307–758
37
DISPLACEMENT PUMP REPAIR
3.
Tighten the packing retaining nut (211) against the
piston valve (222) to 19 ft-lb (27 N.m).
Note the alignment of the piston (222) to the pack-
ing retainer nut (211). Maintain this alignment
through Steps 5, 6 and 7.
4.
Place the ball (225) on the piston valve (222). See 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 piston
valve threads. Then hand tighten the valve assembly
into the piston rod just until the nut (211) contacts the
rod. See Fig 37–1.
211
Fig 37–1
POLY
*212
LIPS FACE UP
0029
222
203*
LIPS FACE DOWN
215*
225*
APPLY ONE DROP
OF SEALANT TO
THESE THREADS
224
TORQUE TO
10.5 in-lb (1.2 N.m)
to seat the packing,
and then back off and
tighten finger tight.
*210
214*
206*
LEATHER
LIPS FACE UP
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). See Fig
37–2.
Use two wrenches to maintain the alignment men-
tioned in Step 7, above.
Fig 37–2
224
211
TORQUE NUT
AGAINST ROD TO
19 ft–lb (27 N.m)
DO NOT ALLOW NUT
(211) TO MOVE WHEN
INSTALLING PISTON
ONTO ROD
01238
8.
Stack the male gland (208*), alternate packings
(213*,207*), and female gland (209*) into the top of
the cylinder (219). See Fig 37–3.
9.
Install the packing nut (216) and plug (205), but leave
loose for now.
See Fig 37–3.
10. Coat the piston rod and packings with oil. Carefully
slide the assembly INTO THE TOP OF THE
SLEEVE.
NOTE: The tapered end of the sleeve is the bottom of it.
See Fig 38–1.
11. Place a new o–ring (217*) firmly in the cylinder
groove. See Fig 37–3.
219
Fig 37–3
212*
POLY
LIPS MUST
FACE UP
213*
POLY
LIPS MUST
FACE UP
205
*206
LEATHER
LIPS MUST
FACE UP
*203
U–CUP SEAL
LIPS MUST
FACE DOWN
215*
214*
*202
*217
*208
*207
LEATHER
LIPS MUST
FACE DOWN
*209
41
218
216
211
TORQUE TO:
67 ft-lb
(90 N.m)
*210
01197