Replacing
Pistons/O-Rings
If you need to replace piston parts in your nailer, you can purchase a piston repair kit from Grizzly: call
The Piston Repair Kit part number for Model H7945 is PH7945090; the Piston Repair Kit part number for Model H7946 is PH7946090; the Piston Repair Kit part number for Model H7995 is H7995090.
Refer to the parts breakdown during this procedure to identify parts and their loca- tions inside the nailer.
Always disconnect the air supply from the nailer whenever servicing! During maintenance, a nailer con- nected to air may fire accidentally, causing serious personal injury!
To replace a piston and O-ring(s):
1.DISCONNECT NAILER FROM THE AIR SUPPLY!
2.Remove all nails from the magazine.
3.Remove the four screws that secure the nailer cap, then remove the cylin- der cap and cylinder seal.
4.Push the top of the piston down with your finger as far as it will go; this will push the piston driver into the nose of the nailer.
5.Insert a stiff rod or wire of the same diameter as your nails into the dis- charge area of the nose and use it to push the piston driver up until the piston head clears the top of the cyl- inder. (Be careful not to scratch the discharge area or the piston cylinder.)
6.Grip the piston head by hand and remove the piston assembly from the cylinder.
7.Clean all metal parts with an auto- motive grade solvent. Clear all ports and blow the solvent away with com- pressed air.
8.Replace any part that shows damage of heavy wear. Relubricate the tool.
9.Apply a thin film of the nailer lubricat- ing oil on the new
10.Insert the new piston in the cylinder. Make sure that the grooves on the piston driver align with those in the set plate at the bottom of the cylinder.
Note: DO NOT force the piston into the cylinder! If the piston is not easily inserted,
12.Put the cylinder seal back on the top rim of the cylinder.
13.Make sure that the cap gasket is in place, then secure the cap to the nailer body by tightening the 4 cap screws.
H7945/H7946/H7995 26° Angle Nailer |