Graco C Series Instructions Manual page 7

8. Inspect the outer surface of the displacement rod
(1) and the polished inner surface of the cylinder
sleeve (12) for scoring or wear by running a finger
over the surface or holding the part up to a light at
an angle. Damage to these parts may cause
premature packing wear or leaking. If either part is
worn or scratched, replace it.
NOTE: If replacing the sleeve (12), be sure to install it
with the notched end up, and replace the o-ring (10*)
in the notch. If the old sleeve is hard to remove, con-
tact your Graco representative.
9. Unscrew the piston stud (20) from the displace-
ment rod (1). Remove the ball (13), shims (14),
backup washers (15), glands (16 and 19), and
v-packings (18). Clean all parts and inspect for
damage. If the seat on the piston stud (20) is
nicked or worn, replace it.
10. Remove the packing nut/wet-cup (2).
11. 239388 Pump Model only: Remove the seal
guard kit (5) and washer (8) from the packing
nut (2).
12. Remove the bearing (3), glands (4 and 7), and
v-packings (6) from the throat of the pump cylinder
(11). Clean all parts and inspect for damage.
13. Lubricate all packings before reassembling the
pump.
14. One at a time, place a male gland (7*), four PTFE
v-packings (6*), a female gland (4*), and the
bearing (3*) in the throat of the cylinder (11). Be
sure the lips of the v-packings face down in the
throat. See Fig. 1.
15. 239388 Pump Model only: Install the washer (8)
and seal guard kit (5) into the packing nut (2).
Pack the packing nut inside and outside with
Vaseliner. Use Vaseliner brand petroleum jelly
only.
16. Loosely install the packing nut (2).
17. One at a time, place a backup washer (15), a
female gland (19*), four PTFE v-packings (18*), a
male gland (16*), and a backup washer (15) on
the piston stud (20). Be sure the lips of the v-pack-
ings face up on the piston. See Fig. 1.
Service
18. All Pump Models except 948640 and 948641:
Add shims (14*) below the top backup washer
(15*), using as many as necessary to obtain a total
packing stack height of 0.950–0.975 in.
(24.13–24.77 mm). For pump model 222017 use
stack height of 0.960–0.975 in. (24.38–24.77 mm).
19. Place the ball (13*) on the piston stud (20). Apply
liquid thread sealant to the piston threads and
screw the piston assembly into the displacement
rod (1), torquing it to 200 in-lb (23 N.m).
20. Lubricate the displacement rod (1), and guide it
through the bottom of the pump cylinder (11) and
carefully through the throat packings.
21. Install the o-ring (22*) on the intake valve housing
(24).
22. Place the ball (23*) on the seat of the intake valve
housing.
23. Slip the o-ring retainer (30) onto the intake housing
and align the holes in the two parts.
24. Compress spring (33*) on the ball (23*).
25. Install the ball stop pin (21) through the o-ring
retainer and intake valve housing (24), and screw
the housing into the pump cylinder (11). Torque
the housing to 50–60 ft-lb (70–80 NSm).
26. All Pump Models except 239388: Torque the
packing nut (2) to 50–60 ft-lb (70–80 NSm).
239388 Pump Model: Torque the packing nut (2)
to 20–25 ft-lb (30–35 NSm).
27. All Pump Models except 239388: Fill the packing
nut cavity with Throat Seal Liquid (TSL) for paints
and resins, or ISO Pump Oil (217374) for moisture
sensitive materials such as isocyanates.
28. Screw the displacement rod (1) into the air motor
connecting rod.
NOTE: If the ground wire was disconnected before
servicing, reconnect it before operating the pump.
Check that the entire system is properly grounded.
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