Lubricating Procedure; Replacing The Motor; Disassembly; Assembly - Grundfos CR Serie Instrucciones De Instalación Y Operación

12.5 Lubricating procedure

Keep grease free from dirt to avoid damage to
motor bearings. If the environment is extremely
dirty, contact Grundfos, the motor manufacturer,
Caution
or an authorized service center for additional
information.
Do not mix dissimilar types of grease.
1. Clean all grease zerks. If the motor does not have grease
zerks, the bearing is sealed and cannot be greased externally.
2. If the motor is equipped with a grease outlet plug, remove it.
This will allow the old grease to be displaced by the new
grease. If the motor is stopped, add the recommended
amount of grease. If the motor is to be lubricated while
running, add a slightly greater quantity of grease.
3. Add grease SLOWLY taking approximately one minute until
new grease appears at the shaft hole in the flange or grease
outlet plug. Never add more than 1 1/2 times the amount of
grease shown in the lubricating chart.
If new grease does not appear at the shaft hole or
grease outlet, the outlet passage may be blocked.
Note
Note
Contact Grundfos service center or certified
motor shop.
4. Let motors equipped with a grease outlet plug run for
20 minutes before replacing the plug.

13. Replacing the motor

Motors used on CR pumps are specifically
selected to our rigid specifications.
Replacement motors must be of the same frame
Caution
size, should be equipped with the same or better
bearings and have the same service factor.
Failure to follow these recommendations may
result in premature motor failure.
If the motor is damaged due to bearing failure, burning or
electrical failure, observe the following instructions as to how to
remove the motor and how to mount the replacement motor.
Warning
Before starting work on the motor, make sure that
the mains switch has been switched off. It must
be ensured that the power supply cannot be
accidentally switched on.
20

13.1 Disassembly

Proceed as follows:
1. Disconnect the power supply leads from the motor.
Remove the coupling guards.
For CR 1s, 1, 3, 5, 10, 15, and 20: Do not loosen
Note
Note
the three hexagon socket head cap screws
securing the shaft seal.
2. Use the proper metric hexagon key to loosen the four cap
screws in the coupling. Remove coupling halves completely.
On CR 1s-CR 20, the shaft pin can be left in the pump shaft.
CR, CRN 32, 45, 64, 90, 120, and 150 do not have a shaft pin.
3. Use the correct size spanner to loosen and remove the four
mounting bolts joining motor and pump.
4. Lift the motor straight up until the shaft has cleared the motor
stool.

13.2 Assembly

Proceed as follows:
1. Remove key from motor shaft, if present, and discard.
2. Thoroughly clean the surfaces of the motor and pump
mounting flanges. The motor and shaft must be clean of all oil
or grease and other contaminants where the coupling
attaches. Place the motor on top of the pump.
3. Turn the terminal box to the desired position by rotating the
motor.
4. Insert the four mounting bolts, then tighten diagonally and
evenly:
– for 3/8" bolts (1/2 - 2 hp), torque = 17 ft-lb
– for 1/2" bolts (3 - 40 hp), torque = 30 ft-lb
– for 5/8" bolts (50 - 100 hp), torque = 59 ft-lb
– follow instructions for particular pump model in sections
to
13.2.2 CR 1s, 1, 3, and 5
120, and 150.

13.2.1 Torque specifications

Torque specifications for CR, CRI, CRN 1s, 1, 3, 5, 10, 15,
and 20 CRT 2, 4, 8, and 16
Coupling screw size
M6
M8
M10
13.2.5 CR, CRN 32, 45, 64, 90,
Minimum torque
10 ft-lb
23 ft-lb
46 ft-lb