Mg 71 And Mg 80 Motors; Mg 90, Mg 100, Mg 112 And Mg 132 Motors; Equipment - Grundfos CM SP Service Instructions Manual

5.4 MG 71 and MG 80 motors

Dismantle the pump before dismantling the motor. See section
5.2 Dismantling the pump.
5.4.1 Dismantling the motor
1. Remove screws (pos. 152).
2. Remove fan cover (pos. 151).
3. Remove fan (pos. 156) and seal ring (pos. 159a).
4. Remove screws (pos. 181).
5. Remove motor flange (pos. 156b) and gasket (pos. 157a).
6. Remove diverting disc (pos. 79), O-ring (pos. 158a) and
bearing cover plate (pos. 155).
7. Pull shaft (pos. 51) out of stator housing (pos. 150).
8. Pull bearing (pos. 153) off shaft (pos. 51).
9. Remove O-ring (pos. 159) and spring (pos. 158).
10. Pull bearing (pos. 154) off shaft (pos. 51).
5.4.2 Assembling the motor
1. Push bearing (pos. 154) on shaft (pos. 51).
2. Fit spring (pos. 158) and O-ring (pos. 159). See fig. 8.
Correct fitting of spring and O-ring
Fig. 8
3. Push bearing (pos. 153) on shaft (pos. 51).
4. Fit shaft (pos. 51) in stator housing (pos. 150).
5. Fit bearing cover plate (pos. 155), O-ring (pos. 158a) and
diverting disc (pos. 79). Lubricate the surface of the cover
plate (pos. 155) turning against the bearing. Lubricate O-ring
(pos. 158a).
For correct lubricant, see section
lubricants.
6. Fit gasket (pos. 157a) and motor flange (pos. 156b).
7. Fit and cross-tighten screws (pos. 181). See section
3. Tightening torques and lubricants.
8. Fit and lubricate seal ring (pos. 159a).
For correct lubricant, see section
lubricants.
9. Fit fan (pos. 156).
10. Fit fan cover (pos. 151).
11. Fit and tighten screws (pos. 152). See section
torques and lubricants.
8
3. Tightening torques and
3. Tightening torques and
3. Tightening

5.5 MG 90, MG 100, MG 112 and MG 132 motors

Dismantle the pump before dismantling the motor. See section
5.2 Dismantling the pump.
5.5.1 Dismantling the motor
1. Remove screws (pos. 152).
2. Remove fan cover (pos. 151).
3. Remove fan (pos. 156) and seal ring (pos. 159a).
4. Remove staybolts (pos. 181).
5. Remove motor flange (pos. 156b), gasket (pos. 157a) and
bearing cover (pos. 156a).
6. Remove diverting disc (pos. 79), O-ring (pos. 158a) and
bearing cover plate (pos. 155).
7. Pull shaft (pos. 51) out of stator housing (pos. 150).
8. Pull bearing (pos. 153) off shaft (pos. 51).
9. Remove O-ring (pos. 159) and spring (pos. 158).
10. Pull bearing (pos. 154) off shaft (pos. 51).
5.5.2 Assembling the motor
1. Push bearing (pos. 154) on shaft (pos. 51).
2. Fit spring (pos. 158) and O-ring (pos. 159). See fig. 9.
Correct fitting of spring and O-ring
Fig. 9
3. Push bearing (pos. 153) on shaft (pos. 51).
4. Fit shaft (pos. 51) in stator housing (pos. 150).
5. Fit bearing cover plate (pos. 155), O-ring (pos. 158a) and
diverting disc (pos. 79). Lubricate the surface of the cover
plate (pos. 155) turning against the bearing. Lubricate O-ring
(pos. 158a).
For correct lubricant, see section
lubricants.
6. Fit bearing cover (pos. 156a), gasket (pos. 157a) and motor
flange (pos. 156b).
7. Fit and cross-tighten staybolts (pos. 181). See section
3. Tightening torques and lubricants.
8. Fit and lubricate seal ring (pos. 159a). For correct lubricant,
see section
3. Tightening torques and
9. Fit fan (pos. 156).
10. Fit fan cover (pos. 151).
11. Fit and tighten screws (pos. 152). See section
torques and lubricants.
12. Only cast iron pumps: Fit discharge part (pos. 2).
13. Only cast iron pumps: Fit and tighten screws (pos. 2b).
See section
3. Tightening torques and
3. Tightening torques and
lubricants.
3. Tightening
lubricants.