Bostich framing nailer leaks air out driver hole

n80 coil nailer is a very powerful nailer used for hard wood. If the driver is setting nails too deep, adjust safety foot to the lowest level. Install safety foot no-mar boot to lift the gun even higher. If still too deep, most likely the lower bumper inside the gun is worn-out or cracked. Easy test. Remove nails and connect air supply. With trigger depressed, push and hold the gun against work (I use an old rubber hose tightly coiled up). This will fire the gun but keep the driver down allowing you to examine the tip of the driver. The driver should extend out past the nose less than quarter inch. If the driver is extending too far, most likely bumper is worn out. If a large quantity of air is leaking out the nose of gun during the test, indication that lower bumper is cracked. Good luck.

you need an o- ring kit from bostich

check to make sure that there is not a nail jam , if the driver will not retract then the gun will not cycle . if no nail jam then replace the inner trigger

Don't know if this will help you but here goes. I have a Bostich nailer and had to replace the check valve under the trigger.(at least it acts like a check valve, stops air loss when disconnecting gun from hose) It was leaking badly and had to remove trigger to replace the kit. You can do it yourself like I did or take it in to a shop. I carefully punched out the roll pins, replaced the kit after greasing the o-rings with lubricant that was supplied with kit and replaced the trigger.
Good luck

seems like the piston is sticking. put 10 drops of oil in air inlet, and fire gun, try to work it loose.few drops of oil on head moving parts too will help.

If the gun is blowing air out the back cap it needs an overhaul. If you take it to a service center they will be able to supply you with the proper O-Rings or if you pay a little more they will overhaul it for you.

Where does the air leak out from? If it leaks from the trigger DeWalt makes a trigger valve assembly part # 641006-00 list 8.89 BUT if it leaks from other areas we have to look into it deeper. If it is just the trigger valve let me know and I will give you instructions how to remove and install the new one.

Sorry about the delayed response. This unit needs to have the O-rings replaced. The return of the firing pin is not happening correctly. This means that the pressure release holes are still engaged. When the pin pushes out the nail, the return should cause the holes to get covered. If there is an air leak, the return will not complete resulting in an even larger air leak which is what you are now seeing. This is a relatively simple repair for any shop that handles these and would be considered a standard maintenance effort. These are decent tools and with proper maintenance will last for years. Mine is over 22years old and going string.

Dan

The o-rings need to be replaced and/or the trigger assembly is defective. Look around at local lumber yards for a "Bostich days" promotion. Often with the purchase of a box of nails, the Bostich rep will "service" up to 2 guns for free. If this is not an option for you because of time, you can purchase the o-ring kit and replace the rings yourself. This is not a difficult repair. Also, be sure to lubricate the guns with pneumatic oil frequently as this will keep the rings lubtricated and prevent them from drying out and leaking.

Hope this helps,

Dan

18 guage nailer has a very thin driver and plastic cylinder which bends or breaks easily. Remove the head noting all the parts in the head and remove the piston which should be at the top of the cylinder. Check for broken or bent shaft. Most likely broken and jammed in cylinder. Parts are not expensive. Check WWW.toolpartsdirect.com for diagram and parts