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Repair
Repair
•
To service the lower, see manual 311832.
•
To service the air motor, see manual 311238.
•
To service the hydraulic motor, see manual
308048.
Disconnect the Lower
To service the lower, follow the procedure on this page,
and disassemble the lower as described in manual
311832.
In stand or wall-mounted installations, you do not
have to remove the entire pump from its mounting.
1. Relieve the pressure, see Pressure Relief Proce-
dure page 11.
2. Disconnect the hoses from the lower and plug the
ends to prevent fluid contamination.
3. Unscrew the coupling nut (K) from the motor shaft
(F) and remove the collars (G). Remove the cou-
pling nut from the piston rod (H). Unscrew the lock-
nuts (B) from the tie rods (C). Pull the motor (E) off
the lower (D). See F
Reconnect the Lower
If the tie rods (C) have been disassembled from the
motor, see Reassemble the Tie Rods to the Motor
on page 15.
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 50-60
ft-lb (68-81 N•m).
14
. 6 and F
. 7.
IG
IG
3. Insert the collars (G) into the coupling nut (K).
Tighten the coupling nut onto the motor shaft (F)
and torque to 145-155 ft-lb (196-210 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.
NXT Air-Powered
Pump Shown
2
1
Torque to 145-155
ft-lb (196-210 N•m).
2
Torque to 50-60 ft-lb
(68-81 N•m).
3
Apply lubricant and
PTFE tape.
2
F
. 6
IG
C
G
3
B
TI8382b
311831E
E
F
3
K
1
H
D
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