10
DISPLACEMENT PUMP SERVICE
To reduce the risk of serious bodily injury, including
injection, splashing in the eyes, or injury from mov-
ing parts, always follow the
Pressure Relief Proce-
dure Warning
on page 8 when checking or servic-
ing any part of the spray/dispensing system, when
installing, cleaning or changing spray tips/nozzles,
and whenever you stop
spraying/dispensing.
WARNING
(See Fig 3 unless otherwise noted.)
1. Flush the pump with compatible solvent if possible.
Follow the
Pressure Relief Procedure Warning
on
page 8.
2. Disconnect the hoses, remove the pump from its
mounting, and clamp it in a vise. Unscrew the cou-
pling nut (9) and the tie rod locknuts (3). Remove the
cotter pin (1), loosen the jam nut (5), and unscrew the
connecting rod (11) from the displacement rod (108).
Pull the motor away from the displacement pump.
NOTE:
If you are using a repair kit to service the pump,
use all the new parts. See pages 15 and 17 for
available kits. Parts included in the kits are
marked with a double asterisk, for example,
(124**), in the text and drawings.
3. Place the pump housing (109) in a padded jaw vise
with the outlet (107) against one jaw.
4. Remove the wet–cup (101), wet–cup packing nut
(136), and packing nut (140). Remove the packings
from the packing nut.
5. Push the displacement rod (108) down so the prim-
ing piston (119) clears the intake cylinder (117).
6. Use two wrenches to oppositely turn and loosen the
hex nuts (120) on the piston rod (122).
7. Remove the valve plate (118), valve guide (121), and
the priming piston (119).
8. Remove the intake cylinder (117) and o–ring (124).
9. Pull on the piston rod (122) to remove the displace-
ment rod (108) from the pump housing (109).
10. Remove the cotter pin (126) and unthread the piston
rod (122) from the piston valve (112).
11. Remove the packing nut (1 14) from the piston rod
(122). Remove the packings and female gland from
the intake cylinder’s packing housing (REF 117).
Fig 3
120
TORQUE TO 54–81
N.m
(40–60 ft–lb)
119
Ref 117
**114
TORQUE TO
37–47 N.m
(25–35 ft–lb)
124**
125**
117
TORQUE TO
129–149 N.m
(94–110 ft–lb)
122
120
118
121
109
112
APPLY SEALANT
AND
TORQUE TO
81–102 N.m
(60–76 ft–lb)
111
**126
110
APPLY
SEALANT TO
THREADS
107
TORQUE TO
420–460 N.m
(310–340 ft–lb)
125**
132
140
135
TORQUE TO
420–460 N.m
(310–340 ft–lb)
101
1
11
9
1
5
108
136
TORQUE TO
54–81 N.m
(40–60 ft–lb)
SEE FIG 5
SEE FIG 6
SEE FIG 4
113
102**
134
Summary of Contents for Power-Flo Series
Page 2: ......
