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4.8.5 Alternator Brush Test Procedure
NOTE
Before performing test, removal of back cover is
required. To remove, disconnect wires from
terminals extending through back cover.
Remove two screws securing back cover to rear
housing and remove cover.
a. Removing Brush Set
1. Remove two locknuts securing brush holder and
remove brush assembly.
2. Check brush assembly for cracked, chipped or oil
soaked brushes. Remaining brush length should be at
least 3/16 inch (4.76 mm) long.
3. Check slip rings for carbon build-up.
4. Test brush assembly for continuity and insulation
per section 4.8.5.b.
b. Brush Continuity Check
Using a 12 vdc test lamp or ohmmeter, test brush
assembly for continuity and insulation as shown (see
Figure 4-11). Replace brush assembly if necessary.
CONTINUITY CHECK
Continuity
A to B
Continuity
C to D
No Circuit
A to C
No Circuit
A to D
No Circuit
B to C
No Circuit
B to D
D
C
Figure 4-11. Alternator Brush Assembly
OK
OK
OK
OK
OK
OK
B
A
4-10
4.8.6 Slip Ring Servicing
Clean brush contacting surfaces with fine crocus
cloth. Wipe dust and residue away.
If surfaces are worn beyond this restoration, replace
entire rotor assembly.
4.8.7 Alternator Installation
a. Make
sure
negative
disconnected.
b. Install alternator to mounting bracket with the
alternator pivot bolt and adjustment arm bolt loosely in
position.
c. Place V-belt on alternator sheave.
d. Check the center alignment of the generator
driving pulley and alternator pulley, to ensure proper
drive. Pulley misalignment will create excessive belt wear
and limit alternator bearing life. The center line of the
alternator sheave, and the driving sheave must be in line.
e. Pivot alternator to place tension on belt. For
correct belt tension see section 4.4.2.a.3. Tighten pivot
and adjustment bolts.
f. Connect wiring to alternator.
g. Connect battery cable. Start unit and check for
output per section 4.8.4, Test No.3.
battery
terminal
is
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