Testing - TM-5-6115-440-340025

between bars as this could give an indication

d. Testing.

of a shorted condition.

(1) Equipment. Use a 110 volt lamp connected

in series with test leads and a 110 volt power source

(3) S t a t o r a s s e m b l y . T e s t f i e l d c o i l s f o r

for checking continuity in armature and stator

grounds by touching one test lead to stator core and

assembly. A proper size "growler" should be used

other test lead to each of the field leads. If the lamp

for checking armature for open or short circuits.

lights, the field is grounded and the entire stator

(2) Armature. Test armature for grounds by

must be replaced. Using an ohmmeter, check field

touching one test lead to core laminations and other

coils for resistance (fig. 3-11) connect one test lead

test lead to each of the commutator risers. If the

of ohmmeter circuit to terminal "A" and the other

lamp lights, the windings are grounded and ar-

test lead to terminal "D"; the resistance between

mature must be replaced. If the "growler" test

these two terminals should be from 2.0 to 2.3 ohms.

indicates either open or short circuits, the armature

Resistance valves outside these limits indicate

must be replaced.

faulty circuitry. If the conditions require extensive

repairing the stator assembly must be replaced.

NOTE

Make certain that commutator is free of

m e t a l l i c particles and carbon dust wedged

3-13