Motor Preventive Maintenance
PELLERIN MILNOR CORPORATION
Table 3: Determining Grease Quantity (total for all bearings in the motor)
Largest Bearing Size in Range Grease Volume if
Largest Bearing
Size**
NEMA (IEC)
Frame Size Range
Bearing
Category
Outside
Diameter
(mm)
Width
(mm)
(ounces) (grams)
Grease
Gun
Strokes*
Up to 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
* Based on .0624 fluid ounces (1.77 grams) per stroke. To check your grease gun, pump
grease into a small measured container. 16 strokes should provide 1 ounce (28 grams).
** This is the quantity for the motor (both bearings). Reduce grease quantity
proportionately for smaller bearings.
3. Grease Types and Application Procedures
Table 4: Grease Type Based on Severity of Service
Rating from Table 2 Grease Type
Standard
Severe
Shell Dolium R, Chevron SRI, or equivalent
Extreme Darmex 707 or equivalent
CAUTION 2 : Damage and Malfunction Risks—Poor greasing procedures such as
introducing contamination or forcing grease into motor windings can damage the motor.
Allowing grease to drip onto components such as brake or clutch surfaces can cause the machine
to malfunction.
• Clean grease fittings before greasing.
• Apply proper grease quantity.
• Use only a hand-operated (not a pneumatic) grease gun and pump grease slowly (10
seconds per stroke or slower).
• Keep machinery clean.
Apply grease as follows:
1. Lockout/tagout machine power at the external disconnect switch.
2. Clean grease fittings.
3. If the motor has a grease outlet plug, remove it.
4. Add recommended amount of grease. Stop immediately if new grease appears around motor
shaft or grease outlet plug.
5. If the motor has a grease outlet plug, replace it.
— End of BIUUUM03 —
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