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H7947/H7948 16 Gauge Stapler
-12-
Replacing
Pistons/O-Rings
If you need to replace piston parts in your
stapler, you can purchase a piston repair
kit from Grizzly: call 1-800-523-4777.
The Piston Repair Kit part number for
Model H7947 is PH7947081; the Piston
Repair Kit part number for Model H7948
is PH7948081.
Refer to the parts breakdown during this
procedure to identify parts and their loca-
tions inside the stapler.
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 stapler.
5. Open the nose cover of the stapler to
reveal the piston driver.
6. Use a narrow, flathead screwdriver to
push the piston driver up until the pis-
ton head clears the top of the cylinder.
(Be careful not to scratch the discharge
area, the driver set plate or the piston
cylinder.)
7. Grip the piston head by hand and
remove the piston assembly from the
cylinder.
8. Clean all metal parts with an automotive
grade solvent. Clear all ports and blow
the solvent away with compressed air.
9. Replace any part that shows damage
or heavy wear. Relubricate the tool.
10. Apply a thin film of the stapler lubricat-
ing oil on the new O-ring and place it on
the new piston. Install any other parts
included in the piston repair kit.
11. 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 O-ring and make sure the
cylinder is clean.
12. Make sure that the cap gasket is in
place, then secure the cap to the sta-
pler body by tightening the four cap
screws.
To replace a piston and O-ring(s):
1. DISCONNECT STAPLER FROM THE
AIR SUPPLY!
2. Remove all staples from the maga-
zine.
3. Remove the four screws that secure
the stapler cap and remove the cylinder
cap.
Always disconnect the air supply
from the stapler whenever servicing!
During maintenance, a stapler con-
nected to air may fire accidentally,
causing serious personal injury!