the nailer to the wood the safety will depress and it will fire once. This is usually done in one, swift action. If you do this in the opposite way by placing the tool to the wood and then pulling the trigger they often will double fire.
Trigger lock out is engaged when there are no nails in the gun. Load nails as usual to release. There is a pin just behind and under the door latch. Sometimes this pin will move up into the release catch when the pin oring is missing causing the door not to close properly effecting the lock out. Good luck
Dewalt has two triggers available for their framing nailer. The black trigger (390746-00) is a bump style trigger. While holding the trigger, you will be able to fire a nail by pressing nose against work. This trigger is preferred by most framers because it is much faster. Gray trigger will only allow one nail to be fired. Bumping will not work with the gray trigger. With trigger released, you must place the nose against work then pull trigger to fire. To fire next round, you must release trigger, pull gun off the work, again place nose against work then press trigger. Check dewalt web site for recall information. Some dewalt framers have been recalled for faulty trigger. Good luck with your projects.
I hope this doesn't offend you. What I'm suggesting is that you may not be using your nail gun correctly. Some people keep the trigger pulled and bounce the gun onto the wood. This technique works okay, but placement accuracy of the nail suffers. The other technique is to place the gun on the wood and pull the trigger USING TWO HANDS! This is the technique suggested by the manufacturer. The problem with this technique is that if you apply insufficient pressure to the gun (USING ONE HAND) the safety is not engage so you don't shoot a nail. What usually happens - I just witnessed this a couple of weeks ago - is that not enough pressure is applied while pulling the trigger so you push harder and end up bumping the gun which shoots a nail - because you have the trigger pulled, but the nail shot was a surprise so it causes another bump (and is more apt to bounce because you're using just one hand). Because it is a machine and can operate faster than your reflexes - it shoots another nail. This happens before you can lift it off of the wood, or remove your finger from the trigger. That's the reason I keep the trigger pulled and bounce it. I know that after the bounce I've set a nail, and can remove my finger from the trigger. When I need to accurately set a nail I always use two hands, press hard and pull the trigger, and release quickly. Only pull the trigger when you know you're about to set a nail, and are poised above the workpiece.
On some models the contact fire is not available. There is a flap that is under the actual trigger. When you press the safety in, it engages this little flap which allows the trigger to be engaged. As soon as the safety comes up this little flap falls back down disengaging the trigger.
There is an optional trigger assembly that you can put on this nailer. You need parts 174299 and 174300 to make this gun a contact nailer.
If the nailer is passing air from directly out of the trigger valve, it must be replaced (P/N-TVA11). If it is passing air from anywhere else, (eg back cap or front ) it needs an O-ring kit (P/N- ORK11)
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.