Graco 231–034 Instructions And Parts List page 39

Displacement Pump Repair
8. Stack the glands and packings in the top of the
cylinder (219). Be sure to alternate the leather
(207*) and plastic (213) v–packings and stack the
v–packings so the lips face down. See Fig. 38.
9. Install the packing nut (216) and the plug (205),
but leave the nut loose for now. See Fig. 38.
10. Oil the piston rod and the packings. Carefully slide
the assembly (A) into the top of the sleeve
(218).
NOTE: The tapered end (B) of the sleeve (218) is the
bottom of it. See Fig. 36.
Oil the piston rod
and the packings.
Fig. 36
11. Place a new o–ring (217*) firmly in the cylinder
groove. See Fig. 38.
12. Slide the sleeve and piston rod assembly (C) into
the bottom of the cylinder (219). This is to pre-
vent packing damage during reassembly. See Fig.
36.
Fig. 37
13. Screw down the cylinder locknut (47) until it is fin-
ger tight at the bottom of the external cylinder
threads.
14. Place the flats of the intake valve (223) in a vise.
Install a new o-ring (202*). Screw the pump cylin-
der into the valve. Torque to 70 ft-lb (95 N.m). See
Fig. 38.
15. Install the pump.
218
A
B
219
C
Leather packings.
Poly packings.
The lips of these packings must face down.
The lips of these packings must face up.
Torque the intake valve to 70 ft–lb (95 N.m).
205
216
*209
47
*207
*208
*217
219
218
*210
*206
*203
*202
Fig. 38
213*
212*
215*
214*
223