3
‐
2 Maintenance & Troubleshooting
MN400
Table 3
‐
2 Service Conditions
Severity of Service
Hours per day
of Operation
Ambient Temperature
Maximum
Atmospheric
Contamination
Standard
8
40
°
C
Clean, Little Corrosion
Severe
16 Plus
50
°
C
Moderate dirt, Corrosion
Extreme
16 Plus
>50
°
C* or
Class H Insulation
Severe dirt, Abrasive dust, Corrosion, Heavy
Shock or Vibration
Low Temperature
<-29
°
C **
*
Special high temperature grease is recommended (Dow Corning DC44). Note that Dow Corning DC44 grease does
not mix with other grease types. Thoroughly clean bearing & cavity before adding grease.
**
Special low temperature grease is recommended (Aeroshell 7).
Table 3
‐
3 Relubrication Interval Multiplier
Severity of Service
Multiplier
Standard
1.0
Severe
0.5
Extreme
0.1
Low Temperature
1.0
Some motor designs use different bearings on each motor end. This is normally indicated on the motor nameplate.
In this case, the larger bearing is installed on the motor Drive endplate. For best relubrication results, only use the
appropriate amount of grease for each bearing size (not the same for both).
Table 3
‐
4 Bearings Sizes and Types
Frame Size
NEMA (IEC)
Bearing Description
(These are the “Large” bearings (Shaft End) in each frame size)
Bearing
Weight of Grease to
add *
oz (Grams)
Volume of grease
to be added
in
3
teaspoon
56 to 140 (90)
6203
0.08 (2.4)
0.15
0.5
140 (90)
6205
0.15 (3.9)
0.2
0.8
180 (100-112)
6206
0.19 (5.0)
0.3
1.0
210 (132)
6307
0.30 (8.4)
0.6
2.0
250 (160)
6309
0.47 (12.5)
0.7
2.5
280 (180)
6311
0.61 (17)
1.2
3.9
320 (200)
6312
0.76 (20.1)
1.2
4.0
360 (225)
6313
0.81 (23)
1.5
5.2
400 (250)
6316
1.25 (33)
2.0
6.6
440 (280)
6319
2.12 (60)
4.1
13.4
5000 to 5800 (315-450)
6328
4.70 (130)
9.2
30.0
5000 to 5800 (315-450)
NU328
4.70 (130)
9.2
30.0
360 to 449 (225-280)
NU319
2.12 (60)
4.1
13.4
AC Induction Servo
76 Frame 180 (112)
6207
0.22 (6.1)
0.44
1.4
77 Frame 210 (132)
6210
0.32 (9.0)
0.64
2.1
80 Frame 250(160)
6213
0.49 (14.0)
0.99
3.3
*
Weight in grams = .005 DB
of grease to
be added
Note: Not all bearing sizes are listed. For intermediate bearing sizes, use the
grease volume for the next larger size bearing.
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