PROCESSING ELECTRICAL EQUIPMENT

TM 38-260

4-21. PROCESSING ELECTRICAL EQUIPMENT

WARNING

MAKE SURE THE SOURCE OF ELECTRICAL POWER IS DISCONNECTED BEFORE

ANY WORK IS PERFORMED ON THE ELECTRICAL SYSTEM. .

a. Process electrical equipment only after the parent machine has been processed, timed

and aligned.

b. When the removal of electrical assemblies is necessary in the processing of the parent machine, avoid

unnecessary disassembly that may have to be repeated until after timing and alignment of the machine.

c. Disconnect control wires at the terminals, they should never be cut. Tag or otherwise identify the disconnected

terminal ends to show the terminal block or junction box numbers.

d. Disconnect bus bars at terminal ends only.

e. Employ only experienced electricians or electrical maintenance personnel for the processing of electrical

assemblies.

f. To eliminate expensive delays in research at the time of reactivation, wiring diagrams and operator's manuals of

assemblies which are to be separated from the parent machine for shipping or storage purposes shall be placed in an

envelope, identified with the basic machine, and enclosed within the control panel or with the packing slip and allied

papers.

g. Due to the differences in design and fabrication of the various items of electrical equipment such as recorders,

motors, and instruments, they have been broken down into separate categories with respect to cleaning and preservation

and are covered in subsequent paragraphs.

4-22. ELECTRIC MOTORS AND GENERATORS

a. General. The extent of and procedures to be employed in the cleaning of motors and generators depend upon

the degree of contamination. For the purpose of this section, the word "motor" will refer to both motors and generators

unless specifically stated otherwise. Manufacturer instructions, if available, should be followed. Totally enclosed motors

will rarely require internal cleaning. An open or semi-open motor which, upon inspection, is found to have the interior of

the motor contaminated with oily motor lint, sludge, or other deposits shall be disassembled to the degree necessary to

accomplish a thorough cleaning. When it is necessary to disassemble a motor, care should be exercised so as not to

drag the rotor across the windings. Heavy rotors should be handled with a sling. When removing the armature from a

direct current motor, the armature should always be supported or lifted by its shaft. If this is impossible, a wide lifting belt

may be used around the armature. Care must be taken not to allow the weight of the armature shaft to rest on the

commutator or coils. After removal, the armature shaft should be supported in a frame or between V-blocks in such a

manner that the armature will not touch the

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