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Replacing Pistons/O-
Rings
If you use your stapler day in and day
out, repair pistons are cheap insurance
against wasted down time and lost profits,
in the event that a piston or piston shaft
becomes worn out. A replacement piston
and O-ring kit, part PH7678075, may be
purchased for the Model H7678.
Always disconnect air from stapler
whenever servicing! During main-
tenance, a stapler connected to air
may fire accidentally, causing seri-
ous personal injury!
To replace a piston:
1. DISCONNECT STAPLER FROM THE
AIR SUPPLY!
2. Remove all staples from the magazine
cartridge.
3. Remove the four cap screws on the
head of the stapler, near the exhaust
port.
4. Remove the cap.
5. The top of the piston should now be
visible inside the cylinder, which is
housed in the head of the stapler.
H7678 18 Gauge Deep Stapler Kit
6. Open the nose cover as if to clear a
jammed staple.
7. Watch the discharge area and push
the top of the piston with your finger.
You will see the piston shaft slide
down the discharge area.
8. With a long flathead screwdriver or
similarly shaped tool, push the piston
shaft back inside the stapler until you
can grip the piston head and remove
it from the cylinder. (Be careful not to
scratch the discharge area when push-
ing the piston shaft with the screw-
driver.)
9. Place a new O-ring on the new piston
and apply a thin film of the stapler
lubricating oil on the O-ring.
10. Insert the new piston in the cylinder.
Make sure that the grooves on the
piston shaft line up with those on the
guide at the bottom of the cylinder.
The new piston should easily slide
into the cylinder. DO NOT force the
piston into the cylinder! If the piston
is not easily inserted, double-check the
alignment of the piston shaft with the
grooves on the guide.
11. After the piston is inserted correctly,
close the magazine pusher. Replace
the rear cap assembly and tighten the
4 cap screws.
12. For more assistance, or to install a
complete O-ring set, refer to the appro-
priate breakdown diagram in the back
of this manual for component loca-
tions.
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