Service; Follow The Pressure Relief Procedure - Graco C Series Instructions Manual

Displacement Pump Repair
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,

follow the Pressure Relief Procedure

on page 4 before checking or servicing
any part of the system and whenever you are
instructed to relieve the pressure.
NOTE: Repair Kits are available. See the parts list for
your pump model. All kits (except 948651) include
eight shims (14*) for use on the piston, but use only
the number required. An asterisk behind a reference
number, for example (3*), indicates that this part is
included in the repair kit.
1. Solvent flush the pump if possible.
2. Follow the Pressure Relief Procedure on page
4, stopping the pump at the bottom of its stroke.
3. Disconnect all hoses from the pump.
4. Unscrew the displacement rod (1) from the air
motor connecting rod.
5. Screw the intake valve housing (24) out of the
cylinder (11). See Fig. 1. Disassemble and clean
the valve parts. Inspect the parts for damage or
wear. If the seat in the valve housing is chipped or
worn, replace the housing (24).
6. Loosen the packing nut (2).
7. Push down on the displacement rod (1) until you
can grasp the piston stud (20). Pull the displace-
ment rod out the bottom of the cylinder (11).
SERVICE NOTES:


All Pump Models except 239388: Torque to 50–60 ft-lb (70–80 NSm).
239388 Pump Model: Torque to 20–25 ft-lb (30–35 NSm).

Apply sealant. Torque to 200 in-lb (23 NSm).

Lips of v-packings must face down.

Torque to 50–60 ft-lb (70–80 NSm).

Lips of v-packings must face up.

Add shims (14*) required to make stack height 0.950–0.975 in.
(24.13–24.77 mm). For model 222017 add shims (14) required to
make stack height 0.960–0.975 in. (24.38–24.77 mm).
Parts for 239388 Pump Model only
Fig. 1
6 307944

Service

Continued on the next page.
*5
8
*4
*7
*10
1
15

*14

15
21
*22

24


2
3*

6*
11
12
13*
16*

18*
19*

20
30
33*
23*
06913B