WEG S Series - Bearing Assembly; Oil-Lubricated Rolling Bearing; Lubrication Instructions; Oil Change

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44 l Installation, Operation and Maintenance Manual – Synchronous Motors – S Line – Brushless – Horizontal 11866576
7.10.1.7 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 7.3) 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 7.3: Outer bearing cap
A
TTENTION
When the bearing is opened, inject the new
grease through the grease nipple to expel the
old grease found in the grease inlet tube, and
apply the new grease in the rolling bearing, to
the inner and outer rings, filling 3/4 of the empty
spaces, as shown in Figure 7.3. In case of
double bearings (ball bearing + roller bearing),
also fill 3/4 of the empty spaces between the
intermediate rings;
Never clean the rolling bearing with cotton-
based cloths, because they leave some lint,
working as solid particles.
NOTE
WEG is not liable for the change of grease or for
any damages arising from this change.
7.10.2 Oil-lubricated rolling bearing
Figure 7.4: Oil-lubricated rolling bearing
Figure 7.4 legend:
1. Oil inlet
2. Oil sight glass
3. Oil outlet
7.10.2.1 Lubrication instructions
Oil drainage: When it is necessary to change the bearing
oil, remove the oil outlet plug (3) and drain the oil
completely.
To fill the bearing with oil:
 Close the oil outlet with the plug (3);
 Remove the oil inlet plug (1);
 Fill it with the specified oil up to the level indicated in the
oil sight glass.
NOTES
1. All threaded holes that are not used must
be closed with plugs and no fitting may
present leaks;
2. The oil level is reached when the lubricant
can be seen approximately in the middle of
the sight glass;
3. The use of excessive amount of oil will not
damage the bearing; but it can cause leaks
through the shaft seals;
4. Never use hydraulic oil or mix it with the
bearing lubricant oil.
7.10.2.2 Oil type
The type and quantity of the lubricant oil to be used are
specified on the nameplate affixed to the motor.
7.10.2.3 Oil change
The bearing oil change must be done according to the
intervals, which depend on the bearing operating
temperatures, shown in Table 7.4:
Table 7.4: Oil change intervals
Bearing operating
temperature
Bearing oil change
intervals
Below 75 ºC 20,000 hours
Between 75 and 80 ºC 16,000 hours
Between 80 and 85 ºC 12,000 hours
Between 85 and 90 ºC 8,000 hours
Between 90 and 95 ºC 6,000 hours
Between 95 and 100 ºC 4,000 hours