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 H7949 is PH7949103; the Piston Repair Kit part number for Model H7950 is PH7950103; the Piston Repair Kit part number for Model H7951 is PH7951104.
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 and remove the cylinder cap.
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. With the magazine cover open, gently push the piston down to make sure the piston driver moves freely into the driv- ing hole.
Note: DO NOT force the piston into the cylinder! If the piston 'hangs' in the cylinder, double check the fit between piston and
11.Make sure that the cap gasket is in place, then secure the cap to the nailer body by tightening the 4 cap screws.
H7949/H7950/H7951 Nailer |