Damaged Driver, Rings and RE-ASSEMBLY

IX. MAINTENANCE

B. DAMAGED DRIVER

To remove the driver:

1.Disconnect gun from the air supply and remove any fasteners from the maga- zine.

2.Loosen the 4 cap screws securing the gun cap to the gun body sequentially.

3.Remove the four cap screws and the gun cap and place them to one side.

4.With your fingers, reach into the air cylin- der, grasp the main piston, and pull out the driver.

5.Inspect driver condition and repair or replace as necessary. Replacement dri- vers are sold pre-attached to the main piston and are referred to as the “com- plete driver unit”.

Air Cylinder

Gun Cap

Cap Screws

Driver

Main Piston

Figure 11 shows the gun partially disassembled to

repair or replace the driver.

NOTE: Before putting the gun back together,

read through Section IX.C.

C. O-RINGS AND RE-ASSEMBLY

Since the gun is disassembled, inspect the condition of the visible O-rings. If the O-rings show signs of wear and tear, they should be replaced. Inspect the surfaces where the O- rings seal for any possible rough spots which will erode the new O-rings. When replacing the O-rings, make sure that there is no dirt or grit in the groove where the O-rings seat. Do not stretch the O-rings or nick them on any sharp edges or burrs. If cleaning parts with a solvent, do not use a solvent that may deteri- orate the O-rings.

To re-assemble the gun:

1.Before replacing O-rings, lubricate them with a light grease that is non corrosive to rubber.

2.IMPORTANT: Carefully position the dri- ver tip into the plastic driver insert from the top of the nail gun. You may have to wiggle the driver so the main piston seats into the cylinder. The driver has a T- shaped cross section and will only fit one way. If the driver is not seating, do not force it. Remove the driver unit, rotate 180°, and try to reinstall it.

3.Replace the cap on top of the gun. Tighten the cap screws sequentially. If the cap screws are not tightened even- ly, the cap will not seat correctly, air will leak, and the gun will not function. Ensure that the washers are installed under the cap screw heads.

4.Re-check all bolts to make sure they are tight and test the gun to ensure that it works properly. See the following para- graph.

- 10 - Grizzly Imports, Inc. G3690