Assembling The Product - Grundfos AMG Series Service Instructions Manual

3.4 Assembling the product

Position numbers of parts (numbers in brackets refer
to section 4.4 Sectional drawings.
Position numbers of tools (letters in brackets) refer to
section 4.2 Special tools.
Maintenance and service work on explosion-proof
products must be carried out by Grundfos or a
service workshop authorised by Grundfos.
3.4.1 Fitting the stator and motor
Lubricate and tighten the screws and nuts according
to section 4.3 Torques and lubricants.
1. Insert the bearing (1047) into the motor flange (1020) and fit
the upper lip seal (1055) with the opening pointing away from
the bearing.
Explosion-proof mixers have mechanical shaft seal
instead of lip seal.
2. Press the rotor (1019) into the motor flange (1020).
Make sure the motor flange (1020) rotates freely.
Make sure that the rotor is positioned correctly.
Do not use a hammer.
3. Heat the bearing (1039) and fit it on the ND-end of the rotor
shaft.
If a bearing heater is used, the temperature must not
exceed 176 °F (80 °C).
Use a hydraulic press if a bearing heater is not
available.
4. Fit the seal washer (1173) on the water-in-oil sensor (1049)
and lubricate the washer and threads.
5. Fit the water-in-oil sensor (1049) in the motor flange (1020)
and tighten gently.
Keep the wires of the water-in-oil sensor away from
the bearing, for instance by means of a plastic strip.
6. Lubricate the groove for the O-ring (1022) on the motor side of
the motor flange.
7. Fit and lubricate the O-ring (1022).
8. Place the rotor with the motor flange upwards
9. Fit the lower lip seal (1054) with the opening upwards
(pointing away from the bearing). Tap gently, if needed.
10. Lubricate the groove for the O-ring (1022) on the gear side of
the motor flange (1020).
11. Fit and lubricate the O-ring (1022).
12. Insert the stator (1018) in the motor housing (1017).
Make sure that the fixation holes for alignment are
positioned correctly.
Make sure not to damage any wires.
AMG.20-55 [ANSI] and AMG.15-40 [DIN]
1. Fit the screw (1044) in the motor housing (1017) and tighten
gently.
2. Fit the spring washer (1045) and the nut (1158).
3. Tighten the nut (1158).
AMG.75-250 [ANSI] and AMG.55-185 [DIN]
1. Fit the screw (1044), seal washer (1056) and nut (1046).
All types
1. Lead the wires into the terminal box.
2. Place the motor housing (1017) in vertical position.
3. Fit the compensation disc (1038) in the ND-end of the motor
housing (1017).
4. Insert the rotor in the motor housing (1017).
Lead the wires of the water-in-oil sensor (1049) to the junction
box before the rotor is fully inserted.
5. Align the motor flange with the water-in-oil sensor pointing
away from the terminal box.
6. Fit and tighten the screws (1021) a little by hand.
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