Lubrication of electric motor bearing

1. ELECTRIC MOTOR BEARING
LUBRICATION
BY: AUNG KHAING HTUN
LUBE ENGINEER

2. AIM
• To understand how the proper lubrication of electric motor bearing is
essential.
• To know how to choose right electric motor grease
• To know the correct procedure greasing the motor bearing

3. Guide to electric motor bearing lubrication
• Grease Lubrication
• Choosing right electric motor grease
• Adding grease to electric motor bearings

4. Grease Lubrication
• reduce friction and wear
• protect bearings against corrosion
• act as a seal to prevent entry of contaminants
POLYUREA

5. Choosing right electric motor grease
• Viscosity
• Consistency
• Oxidation resistance
• Anti-wear
• Dropping point
• Shear stability

6. Adding grease to electric motor bearings
Right time
Right amount
Right way

7. • Speed
• Temperature
For each 10°C above 65°C
Interval Should be Reduced by Half
• Size
Motor Size Grease Interval
Up to 75 HP Yearly
75 to 250 HP 6 Months
Above 250 HP 2 Months
Right time

8. Right time

9. Right Amount
• Only the grease in the bearing
should be replaced:
G = .114 x D x B
G = Grease ounces
• D = OD inches
• B = Width inches
Translate to gun strokes by
calibrating gun for
strokes/ounce

10. Right Amount
- Grease Gun Calibration Check -

11. Right Amount

12. Right Amount

13. Right Way
• Remove drain plug, clean old grease
from drain opening
• Clean pressure fitting, grease gun
nozzle
• Pump specified amount of grease
into fitting
• Run machine until rotating parts
expel excess, temperature
normalizes (± 10 minutes)
• Replace drain plug

14. Right Way
Industrial Best Practice

15. Right Way
Industrial Best Practice

16. TIPs