35
DISPLACEMENT PUMP REPAIR
3. Tighten the packing retaining nut (211) onto the piston
valve (222) to 19 ft–lb (27 N.m).
Note the alignment
of the piston (222) to the packing
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 35–1.
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 (211) con-
tacts the rod.
Refer to Fig 35–1.
211
TORQUE TO
10.5 in-lb (1.2 N.m)
to seat the packing,
and then back off and
tighten finger tight.
Fig 35–1
222
210*
203*
LIPS FACE DOWN
215*
225*
APPLY ONE DROP
OF SEALANT TO
THESE THREADS
LEATHER
*206
POLY
*212
LIPS FACE 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
35–2.
Use two wrenches to maintain the alignment men-
tioned in Step 7, above.
Fig 35–2
224
211
TORQUE NUT
ONTO ROD TO
19 ft–lb
(27 N.m)
DO NOT ALLOW NUT
(211) TO MOVE
WHEN INSTALLING
PISTON 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 35–3.
9. Install the packing nut (216) and plug (205), but leave
loose for now.
Refer to Fig 35–3.
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.
Refer to Fig 36–1.
11. Place a new o–ring (217*) firmly in the cylinder
groove.
Refer to Fig 35–3.
219
Fig 35–3
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
47
DETAIL OF
THROAT PACKINGS
DETAIL OF
PISTON PACKINGS
218
216
211
TORQUE TO:
67 ft-lb
(90 N.m)
*210