Page 3-25
Maintenance 3.18 - Electric Motor
MX15/19
tor cover.
7. The stator assembly must be placed in a definite relationship with the commutator covers in
order to obtain a neutral brush setting. There is a matchmark on both items. These two
marks must line up exactly. Rotate until they do.
8. Assemble the pulley end cover in the proper relationship. Insert mounting bolts and tighten
alternately to ensure a good mechanical alignment.
9. Spin the shaft by hand to see if it is free. Be sure motor leads (if used) are not touching
together. If the leads are touching, a generator action will give the effect of friction in the
motor. A no-load test can now be performed. At rated voltage, observe the no-load current. It
should be less than 20% of the nameplate full load current. Anything higher indicates:
• Brushes are not on neutral setting (check matchmarks for exact alignment).
• Faulty armature.
Figure 3-25:
Electric Motor
DC
Power
Supply
V
A
Voltage Meter
Ammeter
Brushes and
springs in their
final position
Brushes raised with
the springs in locked
position on the side
of the brush
A
B
C
Keep fingers
clear of this
space.
DC
Motor
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