English (US)
20
12.5 Lubricating procedure
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.
4. Let motors equipped with a grease outlet plug run for
20 minutes before replacing the plug.
13. Replacing the motor
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.
13.1 Disassembly
Proceed as follows:
1. Disconnect the power supply leads from the motor.
Remove the coupling guards.
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
13.2.2 CR 1s, 1, 3, and 5 to 13.2.5 CR, CRN 32, 45, 64, 90,
120, and 150.
13.2.1 Torque specifications
Keep grease free from dirt to avoid damage to
motor bearings. If the environment is extremely
dirty, contact Grundfos, the motor manufacturer,
or an authorized service center for additional
information.
Do not mix dissimilar types of grease.
If new grease does not appear at the shaft hole or
grease outlet, the outlet passage may be blocked.
Contact Grundfos service center or certified
motor shop.
Motors used on CR pumps are specifically
selected to our rigid specifications.
Replacement motors must be of the same frame
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.
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.
For CR 1s, 1, 3, 5, 10, 15, and 20: Do not loosen
the three hexagon socket head cap screws
securing the shaft seal.
Torque specifications for CR, CRI, CRN 1s, 1, 3, 5, 10, 15,
and 20 CRT 2, 4, 8, and 16
Coupling screw size Minimum torque
M6 10 ft-lb
M8 23 ft-lb
M10 46 ft-lb
To Next Page
Loading...
Need help?
General
