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Apr . 25, 2024 10:12 Back to list

Lubrication of Electric Motors


In servicing electric motor bearings, it is important
that the right grease be applied in the right quantity.
Both underlubrication and overlubrication are harmful.
Underlubrication will result in bearing failure through
inability of the insufficient amount of lubricant to perform
successfully any one of its functions. Excess grease in the
path of rotating parts offers high resistance to motion,
and overheating and high internal pressure will result.


Excessive leakage at bearing seals may occur.
The frequency of regreasing antifriction bearings of
electric motors is affected by the following factors:
• Quality of grease used, especially as to its service life
• Severity of service, including operating temperatures
• Cleanliness of surroundings
• Presence of water
• Continuity of service (may range from infrequent
operation to 24-hour-a-day operation)
• Bearing size
• Speed and housing design
In many applications, motor bearings are greased once a
year during routine inspection and maintenance work. In
general, large electric motors (greater than 40 hp) should
be greased more frequently, such as every six months.
Small motors operating under non-severe conditions and
using high-quality grease may not require regreasing for
periods of up to several years.
Relubrication Volume Formula
The amount of grease needed depends on bearing size.
Bearing manufacturers use a variety of formulas, but
experience has shown that the following works well:
Metric: Gq = 0.005 x D x W
Gq = Grease replenishment amount (gm)
D = Bearing outside diameter (mm)
W = Bearing width (mm)
English: G = 0.1 x D x W
G = Grease replenishment amount (oz)
D = Bearing outside diameter (in.)
W = Bearing width (in.)
To use this formula, you must know the size of the bearing
as well as how much each pump of the gun delivers.
Grease guns come in a variety of pump sizes, typically
dispensing 1 to 3 gm (0.03 to 0.1 oz) per stroke. We
suggest you pump grease into a small container of known
volume and count the number of strokes to fill it. From
this, you can figure the volume per stroke of the gun.
Ideally the following procedures should be followed when
regreasing electric motor bearings:
A. Bearing with fitting and relief plug
1. Stop the motor.* (If motor is stopped, use any
required lockout/tagout procedures.)
2. Wipe clean the pressure gun fittings and relief
plugs on the motor and the grease gun tip.
3. Remove the relief plug to avoid damaging the
bearing seals or forcing grease out along the motor
shaft.
4. Free the relief hole of any hard grease.
5. Put the gun on the fitting and pump the proper
calculated amount of grease into the bearing until
fresh grease comes out the hole.
6. Run the motor. The grease will come out of the
hole. Continue to run until the pressure is relieved.
Thirty minutes will be plenty of time

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