How to Repair a Nail Gun Trigger
A nail gun is a workhorse in any wood shop. An air powered nail gun will accurately and efficiently place nails in a fraction of the time of an old fashioned hammer, and if a nail gun stops working, the impact is frustrating and time consuming. If the trigger is broken on a nail gun, there are a number of options to evaluate in order to fix the problem. The most critical element to a successful repair to your nail gun is to have the original owners manual so that you have an accurate schematic for repair. If you do not have one, get one before you attempt to repair the gun.
Step 1 - Disassemble Gun
Remove any nail strips or cartridges from the nail gun. Make sure that there are none in the gun at all. Make sure that the nail gun is disconnected from any power or air compressor supply. Place the nail gun on a sturdy surface and remove the casing using the screwdrivers to remove the screws. Keep careful track of the screws and components as you remove them, if one is lost or misplaced, it will not be easily substituted.
Step 2 - Inspect the Gun
Inspect the trigger mechanism for obvious broken parts. If there is air leaking around the trigger, it is most likely due to a broken or cracked "O" ring. You will need to order replacement parts from the manufacturer for your specific model. There are a wide variety of nail guns on the market, and various offerings even from the same manufacturer, so the parts will need to be exact.
Step 3 - Replace Parts
Replace any broken parts once you have secured the correct replacement part from the manufacturer or local dealer. Often this will take a good amount of care and finesse, as they are small parts and the placement is critical for proper operation of the nail gun.
Step 4 - Reassemble Gun
This is a good time to do any cleanup that needs to be done on the inner workings of the gun. Inspect for large amounts of dirt or debris, and wipe these away or use canned air to blow it away. Inspect for loose wires or components and re-tighten them. Once this is done, reassemble the gun in the reverse order in which it was disassembled. Make sure all casings are secure and tight. Make sure that you do not have any spare parts, and if you do, go back and find where they belong.
Step 5 - Test the Gun
Once the nail gun is fully reassembled, reconnect it to it's power supply and air supply. Try to test fire the gun, without loading the gun with any nails to make sure the trigger is working correctly. If the gun seems to be working properly, load it with nails and do a test fire with nails to make sure it is working as it should.