824-000
23
Displacement Pump Repair
3.
Tighten the nut (110) onto the piston valve (108) to
2 in-lb (0.23 N.m). See Fig. 19.
Fig. 19
Torque to
2 in–lb (0.23 N.m)
Apply one drop of
sealant to these
threads
109*
*111
*113
112*
107
108
114*
110
1720
*125
*126
NOTE: Note the alignment of the piston (108) to the
nut (110). Maintain this alignment through Step 8.
4.
Clean all residue from the piston valve threads.
Apply one drop of adhesive, supplied, to the
threads.
5.
Place the ball (109*) on the piston valve (108). See
Fig. 19.
CAUTION
Step 6, 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. 20.
7.
Place the flats of the rod (107) in a smooth jaw
vise.
8.
CAREFULLY tighten the nut (110) against the pis-
ton rod to 19 ft-lb (25 N.m). See Fig. 20.
Use two wrenches to maintain the alignment men-
tioned in NOTE below Step 3.
Fig. 20
Torque nut against rod
to 19 ft–lb (25 N.m)
Do not allow nut (110)
to move relative to
piston (108) when
tightening piston
against rod.
107
108
1721
110
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. 22.
10. Install the packing nut (102) and plug (123), but
leave loose for now. See Fig. 22.
