Filter
Top Products
Workman MDE
Page 3 -- 33
Electrical System
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.
Inspection
1. Make sure that on/off switch is OFF. Raise and latch
cargo box to allow access to traction motor.
2. Open the battery circuit by carefully removing one of
the battery cables (see Opening Battery Circuit in the
General Information section of this chapter).
3. Unlatch headband of traction motor and reposition
headband to allow inspection of abrush at the top of the
motor.
4. If end ofbrush is even with the brushholder (Figs. 47
and 49), brushes should be r emoved from motor for in-
spection andmeasurement (seeTraction MotorService
in this section).
5. In most instances, wear of all traction motor brushes
should be similar to wear found onthe 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 s ection).
6. If vehicle is often operated in severely dirty environ-
ments, brush should be removed frommotor 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).
7. Visually inspect commutator surface of motor arma-
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).
8. After brush inspection, make sure brush is correctly
installed in brush holder and tensioned by spring. Refit
headband to traction motor and latch headband.
9. Carefully connect removed battery cable to battery
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).
10.Lower and secure cargo box.
1. Brush
2. Brush holder
3. Brush spring (tensioned)
4. Brush spring (released)
Figure 47
2
1
3
4
1. Removed brush 2. Cap screw
Figure 48
1
2
1. Brush holder (side view)
2. Normal brush
3. Worn brush
4. Brush shunt wire
Figure 49
1
2
3
4
4
1
Electrical
System