26
Dimension
Inner dia.
70
75
80
85
90
95
100
105
110
120
60
65
70
70
75
80
85
90
95
100
105
110
120
8-4) Maintenance of motor bearing
Following instractions apply when using
SUMITOMO standard 3-phase motor
.
Refer to the relevant instruction manual when using
motors with brake
,
servomotors
and
motors made by other
companies .
Bearing types and maintenance methods vary according to the frame sizes of the unit.
Choose the proper maintenance method by checking the nameplate and the bearing type in Table 25.
Table 25 Bearing type
Maintenance of sealed bearing
Since sealed-type bearing is filled with high quality grease from the factory, it is not necessary to replenish grease at the
initial operation. Under normal operation, exchanging bearing once every three-five years or every 20,000 hrs at
disassembly or maintenance is recommended for reliable operation.
Maintenance of open bearing
(1) Grease replenishing time and quantity
Checking the bearing number in the nameplate, replenish grease in according to Table 26.
Table 26 Grease maintenance schedule
Bearing type
Sealed bearing
Open bearing
Applicable motor (frame size)
Loading side
225 or smaller
250
Opposite of loading side
All
Remarks
No construction for supplying and draining grease
With grease nipple and drain plug
• Use CM class bearings
• Use "MULTEMP SRL (Kyodo Yushi) lubricants"
• Under severe usage conditions, change bearing more frequently.
• When using forced ventilating motor, replacement of cooling fan every 15,000 hrs running is
recommended because the bearing life of fan motor is 15,000 to 20,000 hrs.
Bearing No.
6314
6315
6316
6317
6318
6319
6320
6321
6322
6324
6412
6413
6414
NU314
NU315
NU316
NU317
NU318
NU319
NU320
NU321
NU322
NU324
Outer dia.
150
160
170
180
190
200
215
225
240
260
150
160
180
150
160
170
180
190
200
215
225
240
260
Width
35
37
39
41
43
45
47
49
50
55
35
37
42
35
37
39
41
43
45
47
49
50
55
Initial quantity
(gram)
200
230
260
300
350
400
450
500
550
700
200
230
300
120
150
200
250
300
350
400
450
500
650
Replenishing
quantity
(gram)
40
45
50
55
60
65
70
75
80
100
40
45
55
40
45
50
55
60
65
70
75
80
100
750r/min
8500
8500
8000
7500
7000
7000
6500
6000
6000
5500
8500
8000
8000
4000
4000
4000
3500
3500
3500
3000
3000
3000
2500
900r/min
7000
6500
6500
6000
5500
5500
5000
5000
4500
4000
7000
6500
6500
3500
3000
3000
3000
2500
2500
2500
2500
2000
2000
1000r/min
6000
6000
5500
5000
5000
4500
4500
4000
4000
3500
6000
6000
5500
3000
3000
2500
2500
2500
2000
2000
2000
2000
1500
1200r/min
5000
4500
4500
4000
4000
3500
3500
3000
3000
2500
5000
4500
4500
2500
2000
2000
2000
2000
1500
1500
1500
1500
1000
1500r/min
3500
3500
3000
3000
2500
2500
2000
2000
2000
1500
3500
3500
3000
1500
1500
1500
1500
1000
1000
1000
1000
1000
1800r/min
2500
2500
2500
2000
2000
1500
1500
1500
1000
1000
3000
2500
2500
1000
1000
1000
1000
1000
Replenishing time (interval corresponding to rotation speed r/min)
•
Initial quantity shows replenished quantity after disassembling and cleaning the bearings. Supply about 1/3
of the quantity to inside of the bearing and the rest of it to inner space.
•
Replenishing quantity indicates grease amount poured into the bearing every interval.
•
Even though the bearing is run with intermittent operation, replenish grease at least every three years.
•
Replenish grease right after starting operation after a long shut down.
•
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