Taylor-Dunn E-455, Service And Replacement Parts Manual

Page: 72 / 134

Motor SEM
Page 72
E-455
ME-455-04
Inspect the armature windings where they loop back at
the opposite end of the commutator.
• If the windings show indications of expanding (see
illustration), then the motor has been operated at
excessive RPM and the armature or motor must
be replaced.
• If the armature windings expanded enough to
contact the field, then it is likely that the motor
controller has bee damaged.
Using a growler, test the armature for shorts.
• If the armature is shorted, then it is recommend
that the armature or motor be replaced.
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.
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.
Measure the armature resistance (refer to Service Limits
table at end of this section).
• If not within specification then the motor must be
repaired or replaced.
Field Windings
Measure the field resistance (refer to Service Limits table
at end of this section).
• If not within specification then the motor must be
repaired or replaced.