381328 ISS Q 11.95 381329 ISS Q 11.95 381331 ISS S 11.2004
5.3 Replacement of motor
The standard motor for the W+ pump has a drive-end located bearing.
If the motor is replaced, the new motor must also have a drive-end
located bearing. The motor bearing is enclosed and permanently
lubricated, motor frames 80 - 180.
The motor has both feet and flange, “small flange” (B34) for frame
sizes 80-132, “large flange” (B35) for frame 160 and larger.
Follow the instructions below when replacing the motor. For replace-
ment of bearings, see the motor supplier's service instructions.
1.
Disconnect the pump from the power supply.
2. Removal of the pump body. See para 5.2, points 1-4.
3. Remove the impeller.
4. Remove the motor shroud and, if possible, stand the pump on the
motor’s fan cover. See Fig. 10.
5. Undo the four motor flange bolts between the motor and
extension frame and remove them. See Fig. 10.
6. Lift the back plate, extension frame and spacer flange (where
fitted), which are still bolted together, up and off the shaft. See
Fig. 10.
7.
See Fig. 11. Loosen the screws in the shaft muff, pull the shaft off
and replace the motor.
8. See figure 12. Before remounting the pump shaft, remove any
dirt and grease from the motor shaft and the muff’s internal
clamping surfaces. Mount the pump shaft loosely. Position the
balance hole above the keyway.
9.
Fit the back plate and extension frame over the shaft.
10. Tighten the bolts.
11. Stand the pump back on its legs/bracket.
12. Fit the impeller and secure it with the cap nut/inducer.
Remember to use the proper tightening torque:
M10: 45 Nm (33 lbf ft)
M14: 70 Nm (52 lbf ft)
M20: 200 Nm (148 lbf ft)
5. Maintenance
Motor
Keyway
Motor shaft
Balance hole
Pump shaft
Fig. 12
Shaft
Screw
Fig. 11
Rear flange
Screw
Extension frame
Motor
Fig. 10
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