• Serial number of the generator
Rectifier Block Test
Illustration 122 g00775020
Rectifier Block
(1) “AC1” terminal
(2) “AC2” terminal
(3) “AC3” terminal
(4) Negative terminal
(5) Positive terminal
Perform the following steps in order to test the
rectifier block. When possible, use the diode test
scale. If there is no diode test scale, use the
resistance scale.
1. Touch the red ohmmeter lead to the rectifier
terminal that is marked “+” .
2. Touch the black ohmmeter lead to the rectifier
terminals that have the following labels: “AC1” ,
“AC2” and “AC3” . The meter should indicate an
open circuit or high resistance for each rectifier
terminal. If the meter does not indicate an open
circuit or high resistance, the rectifier is bad.
Replace the rectifier.
3. Touch the black ohmmeter lead to the rectifier
terminal that is marked “+” .
4. Touch the red ohmmeter lead to the rectifier
terminals that have the following labels: “AC1” ,
“AC2” and “AC3” . The meter should indicate a
good diode or low resistance. If the meter does not
indicate a good diode or low resistance, the
rectifier is bad. Replace the rectifier.
5. Touch the black ohmmeter lead to the rectifier
terminal that is marked “−” .
6. Touch the red ohmmeter lead to the rectifier
terminals that have the following labels: “AC1” ,
“AC2” and “AC3” . The meter should indicate an
open circuit or high resistance for each rectifier
terminal. If the meter does not indicate an open
circuit or high resistance, the rectifier is bad.
Replace the rectifier.
7. Touch the red ohmmeter lead to the rectifier
terminal that is marked “−” .
8. Touch the black ohmmeter lead to the rectifier
terminals that have the following labels: “AC1” ,
“AC2” and “AC3” . The meter should indicate a
good diode or low resistance. If the meter does not
indicate a good diode or low resistance, the
rectifier is bad. Replace the rectifier.
Replace any faulty rectifiers with rectifiers that have
comparable operating characteristics. Include the
following information when a rectifier is being ordered
for replacement:
• Part Number of the rectifier
• Model number of the exciter
• Type of the exciter
• Serial number of the generator
i00151038
Severe Service Application -
Check
SMCS Code: 1000-535
Severe service is an application of an engine that
exceeds current published standards for that engine.
Caterpillar maintains standards for the following
engine parameters:
• Performance (power range, speed range and fuel
consumption)
• Fuel quality
• Altitude range
• Maintenance intervals
• Oil selection and maintenance
SEBU7125-13
149
Maintenance Section
Severe Service Application - Check
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