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Maintenance and Repair
wear or damage. Remove the air manifold gaskets
(91). Replace any worn parts.
13. Remove the trip rod nut (106) and the lock washer
(86) from the trip rod (43a). Pull the air valve hous-
ing (102) up off the trip rod.
14. Pull the trip rod and piston assembly (43) up as far
as possible.
15. Grip the trip rod (43a) below the bushing (95) with a
padded pliers, and screw the bushing off the trip
rod.
NOTE: Special care to avoid damaging the plated
surface of the trip rod must be taken. A padded pli-
ers, part number 207579 is available from Graco.
16. Remove the thrust washer (96) and dampening pad
(97) from the air motor cylinder (104).
17. Remove the eight screws (105) and lockwashers
(68) holding the air motor cylinder to the base (46).
18. Carefully pull the air motor cylinder (104) straight
up off the air motor base (46) and trip rod and piston
assembly (43a).
NOTE: Be careful not to tilt the cylinder as this could
damage the smooth inner surface.
19. Check piston o-ring (69) for wear or damage and
replace if necessary. The diameter of the o-ring is
larger than that of the piston. Inspect the cylinder
gasket (103) and replace as necessary.
F
. 4 Torque Key
IG
1 Torque to 25 ft. lbs (34 N.m)
Torque to 20-25 ft. lbs (27-34 N.m)
2
10
75
73
52
110
82
1
85
83
84
87
42
101 88
86
92 93
94
95
99
1
105
68
104
103
69
43
46
F
. 4
IG
74
117
77
78
79
80
81
89
90
97
96
106
2
86
102
107
96
97
98
100
71
44
43a
45
67
307714E
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