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Displacement Pump Repair
3. Tighten the nut (110) onto the piston valve (108) to
2 in-lb (0.23 N.m). See Fig. 19.
Torque to
1
2 in–lb (0.23 N.m)
Apply one drop of
2
sealant to these
threads
110
*111
*113
*125
*126
Fig. 19
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
7. Place the flats of the rod (107) in a smooth jaw
107
109*
8. CAREFULLY tighten the nut (110) against the
112*
114*
108
1720
Fig. 20
9. Stack these parts one at a time into the top of the
10. Install the packing nut (102) and plug (123), but
the nut (110) contacts the rod. See Fig. 20.
vise.
piston 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.
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.
110
1
2
manifold (101): the male gland (106*), alternately
three plastic packings (104*) with two leather
packings (105*), and then the female gland (103*).
See Fig. 22.
leave loose for now. See Fig. 22.
107
108
1721
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