Nailer: Won't Fire
If your nailer won't fire, look for signs of damage on the following parts: the piston head valve, o-rings, seals, driver, bumper, trigger valve, and piston valve. Now that you know the part you will need to fix, read on for information on how to repair your nailer as efficiently as possible. Refer to your owner's manual for detailed instructions on your model.
To examine the condition of your O rings remove the top cap off from the nail gun, the magazine and the bottom nose piece. Pull the cylinder out of the nail gun, you may have to tap on the body with a rubber mallet to free it. Remove the piston/driver assembly from the cylinder. Remove...
To examine the condition of your O rings remove the top cap off from the nail gun, the magazine and the bottom nose piece. Pull the cylinder out of the nail gun, you may have to tap on the body with a rubber mallet to free it. Remove the piston/driver assembly from the cylinder. Remove the metal ring from the housing that supports the cylinder inside the gun. Examine the O rings around the outside of the cylinder, and the metal ring that supports the cylinder for tears, rips, and signs of deterioration.
Replace any damaged O rings (or all the O rings if you are rebuilding it). Remove them by placing a small screw driver under them and lifting up and walking them off. Install the new O rings and apply a little grease or Vaseline to the O ring. Remove the piston head valve from inside the top cap and inspect and replace and damaged O rings. (On some models it separates into 2 pieces. Separate the inside portion of the valve from the outside portion by pulling them apart. Examine the O rings located on the outside and the one on the inside. Replace these O rings. Reassemble the valve).
Reinstall into the head. Install the piston/driver assembly back into the cylinder. Slide the metal ring over the cylinder assembly. Make sure the piston is all the way down in the cylinder for easier installation into the housing. Install the cylinder assembly into the housing. Make sure the driver is aligned properly to the opening in the housing and press the assembly into place. Install the top cap with a new gasket, magazine and the bottom nose piece with a new gasket and tighten the bolts a little at a time in an alternating pattern to seat the gaskets properly on the top cap and bottom nose piece.