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8. Daily Inspection and Maintenance
8-6 Motor Bearing Maintenance
Bearing type and maintenance technique will vary according to motor frame size. When maintaining, confirm the bearing type by
referring to the nameplate and Table 8-14.
When using a vector motor, other manufacturer’s motor (There are some models made by other manufacture.), refer to the operation
manual for that motor.
Table 8-14 Bearing Types
Bearing type
- Specified motor (frame size)
Remarks
Load side
Anti-load side
Sealed bearing
- Motor frame size 160 and lower
- Motor frame size 180 and higher, at the same
time Cyclo frame size 6225 and lower
All motors except the following.
Not constructed for
filling or draining
grease
Open bearing
- Motor frame size 180 and higher, at the same
time Cyclo frame size 6235 and higher
- Motor frame size F-200L (increased safety,
explosion proof),
at the same time
Cyclo
frame size 6255 and 6265
With grease fitting
and grease discharge
plug
(1) Sealed Bearing Maintenance
Although it will depend on operation conditions, maintenance with disassembly after approximately 20,000 hours or 3 to 5 years will
further increase lifetime.
Contact the nearest authorized service station regarding maintenance with disassembly.
(2) Open Bearing Maintenance
Check the bearing number on the nameplate, and replenish grease in accordance with with Table 8-15.
Table 8-15 Open Bearing Grease Replenishment Intervals and Replenishment Quantity
Bearing number
Replenishment
quantity (g)
Grease replenishment interval (interval (h) for speeds (r/min))
720 r/min
870 r/min
980 r/min
1165 r/min
1450 r/min
1750 r/min
NU314
40
4000
3500
3000
2500
1500
1000
NU315
45
4000
3000
3000
2000
1500
1000
NU316
50
4000
3000
2500
2000
1500
1000
NU317
55
3500
3000
2500
2000
1500
1000
NU318
60
3500
2500
2500
2000
1000
1000
21312
30
1500
1000
1000
800
-
-
-The replenishment quantity is the quantity to insert at each interval.
-Even in the case of intermittent operation, replenish grease approximately every 3 years.
-If the machine is rested for a long time, replenish grease immediately after resuming operation.
(3) Recommended Grease for Open Bearings
Table 8-16 Recommended Grease
Ambient temperature
℃
Open Bearing
Thermal class 130 (B)
Thermal class 155 (F)
Mobil
Shell
−10 to 40
UNIREX N2
Shell Stamina Grease RL2
Avoid using grease other than that listed in Table 8-16.
