Model 8210/8250 Maintenance Manual Section 7. Component Procedures
Electrical Components DC Motors, General
Publication: 1146945/001, Revised: 25 Sep 2018 7-83
DC Motors, General
NOTE: For replacement parts information refer
to the Parts Manual.
Motor Brush Inspection
Figure 7-99. Motor Brush, Typical Location
Conduct a partial inspection of the motor after
every 1,000 hours of truck operation. If you
work in an abnormally severe or caustic
environment or if you have a rigorous duty
cycle, inspect the motor more frequently.
Set up and rigidly adhere to a strict inspection
schedule to obtain the maximum efficiency
from the electrical equipment.
Each partial inspection of the motor must
include the following:
1. Inspect the brushes for wear and for
correct contact with the commutator.
Record the level of wear on the brushes.
This history gives you an indication of
whether a brush must be changed or if it
can wait until the next inspection. Refer to
page 7-84 for acceptable brush length and
general motor information.
N
OTE: Overloading a unit is ultimately reflected
in the motor and brush wear; therefore,
you must take this into account when
considering brush replacement.
2. Check brush spring tension. See “Motor
Brush Spring Tension” on page 7-84.
3. Clean brushes and holders. Wipe the
commutator with a dry, lint-free cloth. DO
NOT USE lubricants of any kind on or
around the commutator.
4. Check brush holders for solid connection
to the mounting support. Tighten the
mounting screws as necessary.
5. Check the cap screws holding the brush
cross connectors to the brush holder body.
6. Make sure the motor terminals are
secured tightly to the motor frame. Be
careful not to strip the threads or crush
the insulating parts.
7. Check all the cap screws around the frame
for tightness.
8. Keep the outside frame of the motor clean
and free from dirt. Maintain a free air
passage around the motor to permit heat
radiation.
Motor Brush Replacement
If one brush needs replacement, always replace
the entire set of brushes.
Use only genuine Raymond brushes. Using
another type of brush could damage the
commutator or cause excessive brush wear.
If the end of the brush is not already contoured
to fit the commutator, use the following
procedure to seat the brush to the commutator.
N
OTE: If the motor commutator is not
accessible, form the brush contour
using a brush seating stone.
1. Move the motor brush springs out of your
way.
2. Wrap a piece of 00 sandpaper around the
commutator. DO NOT use emery cloth to
seat brushes.
3. Move the brushes back down in their
holders so that the face of the brushes
matches the curve of the commutator.
4. Remove the sandpaper.
5. Blow any dust out of the motor with clean,
compressed air at a maximum of 30 psi
(207 kPa).
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