Brush and Brush Spring Service (Fig. 24)
10.Slide brushes into holders. Secure brushes by posi-
tioning brush springs into the notch at the end of the
brushes (Fig. 27).
IMPORTANT: When removing or installing the com-
mutator end cover, make sure brushes do not con-
tact the commutator. Damage to the brushes may
result.
11.Install brush covers to the commutator end cover.
1.
Removebrushcoversfromthecommutator endcov-
3
er. Lift brush springs from the notch at the end of the
brushes while pulling the brushes out. Allow springs to
hold brushes out from the center (Fig. 25).
2.
ingthecommutator endcovertotheyoke.Separateend
cover from the commutator and yoke.
Remove both through bolts and flat washers secur-
1
IMPORTANT: Use clean, dry, lint--free rags when
cleaning the starter/generator. When using com-
pressed air, air should be filtered and should not ex-
ceed 15 PSI (103 kPa).
2
3.
dust from the commutator end cover and brushes.
Remove brushes from their holders. Clean carbon
Figure 25
3.
1.
2.
Brush
Spring
Brush holder
IMPORTANT: Label armature leads connected to
brush leads prior to disconnecting any brush leads.
3
1
0.063 inch
(1.6 mm)
4.
Inspect brushes for damage.
A. Replace any brush that is cracked or severely
chipped.
B. If the length from the end of the brush to the wear
line is less than 0.063 inch (1.6 mm), replace all four
2
4
(4)
brushes (Fig. 26).
Figure 26
3.
4.
5.
all four brushes if any brush is straw or bluish colored.
Inspectbrushspringsforheatdiscoloration.Replace
1.
2.
Brush
Brush holder
Wear line
Set screw
6.
Check brush springs for correct tension.
3
A. Secure all four (4) brushes into their holders with
the brush springs.
1
B. Using a spring scale, check tension on all four (4)
brushes in the direction of the spring (Fig. 27).
C. Replace all four (4) springs if any spring’s tension
is less than 24 ounces (1.6 N).
24
oz
N)
(1.6
7.
and lock washers.
Secure brush and armature leads with set screws
2
8.
brushes while pulling the brushes out. Allow springs to
hold brushes out from the center (Fig. 25).
Lift brush springs from the notch at the end of the
9.
Position commutator end cover to the commutator
Figure 27
3.
and yoke. Secure commutator end cover to the yoke
with both through bolts and flat washers. Torque bolts
from 96 to 104 in--lbs (10.8 to 11.8 N--m).
1.
2.
Brush spring
Brush
Brush holder
Workman MD/MDX
Page 6 -- 21
Electrical System
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