3-64. TRACTION MOTOR ASSEMBLY (cont)
36. Perform armature and stator megohmmeter test by the following:
a. Armature test.
A minimum of 500 V at 1 megohm is required for this test.
(1) Place lead (1) of megohmmeter (2) on shaft or core of the armature.
(2) Place lead (3) of megohmmeter (2) on one of the commutator bars. Note indication on megohmmeter. Contact
each successive bar around the commutator.
Procedures specify the heating of parts to aid in disassembly and assembly. Heated parts may
cause injury to personnel if hand protection is not worn when handling. Wear protective gloves for
(3) If an indication of less than 3 megohms is obtained, bake armature for 4 hours at 230
°F in a convection oven.
Recheck after cooling armature to room temperature. If the indication is still low, replace the armature.