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H7665 21° Round Head Framing Nailer
-11-
Replacing
Pistons/O-Rings
If you use your nailer 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.
The piston repair kit part number for the
Model H7665 is #PH7665095. For your
convenience, refer to the parts breakdown
during this procedure to identify parts and
their locations inside the nailer.
4. The top of the piston should now be
visible inside the cylinder, which is
housed in the head of the nailer.
5. Open the nose cover as if to clear a
jammed nail.
6. 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.
7. With a long flathead screwdriver or
similarly shaped tool, push the piston
shaft back inside the nailer 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.)
8. Place a new O-ring on the new piston
and apply a thin film of the nailer lubri-
cating oil on the O-ring.
9. 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.
10. After the piston is inserted correctly,
close the magazine. Replace the rear
cap assembly and tighten the 4 cap
screws.
11. 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.
To replace a piston and O-ring(s):
1. DISCONNECT NAILER FROM THE
AIR SUPPLY!
2. Remove all nails from the magazine
cartridge.
3. Remove the four cap screws on the
head of the nailer, near the exhaust
port, and remove the cylinder cover.
Always disconnect air from nailer
whenever servicing! During mainte-
nance, a nailer connected to air may
fire accidentally, causing serious
personal injury!