Graco ultra 750 Instruction Manual page 37

3. Tighten the packing retaining nut (211) 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
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 (211) con-
tacts the rod. Refer to Fig 37–1.
211
TORQUE TO
10.5 in-lb (1.2 N.m)
to seat the packing,
and then back off and
tighten finger tight.
*206
LEATHER
*212
POLY
LIPS FACE UP
Fig 37–1
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.
211
TORQUE NUT
ONTO ROD TO
19 ft–lb
(27 N.m)
DO NOT ALLOW NUT
(211) TO MOVE WHEN
INSTALLING PISTON
ONTO ROD
Fig 37–2
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.
DISPLACEMENT PUMP REPAIR
1). Maintain this alignment
224
225*
APPLY ONE DROP
OF SEALANT TO
THESE THREADS
210*
215*
203*
LIPS FACE DOWN
222
224
10. Coat the piston rod and packings with oil. Carefully
slide the assembly
SLEEVE.
NOTE: The tapered end of the sleeve is the bottom of it.
Refer to Fig 38–1.
11. Place a new o–ring (202*) firmly in the cylinder
groove. Refer to Fig 37–3.
205
216
*209
47
*207
LEATHER
LIPS MUST
FACE DOWN
*208
*202
219
218
*210
*206
LEATHER
LIPS MUST
FACE UP
*203
U–CUP SEAL
LIPS MUST
FACE DOWN
*202
Fig 37–3
INT O THE T OP OF THE
DETAIL OF
THROAT PACKINGS
213*
POLY
LIPS MUST
FACE UP
DETAIL OF
PISTON PACKINGS
212*
POLY
LIPS MUST
FACE UP
215*
214*
223
TORQUE TO:
67 ft-lb
(90 N.m)
307–786