GEI M1010-A
© Copyright 2011 General Electric Company
9
E. Vacuum and Compressed Air Cleaning
Compressed air should be used to remove loose dirt and dust from air passages such as air ducts. Suction should be
used to remove dirt from the windings and to avoid damaging the coils.
CAUTION: Care must be taken to make sure the air is dry and that air pressure of not more than 21 x
10
3
kg/m
2
(30 psi) is used.
WARNING: Operator must not use compressed air to remove dirt or dust from his or her person and
clothing.
F. Cleaning with Water and Detergent
This method is very effective in cleaning windings when used with a low-pressure steam jenny maximum steam flow
30 psi and 90°C.
CAUTION: To minimize possible damage to varnish and insulation, a fairly neutral non-conductive
type of detergent such as DuBois Flow should be used. A pint of detergent to 76 liters (20 gallons) of
water is recommended.
If a steam jenny is not available, the cleaning solution may be applied with warm water by a spray gun. After the
cleaning operation, the windings should be rinsed with water or low-pressure steam.
Dry the windings. Refer to the Insulation Resistance section in IV A. above, for instructions on how to proceed.
G. Anti-Friction Bearings and Lubrication
The grease used as a lubricant in grease-lubricated anti-friction bearings does not lose its lubricating ability suddenly,
but over a period of time. For a given bearing construction and assembly, the lubricating ability of a grease over time
depends primarily on the type of grease, the size of the bearing, the speed at which the bearing rotates and the
severity of operating conditions. As a result, it is not possible to accurately predetermine when new grease must be
added. But, good results can be obtained if the general recommendations stated in this manual are followed.
The primary function of grease is to supply the essential lubrication oil from the sponge-like reservoir of its soap
structure. Grease-lubricated anti-friction bearings consume only a small amount of lubricant. This lubricant must
always be present to avoid rapid wear and bearing failure. However, excessive or too frequent lubrication may also
damage the motor.
Ball bearing motors are adequately lubricated at the factory. Motors with grease fittings should be lubricated in
accordance with these instructions to provide maximum bearing life.
To obtain optimum results, Exxon Mobil Polyrex EM (General Electric Specification D6A2C23) polyurea grease should
be used for lubrication, unless special grease is specified on the motor’s nameplate.
See Section XI Lubrication Guide for greasing frequency and recommended quantity of grease. If in doubt, refer to GE
Energy.
CAUTION: Failure to use polyurea base (NLGI Grade 2) or known compatible grease could result in
premature bearing failure.
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