Milnor MCR12E5 - Page 36

Motor Preventive Maintenance
PELLERIN MILNOR CORPORATION
12,000 x 0.5 = 6,000 hours
Where:
12,000 is the standard lubrication interval
0.5 is the severity of service multiplier
5. Determine from Table 3, the amount of grease to apply to the motor bearings, based on the
frame size range. Adjust for a smaller bearing size if necessary. Example based on above:
Grease volume = 0.16 ounces (4.7 grams)
Grease gun strokes = 2.5
Figure 1: Typical Motor Data Plate
Table 1: Lubrication Interval for Standard Severity of Service
Same or Closest Higher RPM Rating
NEMA (IEC)
Frame Size Range
3600 RPM 1800 RPM 1200 RPM 900 RPM
Up to 215 (132) 5500 hours 12000 hours 18000 hours 22000 hours
254 to 286 (160 - 180) 3600 hours 9500 hours 15000 hours 18000 hours
324 to 365 (200 - 225) 2200 hours 7400 hours 12000 hours 15000 hours
6313 or 6314 bearings 2200 hours 3500 hours 7400 hours 10500 hours
404 to 5000
(280 - 315)
roller bearings 1100 hours 1750 hours 3700 hours 5250 hours
Table 2: Determining the Service Severity Rating and Multiplier
Considerations (any non-"Standard" condition raises rating)
Maximum Ambient
Temperature
Or Atmospheric
Contamination
Or Bearing Type
Service
Severity
Rating
Multiplier
104°F (40°C) Clean, little corrosion Deep groove ball Standard 1.0
122°F (50°C) Moderate dirt, corrosion Ball thrust, roller Severe 0.5
>122°F (>50°C)
Much dirt, abrasive
dust, corrosion
n.a. Extreme 0.1