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Generator brushes may be replaced without dis-
assembling generator. Brushes should be replaced
if they are oil soaked or worn to less than 1/2 of
their original length.
1. Remove cover band and disconnect brush leads.
2. Lift brush arms, remove old brushes, install
new brushes in holders and connect brush
leads.
3. Cut a strip of 00 sandpaper the exact Width of
the commutator, slide sandpaper under brush
with sanded side against brush.
4. Pull the sandpaper so that brush is forced
against holder. Once or twice is sufficient.
NOTE: Blow sand and carbon dust out of
generator.
5. Run generator under load to obtain perfect
brush seating and re-install cover band.
GENERATOR MOTORIZING DRAW
After generator is assembled and brushes prop-
erly fitted, the motorizing draw should be checked
to assure proper assembly and alignment.
1. Connect an ammeter and battery in series with
the armature terminal and frame.
2. Ground the field terminal to the frame.
3. Connect a variable resistor in series with the
battery and generator.
4. Connect a voltmeter from the armature to the
frame.
5. Generator should operate as a motor with the
armature turning slowly.
6. Adjust voltage to 5 volts and read ammeter.
7. Motorizing draw should be 4.1 to 4.6 amperes. If
motorizing draw is higher, or armature does not
turn, worn bearings, incorrect bearing alignment,
short circuits, or improper assembly is indicated.
GENERATOR CIRCUIT RESISTANCE
1. Disconnect battery lead to voltage regulator "B"
terminal; connect the ammeter negative lead to
ELECTRICAL SYSTEM 64
the regulator "B" terminal and the positive lead
to the wire disconnected from the regulator,
Figure 2.
2. Install the negative voltmeter lead to the
generator "A" terminal and the positive volt
meter lead to the battery negative terminal.
.
FIGURE 2
3. Connect a jumper between the generator "F"
terminal and a ground.
4. Run the engine until am meter shows 20 amperes. The
voltmeter should not read over .9 (tenths) or less.
5. If the resistance is more than .9, make the following
checks with the ammeter connected as in paragraph 1.
A. Remove the positive voltmeter lead from the
battery and connect it to the "A" terminal at
the voltage regulator. Ammeter should show
less than .1 (tenth).
B. Connect the voltmeter negative lead to the
regulator "A" terminal and the voltmeter
positive lead to the regulator "B" terminal.
Ammeter should not show more than .3
(tenths).
C. Next, connect the voltmeter positive lead to
the battery negative terminal, negative lead to
"B" terminal on regulator. Ammeter should
not show more than .5 (tenths).
D. Connect the voltmeter positive leads to en-
gine ground, negative to base of regulator. Am-
meter should show .2 (tenths) or less.
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