Figure 13 - Removing Drive End Housing
From Rotor Shaft.
16.
Remove four screws and bearing retainer
(Figure 14) and press bearing out of drive end
housing.
Figure 14 - Removing Drive End Bearing Retainer.
COMPONENT TESTING
Before performing these tests, carefully inspect all parts
for wear, cracks, breakage, or other mechanical defects.
Discard all damaged parts.
DIODE TESTS
These tests may be performed on heat sink assemblies
without removing them from the end housing. If they are
tested in this manner, remove the stator and be sure that
the red and black leads are disconnected from the
regulator and not touching each other. Disconnect the
capacitor across the lower end of the heat sinks.
Diodes are tested to insure that they only pass current in
one direction. Diodes which do not allow current to flow
in either direction are open while diodes passing current
both ways are shorted. Diodes should be checked with a
diode tester, but in emergencies where one is not
available, an ohmmeter or a battery powered test light
may be substituted.
Positive Heat Sink Tests
The positive heat sink is the one to which the positive
output terminal is connected. The square hole in the
terminal end of the positive heat sink is larger than the
terminal hole of the negative heat sink.
1.
Connect the positive lead of the diode tester,
ohmmeter, or test light to the positive heat sink
and touch the negative test lead to each of the
three diode terminals (Test 1, Figure 15). A high
resistance should be indicated and if a test light
is being used, it should not light. If any of the
three diodes shows a low resistance, or the test
lamp
lights,
the
diode
is
shorted.
See
IMPORTANT on next page.
Figure 15 - Positive Heat Sink Tests.
2.
Reverse the test leads so that the negative test
lead is connected to the positive heat sink. The
positive test lead should now be touched to each
diode terminal (Test 2, Figure 15). A low
resistance reading should be obtained. If a high
resistance reading is obtained, or the test lamp
fails to light, an open diode is indicated. See
IMPORTANT on next page.
Negative Heat Sink Tests
1.
Connect the negative test lead to the negative
heat sink and touch the positive test lead to each
diode terminal (Test 1, Figure 16). If a low
resistance reading is obtained, or if the test lamp
lights, the diode is shorted. See IMPORTANT
on next page.
CTS-4043A - Chapter II -- Page 7
