TM-9-2815-220-24
AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL FOR AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TM-9-2815-220-24 - Page 159 of 1563
TM 9-2815-220-24
GENERATOR ABNORMAL OPERATION (650 AMPERE)
0021 00
MALFUNCTION 2:
(Continued)
Undercharging (maximum indicator reading in “yellow” during vehicle operation.
PROBABLE CAUSE
CORRECTIVE ACTION
c. Voltage regulator defective.
(1) Inspect voltage regulator and replace if
necessary (refer to pertinent vehicle
technical manual).
d. Generator drive gear assembly failure.
.
(1) Perform functionality check as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Remove 1/8-inch pipe plug
located in center of end plate
and install 200 psi gauge.
Oil pressure 100
±
10 psi.
Generator oil pump operation is
normal, the generator is rotating
and the drive coupling is
functioning.
Start and warm up engine at
idle speed (675-725 rpm) to
operating temperature
(140
°
F).
Oil pressure same as
normal engine gallery
pressure (15-25 psi).
Generator oil pump failed, and/or
generator not rotating, and/or
drive coupling failed.
Go to next
step.
PROBABLE CAUSE
CORRECTIVE ACTION
d. (Continued)
Failed generator drive gear
assembly.
(2) Check slip torque of drive coupling
assembly (WP 0039)
(3) If drive coupling is OK and generator failed
functionality test, replace generator
(WP-0051, Generator Replacement - 650
Ampere).
MALFUNCTION 3:
Overcharging (indicator reads right “red”).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Loose or corroded battery terminals, or
grounded cables.
(1) Inspect, clean, tighten, or repair as
necessary (refer to pertinent vehicle
technical manual).
b. Defective batteries.
(1) Check individual battery cells.
Replace
defective batteries (refer to pertinent vehicle
technical manual).
c. Voltage regulator defective.
(1) Inspect voltage regulator and replace if
necessary (refer to pertinent vehicle
technical manual).
WP 0021 00-3
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