Yale MPB040-E, Manual

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Traction Motor
DISASSEMBLE
1. Remove the traction motor and brake assembly
from the MDU. See
Brakes 1800YRM1005.
CAUTION
The pinion end cover and the armature are heavy
components. Work carefully so the field coils,
pole pieces, and armature are not damaged dur-
ing disassembly and assembly.
2. Clean outside surfaces of motor before disassem-
bly. Make index marks on the ends of the motor
and field ring to ensure proper reassembly.
3. Remove brush cover, if used. Measure the brush
in the brush holder, use a tire tread depth gauge
or small scale to measure from the top of the
brush holder to the back of the brush.
a. Brush replacement is REQUIRED when the
height of the brush measures 11 mm (0.44 in.)
below the brush box. If the brush is worn
8 mm (0.31 in.) below the brush box, then
brush replacement is RECOMMENDED . See
the section DC Motor Maintenance
0620YRM0294 for the replacement of brushes
and spring assemblies.
4. Remove capscrews from commutator end of mo-
tor. Carefully slide end cover from motor and ar-
mature shaft.
DO NOT damage parts. A puller is
often necessary to separate the end cover from
the field ring.
5. Remove screws that fasten pinion end cover to
field ring. Remove end cover and armature. Use a
plastic or rubber hammer, as necessary, to loosen
end cover.
6. Remove pinion end cover from armature.
7. Remove screws that fasten brush holder assem-
bly to commutator end cover.
8. Disassemble components of motor, as necessary,
to make repairs. See Figure 17 and the section
DC Motor Maintenance 0620YRM0294.
Traction Motor 2200 YRM 1007
26