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12. Check the bearing (T, see Fig. 3) in the air motor
base for wear. If wear is excessive, replace the
base (61).
13. To inspect the trip rod (63), unscrew the piston rod
(42) from the tube of the piston (64). Use a wrench
on the turned down end (R) of the tube. Remove
the trip rod, being careful not to damage the pol-
ished surface of the tube. Refer to Fig. 7. Inspect
the trip rod carefully; if the spring is broken or the
rod is damaged, replace the rod. Be sure to check
the spring guides for deformed edges or cracks.
Do not attempt to repair the rod or adjust the
spring.
CAUTION
Handle the trip rod assembly (63) carefully.
Scratches or nicks will cause early spring failure.
Lubricate with light
waterproof grease.
Apply Loctite 242 or
equivalent and torque
to 200–220 N.m
(147–162 ft–lb).
Check spring guides
for deformed edges or
cracks.
Fig. 7
Service
Reassembly
1. When replacing the trip rod assembly (63), lubri-
2. Pack light, waterproof grease into the wiper cavity
3. Place the cylinder (27) upside down on a flat sur-
4. Align the notches in the gasket (44) with the chan-
64
5. Install the lockwashers (65) and screws (14) in the
6. Grease the backup washer (74) and v-packing
R
63
7. Install the trip rod bushing (45), air valve housing
42
cate the spring and rod with light waterproof
grease. See Fig. 7. Clean the threads of the piston
tube (64), then slide the trip rod into the tube. Ap-
ply Loctite 242 or equivalent to the threads of the
piston rod (42) and screw it into the piston tube.
Torque to 200–220 N.m (147–162 ft–lb).
and the throat cavity. Install the wiper (16*). Thor-
oughly lubricate the new packing. Carefully tuck a
new backup (37) and v-packing (33*) into the
throat cavity. The lips of the v-packing must face
up toward the piston. See Fig. 3.
face. Grease the inside walls of the cylinder, the
piston (64), and the piston o-ring (17*). Install the
o-ring on the piston; the o-ring is larger than the
piston groove. Push the piston into the cylinder so
the excess of the o-ring fits into one of the chan-
nels in the cylinder. Use your fingers to push the
excess o-ring into the groove, and push the piston
further into the cylinder.
nels in the cylinder (27). Install the cylinder and
piston (64) into the base (61). See Fig. 5.
base (61) and torque to 34 N.m (25 ft–lb). Place
the gasket (48*) on the cylinder (27). See Fig. 5.
(32). Install the backup washer in the trip rod bear-
ing (5), then insert the v-packing with the lips fac-
ing down, out of the bearing. Install the gasket (75)
on the bearing. Carefully thread the bearing down
over the trip rod (63) and screw it into the cylinder
(27), using a 1 in. deep well socket wrench. Place
the bumper (73) in the recess at the top of the cyl-
inder, with the ribs facing up. See Fig. 5.
(23), lockwasher (10), and nut (46) on the trip rod
(63). Hold the trip rod up with padded pliers. Adjust
the housing and nut until 1 mm (0.039 in.) of the
trip rod projects. Torque the nut to 28–34 N.m
(21–25 ft–lb). See Fig. 8.
CAUTION
Take special care to avoid damaging the plated
surface of the trip rod (63), which would restrict its
free movement. Special padded pliers, Part No.
207–579, is available. See Accessories.
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