Displacement Pump Repair - Graco 231–034 Instructions And Parts List

Displacement Pump Repair

Reassemble the Pump.
NOTES:
Install the leather and plastic packings exactly as
indicated and as shown in Figures 34 and 38. Incor-
rect installation causes the pump to leak and may
damage the packings.
Clean and inspect all sides of the parts. Replace
any parts that are worn or damaged. Those parts
will not seal properly with new parts.
Soak the leather packings in oil before using them.
1. Stack the backup washer (214), the seal (203*),
and the female gland (215*) on the piston valve
(222). Alternately stack the packings (212*,206*),
and then male gland (210*) on the piston valve
(222). See Fig. 34.
2. Tighten the nut (211) against the piston valve
(222). Torque the nut to 19 ft-lb (27 N.m).
Note the alignment of the piston (222) to the nut
(211). Maintain this alignment through Step 7.
3. Place the ball (225) on the piston valve (222). See
Fig. 34.
CAUTION
Step 4 is critical. Follow the procedure carefully to
avoid damaging the packings by overtightening.
4. Apply one drop of adhesive, supplied, to the
threads of the piston valve assembly. Hand tighten
the assembly in to the piston rod just until the nut
(211) makes contact with the rod (224). See Fig.
34.
Torque the nut to 10.5 in-lb (1.2 n.m) to seat the packing.
Loosen the nut and then lightly retighten.
Apply one drop of sealant t othese threads.
The lips of the V–packings must face up.
The lips of the U–cup packing must face down.
211
*210
212
222
Fig. 34
5. Place the flats of the piston rod in a vise.
6. Use a wrench to carefully tighten the nut (211) on
to the piston rod. Torque the nut to 19 ft-lb (25
N.m). See Fig. 35.
7. Use two wrenches to maintain the alignment men-
tioned in Step 7, above.
Torque the nut against the
rod to 19 ft–lb (27 N.m).
Do not allow the nut to
move when installing the
piston valve assembly on
to the rod.
Fig. 35
224
225*
206*
215*
203*
214*
03178
224
211