Nailer: Double Fires

There are different types of nail guns for doing different kinds of jobs. Depending on what the nail gun is designed to do will require different air pressure settings. Check your owner’s manual for the recommended air pressure and adjust accordingly. Make sure your air compressor can keep up. If it is falling behind, wait until it fills back up or purchase a more powerful air compressor.

When you pull the trigger it releases air driving the piston/driver assembly down on the nail. 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. (On some models it might be easier to make this repair by removing the magazine first). To replace the trigger valve remove the grommet on the side and drive the roll pin out and remove the trigger. Some nail guns have the valve threaded into the housing while others are held in place by roll pins. Use a wrench to remove the valve or tap the roll pins out depending on your model and remove the valve. Clean any debris out of the valve housing. Apply a very tiny amount of Vaseline to the O rings on the new valve. Install a new trigger valve and reassemble. Reattach the magazine.

There are different types of nail guns for doing different kinds of jobs. Depending on what the nail gun is designed to do will require different air pressure settings. Check your owner’s manual for the recommended air pressure and adjust accordingly. Make sure your air compressor can keep up. If it is falling behind, wait till it fills back up or purchase a more powerful air compressor.