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Manual of Electric Motors
100
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Excess grease causes bearing overheating, resulting in bearing failure.
8.2.1. Grease lubricated rolling bearings
Table 8.1
- Lubrication intervals for ball bearings
Frame
Poles
Bearing
designation
Amount of
grease (g)
Lubrication intervals (hours)
ODP
(Open Drip Proof)
W21 TEFC
(Totally Enclosed Fan
Cooled)
W22 TEFC
(Totally Enclosed Fan
Cooled)
IEC
NEMA
50 Hz
60 Hz
50 Hz
60 Hz
50 Hz
60 Hz
90
143/5
2
6205
4
-
-
20000
20000
25000
25000
4
6
8
100
-
2
6206
5
-
-
20000
20000
25000
25000
4
6
8
112
182/4
2
6207/
6307
9
-
-
20000
20000
25000
25000
4
6
8
132
213/5
2
6308
11
-
-
20000
18400
25000
23200
4
20000
20000
25000
25000
6
8
160
254/6
2
6309
13
20000
20000
18100
15700
22000
20000
4
20000
20000
25000
25000
6
8
180
284/6
2
6311
18
20000
20000
13700
11500
17000
14000
4
20000
20000
25000
25000
6
8
200
324/6
2
6312
21
20000
20000
11900
9800
15000
12000
4
20000
20000
25000
25000
6
8
225
250
280
315
355
364/5
404/5
444/5
445/7
447/9
L447/9
504/5
5008
5010/11
586/7
588/9
2
6314
27
18000
14400
4500
3600
5000
4000
4
20000
20000
11600
9700
14000
12000
6
16400
14200
20000
17000
8
19700
17300
24000
20000
2
6316
34
14000
*Upon
request
3500
*Upon
request
4000
*Upon
request
4
20000
20000
10400
8500
13000
10000
6
14900
12800
18000
16000
8
18700
15900
20000
20000
2
6319
45
9600
*Upon
request
2400
*Upon
request
3000
*Upon
request
4
20000
20000
9000
7000
11000
8000
6
13000
11000
16000
13000
8
17400
14000
20000
17000
4
6322
60
20000
20000
7200
5100
9000
6000
6
10800
9200
13000
11000
8
15100
11800
19000
14000
The lubrication intervals specified in Table 8.1, Table 8.2, Table 8.3 and Table 8.4 consider an absolute
temperature on the bearing of 70 °C (up to frame size IEC 200 / NEMA 324/6) and 85 °C (for frame size IEC
225 / NEMA 364/5 and above), the motor running at rated speed, a motor mounted in horizontal position and
greased with Mobil Polyrex EM grease. Any variation of the parameters listed above must be evaluated.
Page 171
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