Taylor-Dunn B0-248-36 Operation, T Roubleshooting And Replacement Parts Manual page 107

7. Visually inspect the armature windings for burnt insulation. Burnt insulation is a direct result of
motor overheating and could lead to a shorted armature.
• If the insulation is cracked or burnt, then it is recommend that the armature or motor be
replaced.
NOTE: If the armature has been burnt then there is a good possibility that
the field windings may also be burnt. Symptoms indicating a shorted
field include high motor current, lack of power and possibly
excessive speed.
8. Using a growler, test the armature for shorts.
• If the armature is shorted, then we recommend that the armature or motor be replaced.
9. Using the continuity function of digital multi meter,
check the continuity around the entire commutator
by placing one test lead against one of the
commutator segments and the other test lead
against all of the other segments one at a time.
There should be continuity around the entire
commutator. If any segment indicates an open
circuit, then the motor must be replaced.
10. Using the continuity function of digital multi meter,
check the continuity from any one of the
commutator segments and the armature frame. If
it is not an open circuit, then the armature is shorted
and the motor must be replaced.
11. Measure the armature and field resistance (refer to
If the armature of field resistance is not within specification then the motor must be repaired or
replaced.
Check each segment
all of the way around
Commutator
Service Limits
Motor Page 5
Motor Service
Hold this lead
in place
the commutator
table at end of this section).