Grizzly H6144 - Manual (Page 13)

H6144 34° Angle Finish Nailer–2½" -12 -
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.
Always disconnect air from nailer
whenever servicing! During mainte-
nance, a nailer connected to air may
fire accidentally, causing serious
personal injury!
To replace a piston:
1. DISCONNECT NAILER FROM THE
AIR SUPPLY!
2. Remove all nails from the magazine.
3. Remove the four cap screws on the
top of the nailer, near the exhaust
port.
4. Remove the top cap.
5. The top of the piston should now be
visible inside the cylinder, which is
housed in the head of the nailer.
6. Open the magazine.
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 sim-
ilarly 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 pushing the pis-
ton shaft with the screwdriver.)
9. Place a new O-ring on the new piston
and apply a thin film of the nailer lubri-
cating oil on the O-ring.
10. Insert the new piston in the cylinder.
Make sure that the grooves on the pis-
ton shaft line up with those on the guide
at the bottom of the cylinder. The new
piston should easily slide into the cyl-
inder.
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. Replace the top
cap assembly and tighten the four cap
screws.
12. For more assistance, or to install a
complete O-ring set, refer to Parts
Breakdown,
Page 14.
7. The jammed nail should now be vis-
ible; remove it from the discharge area
with needle nose pliers.
8. Replace the driver guide cover and
snap the quick release latch back into
operating position.