Model W1777 2
1
⁄
2
" 16 Gauge Finish Nailer
-11-
Replacing Pistons/
O-Rings
Always disconnect nailer from air
whenever servicing! During main-
tenance, a nailer connected to air
may fire accidentally, causing seri-
ous personal injury!
Under heavy use, a piston or piston shaft
may wear out. Replacement is quick
and easy. Contact your authorized Shop
Fox dealer to obtain the Piston Repair
Kit (Part Number X1777095), or the
complete O-Ring Repair Kit (Part Number
X1777096).
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.
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
inspect the parts for cracks, wear, or
burrs.
9.
Place a new O-ring on the new piston
and apply a thin film of the nailer
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. Replace the rear
cap assembly and tighten the four
cap screws.
12.
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, do these steps:
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.
