22 308793
Service
Disconnecting the Displacement Pump
NOTE: To change only the throat packings without
removing the displacement pump from the motor, refer
to page 25.
If you are doing a complete service of the displace-
ment pump, disconnect it from the motor as described
in the applicable procedure on this page, and disas-
semble the pump as described on page 27.
NOTE: In stand or wall-mounted installations, you do
not have to remove the entire pump from its mounting.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 15.
1. Relieve the pressure.
2. Disconnect the hoses from the displacement pump
and plug the ends to prevent fluid contamination.
3. Disconnect the displacement pump from the motor
as follows:
D For Senator and Bulldog pumps (Fig. 7):
Unscrew the coupling nut (A). Unscrew the
locknuts (B) from the tie rods (C). Pull the
displacement pump (D) off the motor (E).
Remove the pin (F) and screw the coupling
(G) off the piston rod (H).
D For President (Fig. 8) and Viscount (Fig. 9)
pumps: Unscrew the coupling nut (K) from the
piston rod (H). Unscrew the locknuts (B) from
the tie rods (C). Pull the displacement pump
(D) off the motor (E).
01926B
Fig. 7
1
2
Torque to 102–109 NSm
(75–80 ft-lb).
Torque to 68–75 NSm
(50–55 ft-lb).
Senator Pump Shown
1
2
D
B
C
A
J
E
G
F
H
Lubricate threads.
3
3
Reconnecting the Displacement Pump
1. Reconnect the displacement pump to the motor as
follows:
D For Senator and Bulldog pumps (Fig. 7):
Make sure the coupling nut (A) and o-ring (J)
are in place on the coupling (G). Screw the
coupling onto the piston rod (H) and install the
pin (F). Orient the displacement pump (D) to
the motor (E) as shown. Position the displace-
ment pump (D) on the tie rods (C). Lubricate
the threads of the tie rods. Screw the locknuts
(B) onto the tie rods loosely. Screw the cou-
pling nut (A) onto the motor shaft and torque to
102–109 NSm (75–80 ft-lb). Torque the tie rod
locknuts to 68–75 NSm (50–55 ft-lb).
