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Displacement Pump Repair
11. Place a new o-ring (116*) firmly in the cylinder
groove. See Fig. 21.
12. Coat the piston rod and packings with oil. Carefully
slide the assembly into the top of the cylinder
(115). See Fig. 21.
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. 21.
Torque jam nut (117)
1
to 73 ft–lb (98 N.m)
Torque cylinder (115)
2
into manifold (101) to
53 ft–lb (71 N.m)
Torque intake valve (116)
3
into cylinder (115) to
53 ft–lb (71 N.m)
4
Piston assembly
Fig. 21
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. 22.
15. Torque the cylinder jam nut (117) to 73 ft-lb
(98 N.m). See Fig. 21.
16. Install the pump. See page 21.
1
Leather packings
2
Poly packings
Lips of V–packings
3
must face down
102
101
*103
*105
1
*116
107
110
*111
116*
*113
117
1
4
115
108
115
118
120
*119
05118
118
5
Fig. 22
4
5
3
Lips of V–packings
must face up
Torque to 53 ft–lb
(71 N.m)
107
123
102
104*
2
3
106*
101
117
112*
2
4
114*
125*
126*
122*
121*
03147
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