Model H8234 28° Framing Nailer
-12
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replacing pistons/o-
rings
Under heavy use, a piston, piston shaft,
or O-ring may wear out. Replacement
is quick and easy. Contact Grizzly
Customer Service at (800) 523-4777 to
obtain the Piston Repair Kit (Part Number
PH8234092), or the complete O-Ring
Repair Kit (Part Number PH8234093).
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. Taking care not to scratch or dent the
nailer parts, use a wooden dowel or
similarly shaped tool to push the piston
shaft back inside the nailer until you
can grip the piston head and remove
it from the cylinder. Clean and inspect
the parts for cracks, wear, or burrs.
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 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.
10. After the piston is inserted correctly,
close the magazine. Replace the rear
cap assembly and tighten the 4 cap
screws.
note:
For more assistance, or to install
a complete O-ring set, refer to the
appropriate breakdown diagram in the
back of this manual for component
locations.
to replace a piston:
1. DISCONNeCT NAILeR FROM THe
AIR SUPPLY!
2. Remove all nails from the magazine
cartridge, and clean the exterior of the
nailer.
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 per-
sonal injury!
