Traction Motor Brushes
The traction motor in the Workman MDE uses eight (8)
brushes. Traction motor brushes should be inspected
every 500 hours of operation or annually.
4
2
3
Inspection
1.
cargo box to allow access to traction motor.
Make sure that on/off switch is OFF. Raise and latch
2.
the battery cables (see Opening Battery Circuit in the
General Information section of this chapter).
Open the battery circuit by carefully removing one of
1
3.
headband to allow inspection of a brush at the top of the
motor.
Unlatch headband of traction motor and reposition
Figure 47
4.
If end of brush is even with the brush holder (Figs. 47
1.
2.
Brush
Brush holder
3.
4.
Brush spring (tensioned)
Brush spring (released)
and 49), brushes should be removed from motor for in-
spection andmeasurement (seeTractionMotor Service
in this section).
5.
In most instances, wear of all traction motor brushes
1
should be similar to wear found on the top brushes. If in-
spection of remaining brushes is needed or if brushes
require replacement, traction motor should be removed
from vehicle (see Traction Motor and Traction Motor
Service in this section).
6.
If vehicle is often operated in severely dirty environ-
ments, brush should be removed from motor to allow in-
spection of mating surface of brush (Fig. 48). If brush
surface is rough, pitted, arced or scored, additional
brush and/or motor inspection should be completed
(see Traction Motor and Traction Motor Service in this
section).
2
Figure 48
7.
Visually inspect commutator surface of motor arma-
1.
Removed brush
2.
Cap screw
ture. If commutator surface is rough, pitted, arced or
scored, additional motor inspection should be com-
pleted (see Traction Motor and Traction Motor Service
in this section).
4
2
8.
installed in brush holder and tensioned by spring. Refit
headband to traction motor and latch headband.
After brush inspection, make sure brush is correctly
1
3
9.
Carefully connect removed battery cable to battery
4
terminals. Install lock washer and nut on battery termi-
nals. Torque nuts from 115 to 125 in--lb (13.0 to 14.1
N--m).
1
10.Lower
and secure cargo box.
Figure 49
1.
2.
Brush holder (side view)
Normal brush
3.
4.
Worn brush
Brush shunt wire
Workman MDE
Electrical System
Page 3 -- 33
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