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6. Dismantling and assembly
6.1 General information
Position numbers
Position numbers of parts (digits) refer to drawings in section
8. Exploded views. Position numbers of tools (letters) refer to
section 5. Service tools.
Before dismantling
•
Disconnect the electricity supply to the motor.
•
Close the isolating valves, if fitted, to avoid draining the
system.
•
Remove the electric cable in accordance with local
regulations.
•
Note the centre of gravity of the pump to prevent it from
overturning. This is especially important in the case of long
pumps.
Before assembly
Gaskets and O-rings should always be replaced when the pump
is overhauled.
•
Clean and check all parts.
•
Order the necessary service kits.
•
Replace defective parts with new parts.
During assembly
Before assembly, clean and check all parts. Parts that are
defective should be replaced by new parts.
Lubricate and tighten screws and nuts to the torque stated.
See section 4. Torques and lubricants.
The Grundfos centrifugal pumps, types CR, CRN 32, 45, 64 and
90, are multi-stage in-line pumps.
Position numbers, see sections 7. Positions and 5. Service tools.
Order the necessary service kits.
Gaskets and O-rings should always be replaced when the pump
is overhauled.
6.2 Replacement of motor
6.2.1 Dismantling
Remove the screws (pos. 7a) and the coupling guards (pos. 7).
Keep the shaft seal in position on the shaft by inserting the
adjusting fork (pos. D) between the shaft seal (pos. 105) and the
seal carrier (pos. 58). See fig. 2.
D
Shaft seal
Fig. 2
Remove the screws (pos. 9) and the coupling (pos. 10a).
Remove the screws (pos. 28) and the nuts (pos. 29).
Carefully lift the motor free of the pump using lifting equipment
suitable for the motor size.
10
105
58
6.2.2 Assembly
Before assembly, clean all parts.
Fit the motor, and turn it to the required terminal box position.
Lubricate the screws (pos. 28) with Thread-Eze. Fit and cross-
tighten them to the torque stated. See section 4. Torques and
lubricants.
Before fitting the coupling, check that the adjusting fork (pos. D)
is still inserted between the shaft seal (pos. 105) and the seal
carrier (pos. 58).
Fit the coupling (pos. 10a) on the shaft so that the top of the
pump shaft is flush with the bottom of the coupling. See fig. 3.
Coupling
Fig. 3
Lubricate the hexagon socket head cap screws (pos. 9). Fit the
screws by hand and leave loose.
Check that the gaps either side of the coupling halves are
identical.
Tighten the hexagon socket head cap screws (pos. 9) two and
two (one side at a time). See section 4. Torques and lubricants.
Pull the adjusting fork (pos. D) free of the shaft, turn it and press it
on to one of the screws (pos. 58a).
Fit the coupling guards (pos. 7), and fasten them with the screws
(pos. 7a).
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