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If the trigger is worn out it can cause the nail gun to double fire. If the gun is set to bump fire and it is double firing in this setting then replace the trigger valve. If the nailer is set to trigger fire, then leaky O rings on the trigger valve can cause this.
I find that the trigger valves in these guns are reliable and that most problems with random fire is lack of lubrication and adjustment of the safety foot. Assuming that air does not leak when you connect air supply and leaks from trigger when attempting to fire. This indicates a lack of lubrication of the head valve. Remove the head valve and lube with white grease.
Test the gun, of ok then you are done. If no joy, then check safety foot for adjustment. How to test if the safety foot is the problem.
Remove the nails, remove the trigger leaving exposed the trigger firing pin. Adjust air supply to 100 psi and connect to gun.
Assuming no leaks quickly depress the trigger valve pin all the way in. If the gun fires then the problem is with the safety foot and or the actual trigger is not pushing the firing pin all the way in when attempting to fire. Make adjustments accordingly. Good luck with your repair.
Some trigger valves (tva6) are sensitive (defective?) however there are some things you can try to change how the gun acts. I have noticed that the brand of oil has an effect on the orings. Some brands will swell the orings, I like Paslode nail gun oil. Do not wash the gun with gasoline or wd40. Use diesel. Change the nail depth setting one position. Lowering the air pressure will make a difference. I find that most operators use too much pressure. A stronger safety spring under the trigger will separate the trigger and firing pin quicker. Finally you could use single fire trigger. Good luck
Most nailers have a two position setting on the trigger to allow for single fire or bump fire. If set on bump fire, the gun will work better when you bump fire the gun instead of placing the gun on the work then depress trigger. Bump fire works best when safety spring has good tension. Easy test. Make sure that the safety spring is in place (with air hose removed, contact foot should spring back quickly when pushed against work). With air connected, hold trigger and quickly bounce the gun against the work. If the gun does not fire when you bump, the trigger is most likely set to single fire. With trigger set to single fire, you must place the gun against the work, then depress trigger. If the gun shoots two nails while set to single fire, most likely worn trigger or worn out trigger valve. These parts are not expensive and are easy to replace. Good luck
If the trigger is set to single fire, you will need to place the gun against the work then pull trigger as you have done. Try setting the trigger to bump fire and try again. If hear a thump inside the gun, remove the head and check that the head valve in not stuck from lack of lubrication. Easy test, remove the nails, remove trigger pin, remove trigger and manually push trigger firing valve. If the gun fires then suspect faulty trigger or safety arm not lifting enought to activate the trigger valve. Good luck
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.
Best practice is to bump fire the gun to prevent double fire. Do not place the gun on the work and pull the trigger. This takes practice while using at an angle. Works better if the nose piece has rather sharp points to help nose to stay in postion while you bump. With trigger depressed, practice without nails bumping/hitting wood at different angles untill you can bump hit at the spot that you need the fastener. If the gun double fires while bump-firing, most likely all the safety/trip parts are worn/loose. Not expensive to replace. Good luck.
New user will jam the gun/ nails because gun was most likely not bump fired. Placing the gun then depressing trigger will usually cause double fire in the hands of new user. New user should practice on scrap lumber bump firing at many angles till they get the idea; or give them a training period with a nailer that has a single shot trigger (they may develop bad habits with single shot however).
Safety foot and lever inside of trigger are not pushing the trigger pin all the way in. To verifty that the gun will fire, remove the nails to allow for dry fire. Remove the trigger to reveal the trigger valve. Hold the gun against old coiled rubber hose or soft wood. Very quickly depress the trigger pin all the way in. If the gun fires, adjust safety foot and trigger so that the trigger pin is fully depressed when your bump fire. If the gun will not fire after adjustment, remove the head and lube headvalve/orings with silicone paste lube.
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