Displacement
Pump
Reassembling
the
Pump
NOTE:
Alternate leather and plastic packings as shown
in Fig. 27. The lips of the throat
"V"
packings
must face down. The lips of the piston
"V"
pack-
ings must face up.
The
lips of the U-cup seal
(203*) face down. Incorrect installation dam-
ages the packings and results in pump leaking.
NOTE
Soak leather packings in oil before using them.
1. Check the outside of the piston rod (224) and the
inside of the sleeve (218) for scoring or scratches.
If
these parts are damaged, new packings will not
seal properly. Replace these parts
if
needed.
2.
Stack the backup washer (214), seal (203*),
fe-
male gland (215*), alternate packings
(212*,206*), and then male gland (210*) onto the
piston valve
(222).
See Fig.
25.
3. lighten the packing retaining nut (21 1) against
the piston valve (222) to
10.5
in-lb (1.24 Nm).
packing retainer nut
(21
1).
Maintain this alignment
Note
the alignment
of the piston (222)
to
the
through Steps 5,6 and 7.
4. Place the ball (225) on the piston valve
(222).
See
Fig. 27.
avoid damaging the packings by overtightening.
APPLY ONE DROP
OF SEALANT TO
THESE THREADS
UPS
FACE
UP
LIPS FACE UP
UPS
FACE DOWN
Flg.
27
6. Place the flats at the top of the rod in a vise:
7. Use a wrench to
CAREFULLY
tighten the nut
(21
1) onto the piston rod to 19 ft-lbs
(25
Nm).
See Fig.
28.
Use
two
wrenches to maintain the alignment men-
tioned in Step 7, above.
~
I,
224
211.
TORQUE NUT
AGAINST
ROD
TO
19
ft-lb
(27 N.m)
DO
NOT ALLOW NUT
211
TO
MOVE
WHdN IdSTAWNO
PISTON ONTO
ROD
Fig.
28
01238
8.
Stack the male gland (208*), alternate packings
(213*,207*), and female gland (9) into the top
of
5.
Apply one drop of adhesive, supplied, to the pis- the cylinder (219). See Fig. 29.
ton valve threads. Then hand tighten the valve
assembly into the piston rod
just
until the nut
(21 1) contacts the rod. See Fig. 27.
9. Install the packing nut (216) and plug
(205),
but
leave
loose
for now. See Fig. 29.
308-560
31
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