37
307–785
DISPLACEMENT PUMP REPAIR
3. Tighten
the packing retaining
nut (21
1) onto the pis
-
ton
valve (222) to 19 ft –lb (27 N.m).
Note
the alignment
of the
piston (222) to the pack
-
ing retainer nut (21 1). Maintain this alignment
through
Steps 5, 6 and 7.
4. Place
the ball (225) on the piston valve (222).
Refer
to
Fig 37–1.
CAUTION
Step
5 is critical.
Follow the procedure carefully to
avoid
damaging the packings by overtightening.
5. Apply
one drop of
adhesive, supplied, to the threads
of the piston valve. Then hand tighten the valve as-
sembly
into the piston rod just
until the nut (21
1) con
-
tacts
the rod.
Refer to Fig 37–1.
211
TORQUE
T
O
10.5 in-lb (1.2 N.m)
to seat the packing,
and then back of
f and
tighten finger tight.
Fig
37–1
222
210*
203*
LIPS
F
ACE DOWN
215*
225*
APPLY ONE DROP
OF SEALANT T
O
THESE THREADS
LEA
THER
*206
POLY
*212
LIPS F
ACE UP
224
6. Place
the flats at the top of the rod in a vise.
7. Use a wrench to CAREFULLY tighten the nut (211)
onto
the piston rod to 19 ft–lbs (25 N.m).
Refer to Fig
37–2.
Use two wrenches to maintain the alignment men-
tioned
in Step 7, above.
Fig 37–2
224
211
TORQUE
NUT
ONTO ROD TO
19 ft–lb
(27 N.m)
DO NOT ALLOW NUT
(211)
T
O MOVE
WHEN
INSTALLING
PIST
ON
ONTO ROD
8. One
at a time stack the male
gland (208*), alternate
the
packings (213*,207*), and then
install the female
gland
(9), into the top of the cylinder (219).
Refer to
Fig 37–3.
9. Install
the packing
nut (216) and plug (205), but leave
loose
for now.
Refer to Fig 37–3.
10. Coat the piston rod and packings with oil. Carefully
slide the assembly INT O THE T OP OF THE
SLEEVE.
NOTE: The
tapered end of the sleeve is the bottom of
it.
Refer
to Fig 38–1.
11. Place a new o–ring (217*) firmly in the cylinder
groove.
Refer to Fig 37–3.
219
Fig 37–3
212*
POLY
LIPS
MUST
F
ACE UP
213*
POLY
LIPS MUST
F
ACE UP
205
*206
LEATHER
LIPS MUST
F
ACE UP
*203
U–CUP SEAL
LIPS MUST
FACE DOWN
215*
214*
*202
*217
*208
*207
LEATHER
LIPS MUST
FACE DOWN
*209
47
DET
AIL OF
THROA
T P
ACKINGS
DET
AIL OF
PISTON PACKINGS
218
216
211
TORQUE TO:
67 ft-lb
(90 N.m)
*210
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