Graco 231-353 Instructions-Parts List Manual page 25

Displacement Pump Repair
11. Place a new o-ring (116*) firmly in the cylinder
groove. See Fig. 22.
12. Coat the piston rod and packings with oil. Carefully
slide the assembly into the top of the cylinder
(115). See Fig. 22.
13. Put the manifold upside down in a vise. Fully
thread the jam nut (117) onto the cylinder (115).
Guide the rod/cylinder assembly down through the
manifold (101). Screw the cylinder (115) into the
manifold. See Fig. 22.
Torque jam nut (117)
to 73 ft–lb (98 N.m)
Torque cylinder (115)
into manifold (101) to
53 ft–lb (71 N.m)
Torque intake valve (116)
into cylinder (115) to
53 ft–lb (71 N.m)
Piston assembly
Fig. 22
14. Place the ball guide (120), stop pin (122) and ball
(121*) in the cylinder (115). Screw the intake valve
into the cylinder and torque to 53 ft-lb
(71 N.m). This will also properly torque the cylinder
into the manifold. See Fig. 23.
15. Torque the cylinder jam nut (117) to 73 ft-lb
(98 N.m). See Fig. 22.
16. Install the pump. See page 22.
Leather packings
Poly packings
Lips of V–packings
must face down
102
101
*103
*105
107
*116
116*
110
111
117
*113
115
115
120
118
*119
01072A
118
Fig. 23
Lips of V–packings
must face up
Torque to 53 ft–lb
(71 N.m)
107
123
102
104*
106*
101
109*
117
112*
114*
108*
122*
121*
01073