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H5527 18 Gauge Brad Nailer
-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.
6. Open the nose cover as if to clear a
jammed nail.
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 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.
To replace a piston:
1. DISCONNECT NAILER FROM THE
AIR SUPPLY!
2. Remove all nails from the magazine
cartridge.
3. Remove the four cap screws on the
back of the nailer, 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 nailer.
Always disconnect air from nailer
whenever servicing! During mainte-
nance, a nailer connected to air may
fire accidentally, causing serious
personal injury!