14108242 Installation, operation and maintenance manual – Squirrel cage motor – WGM20 Line l 41
7.10.9.5
Bearing assembly
Clean the bearings completely and inspect the
disassembled parts and the inside of the bearing caps;
Make sure the rolling bearing, shaft and bearing cap
surfaces are perfectly smooth;
Fill up to ¾ of the inner and outer bearing cap deposits
with the recommended grease (Figure 7.10) and
lubricate the rolling bearing with enough grease before
assembling it;
Before assembling the rolling bearing on the shaft, heat
it up to a temperature between 50 ºC and 100 ºC;
For the complete assembly of the bearing, follow the
disassembly instructions in the reverse order.
Figure 7.10: External bearing cap
7.10.9.6
Bearing insulation
The motor has insulated NDE end shield and shaft
grounding brush to prevent the passage of electric current
through the bearings.
To replace these parts, it is recommended to use original
parts.
7.10.10
Rolling bearing replacement
The disassembly of rolling bearings must be done with an
appropriate tool (rolling bearing puller).
The arms of the puller must be placed on the lateral
surface of the bearing inner ring to be disassembled or on
an adjacent part.
Figure 7.11: Tool for rolling bearing extraction
7.10.11
Bearing protection
7.10.11.1
Protection settings
ATTENTION
The following temperatures must be set on
the bearing protection system:
Alarm 110 ºC – Trip 120 ºC
The alarm temperature must be set 10 ºC
above the operating temperature, not
exceeding the limit of 110 ºC.
