I JUST STARTED A DECK PROJECT AFTER NOT USING MY NAILER FOR A FEW MONTHS. IT STARTED LEAKING AIR THROUGH THE TRIGGER AREA AND DI NOT FUNCTION. THE LAST TIME I USED IT - IT FUNCTIONED WELL. HOW DO I FIX IT AND WHERE DO I GET THE PARTS. THANKS, ED
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Re: BOSTITCH NAILER - LEAK THROUGH TRIGGER
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Do you see an oil port or small hole in and around the trigger?
The trigger that you use to actuate the gun operates a plunger diverting air from a the storage chamber into the barrel. This plunger usually has a least one and usually two o-rings. If there is an oil port or small hole on the body above the trigger and either forward or to the rear of the trigger, this may lubricate the plunger enough to revitalize the o-rings and create air from the storage chamber escaping at the trigger.
O-rings do shrink in a drier climate should you be in one. They also shrink over time. Lastly, you may have one with a tear in it and this could also cause the leak.
As I seem to recall Bostitch is one of those companies that encourages their equipment be returned to a factory service center. And air guns being somewhat dangerous this would normally be the case.
Can you supply the model version and perhaps I can also provide you with a parts explosion that will show you the elements to access should you desire to undertake the replacement of the o-rings yourself.
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Air leaking from trigger when attempting to fire the gun is normal and should cause nailer to fire, however if the trigger pin is not depressed all the way in,the gun may not respond. Easy test. Remove the nails and remove the trigger. Connect the gun to air and quickly depress the valve pin all the way in with finger. If the gun fires, adjust the safety foot so that the trigger pin is depressed all the way in. If the gun still does not fire, then remove the head cap and pull out the headvalve. Apply plenty of white grease to orings and retest. If the gun fires, then replace the headvalve orings. When the headvalve orings are worn, air will leak from bulkhead chamber to the headvalve chamber causing the gun to not respond to the trigger. The addition of grease to worn orings will make them temporarily seal. Good luck
Usually, if you change the trigger valve (TVA11) the nailer will function as before. This problem could be also be caused by air leaking past the orings in the headvalve (3 orings). Easy to check. Remove the head and pull out the headvalve (white plastic piston). Look carefully at the cylinder where headvalve orings make contact and look for smooth surface. If scratched or deep groove, replace head or try to smooth out with fine sandpaper. You can make the orings fit more snuggly against the cylinder by using one or two turns of Teflon tape under the oring (just the outside orings). Apply white grease and replace head to test. As for the trigger valve, remove the trigger to expose the valve. Check if the trigger pin moves from side to side or seems loose. If it seems loose replace the valve. If the valve has a metal pin (many have plastic (metal better)), you can pop out the valve and just replace the orings on the inner plunger. If plastic pin replace the valve. To remove the valve, remove the roll pins in the body of the gun (3mm) and apply air pressure to the gun. Use lower pressure than normal and use a glove or bunched up shop rag to catch the valve as it is pushed out by the air. Could come out with force depending on the pressure. Note the slots on the valve as they relate to the roll pins so you can reinstall correctly. Good luck.
Your nailer uses a trigger valve (could be part # tva6 cost about $20, need to look up) and is sold at www.bostitch.com or generic valves sold on ebay . If you have a source for orings, you could try to repair the valve. Remove the roll pin that holds the trigger to expose the tva6 valve. There are roll pin/pins that hold the valve in just above the valve in the body. Remove these pins and apply air pressure to gun to pop-out the valve. Use caution when you do this. Remove nails, lower pressure to gun and use glove or rag to catch valve because it could come out with force. With tva6 valve in hand remove two pins that hold valve together and remove inner plunger. The middle oring on plunger is cause of leak. Try using an oring about same size as the broken seat. It must fit pretty tight to work. If you had a small leak it could be that the firing pin orings fit too loose or just too worn. Use silicone lube or oring lube on the orings and the valve port. Good Luck on your repair and email if you have other questions
The air leak can be one of a few things. FIrst make sure that you have added some pneumatic oil to the air stream. This will lubricate the o-rings and make a tight seal. If that fails to resolve it, repalce the o-rings. (kits available for around $20). Next, woul dbe the trigger assembly itself. These triggers wear over time and are easily replaced.
See the website below for parts and a good diagram of the construction of the gun. You should be able to replace the parts by following the diagrams.
This is an indication of a defective seal. Try adding a little pneumatic oil to the gun and triggering it a few times. Sometimes all it is is a small leak in the o-ring because of a lack of lubrication. If not, then try replacing the o-rings (kit available for around $20). The next possibility is the trigger itself. I have replaced the trigger assembly on mine once thus far.
If the air is coming out the trigger it must be replaced. Depending on the model of gun you will have to replace the trigger assembly or various o-Rings. Find a Bostitch dealer in your area and they will supply the parts you require.