ELECTRIC MOTORS AND GENERATORS

TM 38-260

floor or table. Under no condition should the armature ever be rolled upon the floor or work bench.

b. Cleaning procedures. The procedures to be used in cleaning electric motors are as follows:

(1) When the motor is small and all surfaces are accessible, remove all contaminants with a clean dry cloth.

Cloth waste should not be used for this purpose.

(2) Blow out dirt with a jet of compressed air. This is particularly effective when the dirt has collected in places

which cannot be reached with the cloth. Cleaning may be done more quickly with compressed air than with a cloth,

especially on large motors. When using compressed air, do not blow the air against insulation until it is certain that the

air is dry and does not carry water which may have condensed and accumulated in the air line. Do not use air pressure

greater than 30 PSI, (206(KPA)) as high pressures may damage insulation. Do not direct the stream of compressed air

in such a way that dirt will be difficult to remove and where it might close ventilating ducts.

WARNING

PERSONNEL USING COMPRESSED

AIR

FOR

CLEANING

SHALL

WEAR

APPROPRIATE EYE. PROTECTION.

(3) Loose dirt and dust may be removed by the use of a vacuum cleaner.

(4) Oil or grease shall be removed by cleaning with dry cleaning solvent.

CAUTION

USE WITH ADEQUATE VENTILATION. AVOID PROLONGED OR REPEATED BRE-

ATHING OF VAPOR OR CONTACT WITH SKIN. DO NOT TAKE INTERNALLY.

NOTE

SOLVENTS SHALL NOT BE USED FOR CLEANING SILICONE TREATED WINDINGS AS

THE SOLVENT WILL DISSOLVE THE VARNISH COATINGS.

(5) Verdigris and other corrosion deposits on metal surfaces may be removed with crocus cloth, wood scraper,

or other suitable methods not injurious to the part affected. Do not use abrasives for cleaning plated surfaces.

c. Preservation. Component parts and surfaces of electric motors shall be preserved as follows:

(1) Bearings. Sealed (anti-friction) bearings require no preservation, but will need to be replaced if defective.

Open type (exposed) bearings shall be preserved with either preservative grease conforming to MIL-G-23827 P-11 or

preservative oil conforming to MIL-L-21260 P- 10, grade 30, as applicable.

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