Pump Repair
333397A
11
Reassemble the Displacement
Pump
1.
See F
. 12, page 18. Lubricate the throat packings
and install them in the outlet housing (116) one at a
time as follows, with the lips of the v-packings facing
down: the male gland (106*), two neoprene v-pack-
ings (109*), one UHMWPE v-packing (119*), and
the female gland (108*). Apply thread lubricant and
install the enclosed wet cup (115) loosely. See
Detail A, page 12.
2.
If you removed the cylinder (111), be sure to replace
the o-ring (104). Lubricate the o-ring and apply
thread lubricant to the cylinder, then reinstall the cyl-
inder in the outlet housing (116).
3.
Lubricate the piston packings and install them onto
the piston stud (114) one at a time in the following
order, with the lips of the v-packings facing up: the
female gland (127*), one UHMWPE v-packing
(125*), one neoprene v-packing (119*), one UHM-
WPE v-packing (125*), the male gland (124*), the
shim (129*), and the washer (123*). See Detail B,
page 12.
4.
Screw the piston stud (114) onto the piston mount-
ing stud (128). Torque to 50–70 ft-lb (68–95 N•m).
Install the piston ball (102*) on the piston seat. Slide
the ball stop pin (110*) into the desired set of holes,
and secure with the cotter pin (101*).
5.
Place the flats of the displacement rod (107) in a
vise. Screw the piston assembly onto the displace-
ment rod. Torque to 50–70 ft-lb (68–95 N•m).
6.
Insert the displacement rod (107) into the bottom of
the cylinder (111), and be careful not to scratch the
cylinder. Push the rod straight up until it protrudes
from the enclosed wet cup (115).
7.
Install the ball (102*), guide (122), o-ring (112), and
ball stop pin (105*) in the intake valve housing
(113). Place the intake valve assembly in the lock-
ing ring (117). Apply thread lubricant to the locking
ring and cylinder (111), and screw the ring onto the
cylinder.
8.
Reconnect the displacement pump to the air motor
(see page 10).