ELECTRIC MOTOR BEARING LUBRICATION

BY: AUNG KHAING HTUN LUBE ENGINEER

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

Guide to electric motor bearing lubrication

• Grease Lubrication

• Choosing right electric motor grease

• Adding grease to electric motor bearings

Grease Lubrication

• reduce friction and wear• protect bearings against corrosion• act as a seal to prevent entry of contaminants

POLYUREAMobil Polyrex EMMobilith SHC 100

Choosing right electric motor grease

• Viscosity• Consistency• Oxidation resistance• Anti-wear• Dropping point• Shear stability

Adding grease to electric motor bearings

Right time

Right amount

Right way

• Speed

• Temperature

For each 10°C above 65°C Interval Should be Reduced by Half

• Size

Motor Size Grease Interval Up to 75 HP Yearly75 to 250 HP 6 Months Above 250 HP 2 Months

Right time

Right time

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

Right Amount- Grease Gun Calibration Check -

Right Amount

Right Amount

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

Right WayIndustrial Best Practice

Right WayIndustrial Best Practice

TIPs

THANKS FOR YOUR ATTENTION