Repair
311690M 7
guard retaining nut or hose end coupling to relieve
pressure gradually, then loosen completely. Clear
hose or tip obstruction.
Disconnect the Lower
To disconnect the lower, follow the procedure on this
page. See pages 8-11 for procedures to repair lower. To
disconnect pump from an electric circulation assembly,
EPXXXX, see manual 311594.
1. Relieve the pressure, see Pressure Relief Proce-
dure page 6.
2. Disconnect the hoses from the lower and plug the
ends to prevent fluid contamination.
3. Loosen the coupling nut (K) and remove the collars
(G). Remove the coupling nut from the piston rod
(H). Unscrew the locknuts (B) from the tie rods (C).
Pull the lower (D) off the motor (E). See F
IG. 2 and
F
IG. 3.
Reconnect the Lower
1. Assemble the coupling nut (K) to the piston rod (H).
2. Orient the lower (D) to the motor (E). Position the
lower on the tie rods (C). Lubricate the threads of
the tie rods. Screw the tie rod locknuts (B) onto the
tie rods. Tighten the locknuts and torque to 50-55
ft-lb (68-75 N•m).
3. Insert the collars (G) into the coupling nut (K).
Tighten the coupling nut onto the piston rod (H) and
torque to 90-100 ft-lb (122-135 N•m).
4. Flush and test the pump before reinstalling it in the
system. Connect hoses and flush the pump. While it
is pressurized, check for smooth operation and
leaks. Adjust or repair as necessary before reinstall-
ing in the system. Reconnect the pump ground wire
before operating.
CAUTION
Hydraulic-Powered Pumps only: When shutting down
the hydraulic system, always shut off the hydraulic
supply line shutoff valve first, and then the return line
shutoff valve to prevent overpressurizing the motor or
its seals. When starting the hydraulic system, open
the return line shutoff valve first.
In stand or wall-mounted installations, you do not
have to remove the entire pump from its mounting.
If the coupling rod (F) and tie rods (C) have been
disassembled from the motor, see Reassemble the
Coupling Rod and Tie Rods to the Motor on page 8.
FIG. 2
NXT Pump
Shown
TI8394a
1
Torque to 90-100 ft-lb
(122-135 N•m).
Torque to 50-60 ft-lb
(68-81 N•m).
Apply anti-seize
lubricant.
1
2
3
C
K
H
2
E
B
3
2
G
F
D
3
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