Motor Maintenance
PELLERIN MILNOR CORPORATION
Table 1: Standard Interval
Interval in Hours for the Given RPM
NEMA (IEC)**
Range of Frame Codes
3600 RPM*
1800 RPM*
1200 RPM*
900 RPM*
Up to 215 (132)
5500
12000
18000
22000
254 to 286 (160 - 180)
3600
9500
15000
18000
324 to 365 (200 - 225)
2200
7400
12000
15000
6313 or 6314
bearings
2200
3500
7400
10500
404 to 5000
(280 - 315)
Roller bearings
1100
1750
3700
5250
* Use this column if this is near or the same RPM as your motor.
** Frame codes given by the IEC are shown in parentheses.
Table 2: Operation Condition and Multiplication Number
Operation Conditions*
Maximum
Ambient
Temperature
Or Atmospheric
Contamination
Or Bearing Type
Rating
Multiplication
Number
104°F (40°C)
Clean, not much
corrosion
Ball bearing with
a groove of large
depth
Typical
1.0
122°F (50°C)
Moderate dirt,
corrosion
Ball thrust, roller
Bad
0.5
>122°F
(>50°C)
Much dirt, abrasive
dust, corrosion
n.a.
Very bad
0.1
* The worst condition sets the rating.
Table 3: Grease Quantity (total quantity for all bearings in the motor)
Largest Bearing Dimension in
Range
Quantity of Grease *
NEMA (IEC)
Range of Frame Codes
Category
of Bearing
Outer
Diameter
(mm)
Width
(mm)
(Ounces)
(Grams)
Cycles
of the
Grease
Gun
0 thru 215 (132)
6307
80
21
0.16
4.7
2.5
254 to 286 (160 - 180)
6311
120
29
0.32
9.1
5
324 to 365 (200 - 225)
6313
140
33
0.43
12.2
7
404 to 5000 (280 - 315)
NU322
240
50
1.11
31.5
18
* This is the quantity for the two bearings.
43
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