GB
Form no.: L453147GB– revision 06/2013
7.
Service and maintenance
7.3
Replacing the motor
The standard motor of the W+ pump has a locked front bearing.
If the motor is replaced, the new motor must also have a locked
front bearing. The motor bearing is enclosed and permanently
lubricated.
A "small flange" (B34) for frame sizes and a "large flange" (B35) in
case of large constructions.
When replacing the motor, follow the instructions below. For
the replacement of bearings, see the motor supplier's service
instructions.
1.
Switch off the power supply, and then disconnect the pump and
motor from the system.
2.
Remove the pump body. See 7.2, paragraph 1-4.
3.
Dismantle the impeller.
4.
Remove the motor shroud and, if possible, place the pump vertically
on the motor's fan cover. Fig. 7.
5.
Release the four motor flange screws and remove them (Fig.7).
6.
Lift the back plate (item 7) and extension frame (which are still
bolted together) off the shaft. See Fig. 10.
Remove the spacer flange (item 17) (where fitted).
7.
See Fig. 8. Loosen the screws at the base of the shaft, remove the
shaft and replace the motor.
8.
See Fig. 9. Before mounting the new pump shaft, remove any dirt
and grease from the motor shaft and the base's internal clamping
surfaces. Loosely mount the pump shaft. Position the balance hole
over 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/brackets.
12.
Fit the impeller and secure it with the cap nut/inducer.
Remember to use the proper tightening torque:
M10:
45 Nm (33 ft-lb)
M14:
70 Nm (52 ft-lb)
M20:
200 Nm (148 ft-lb)
Fig. 7
Fig. 8
Fig. 9
Rear flange
Screw
Extension frame
Motor
Shaft
Screw
Motor
Keyway
Motor shaft
Balance hole
Pump shaft
13
APV
