Displacement Pump
CAUTION
Step 8, tightening the piston valve into the rod, is
critical. Follow the procedure carefully to avoid
damaging the packings by overtightening.
6.
Hand tighten the valve into the piston rod just until
the nut (110) contacts the rod. See Fig. 21.
107
109*
110
111
112*
114*
108
123
102
*103
*104
105*
*106
101
117
*116
115
*113
118
Fig. 19
119*
121*
120
*122
125*
126*
127
1
2
Lips down.
Lips up.
1
1
2
1
2
03149
04392
Apply one strip
of sealant to
threads
109*
*111
*113
112*
107
108
114*
110
Fig. 20
Torque to
5 in-lb (0.57 N.m)
1
2
2
1
*125
*126
03178
107
110
108
Fig. 21
1
2
Torque nut
against rod
to 30 ft–lb
(40 N.m)
Do not allow nut (110)
to move relative to piston
(108) when tightening piston
against rod.
2
1
03179
7.
Place the flats of the rod (107) in a smooth jaw
vise.
8.
Carefully tighten the nut (110) against the piston
rod to 30 ft-lb (40 N.m). See Fig. 21.
Use two wrenches to maintain the alignment men-
tioned in Fig. 21.
9.
Stack these parts one at a time into the top of the
manifold (101): the male gland (106*), alternately
three plastic packings (104*) with two leather pack-
ings (105*), and then the female gland (103*). See
Fig. 23.
10. Install the packing nut (102) and plug (124), but
leave loose for now. See Fig. 23.
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 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.
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. 22.
16. Install the pump. See page 22.
