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Maintenance
A708-01-880 Issue E
Use the following procedure to remove the pump motor. Ensure that the pump motor is adequately supported
throughout and does not fall: the masses of the pump motors are given in Section 2.3.
1. Ensure that the electrical supply cable is isolated from the electrical supply.
2. Refer to Figure 1, 2 and 3. Remove the cover from the pump motor terminal box (2), then disconnect the
electrical supply cable (and the motor thermistors cable, if separate) from the terminal box.
3. Refer to Figure 14. Fit slings and suitable lifting equipment to support the pump motor (1), then remove the
fixing bolts (2) which secure the pump motor flange (3) to the coupling housing (15).
4. Use the lifting equipment to move the pump motor (1) away from the pump, then carefully lower the pump
motor, so that it rests on the floor in an upright orientation (that is, with the drive hub (19) at the top).
5. Remove the gasket (6) from the motor flange (3) or coupling housing (15).
6. Undo and remove the two set screws (8) in the drive hub (19).
7. Use a suitable puller tool to remove the drive hub (19) from the motor shaft (4), then remove the key (5) from
the motor shaft. Dispose of the key.
8. If disposing the pump motor: refer to Section 6.2.
9. Inspect the flexible coupling insert (18): if necessary, replace it.
5.11.2 Fit the new pump motor
Ensure that the pump motor flange and the coupling housing flange are clean and free of burrs. If not, the pump
motor and coupling housing may be misaligned and may damage the pump motor, the pump or the drive coupling
when operating the pump.
1. Refer to Figure 14. Inspect the motor shaft (4) of the new pump motor (1). The motor shaft must be free of burrs
and dirt. If necessary, clean or refinish the motor shaft.
2. Inspect the motor shaft bore of the drive hub (19). The bore must be free of burrs and dirt. If necessary, clean or
refinish the bore.
3. Fit the new key (5, supplied with the new motor) into the motor shaft (4).
4. Loosely fit the drive hub (19) onto the motor shaft (4), so to subsequently move it (in Step 13) into the correct
position.
5. Inspect the mating flange of the coupling housing (15) and the motor flange (3). The flanges must be free of
burrs and dirt. If necessary, clean or refinish the flanges.
6. Use suitable lifting equipment to lift the pump motor (1) off the floor and move it close to the pump.
7. If necessary, fit slings around the pump motor (1) and attach suitable lifting equipment to the slings. Use both
sets of lifting equipment to turn the pump motor so that it is horizontal, with the pump motor terminal box at
the top, and with the drive hub (19) towards the coupling housing (15).
8. Place the bolts (2) through the fixing-holes in the motor flange (3) and place the gasket (6) in position on the
flange.
9. Undo and remove the four bolts (17) which secure one of the coupling covers (16) to the coupling housing (15),
then remove the coupling cover.
Ensure that the pump motor cannot fall when fitting it. The pump motor is heavy and can cause
injury to people if it falls.
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