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 158 of 1563
TM 9-2815-220-24
GENERATOR ABNORMAL OPERATION (650 AMPERE)
0021 00
MALFUNCTION 1:
(Continued)
Not charging (indicator reads in “yellow” same as battery reading with engine stopped and
master switch “ON”.
PROCEDURE
OBSERVATION
ANALYSIS
(Continued)
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.
If slippage occurs below 167 foot
pounds, drive gear assembly is
defective.
Check slip torque of drive
gear assembly (WP 0039,
NOTE: Generator must
be removed (WP 0051).
Note if there is slippage of the
drive gear while increasing
torque to 167 foot pounds.
If no slippage occurs below
167 foot pounds, slip torque is
acceptable, but gear assembly
may have other damage (low
torque rate).
Proceed to next
step.
If rotation is more that 8
°
, but
less than 17
°
, drive gear
assembly is satisfactory.
Check torque-rotational
deflection rate (WP 0039)
Note deflection in degrees
from zero torque to 167 foot
pounds torque.
If rotation is greater than 17
°
or
less than 8
°
, the drive gear
assembly is defective.
PROBABLE CAUSE
CORRECTIVE ACTION
d. (Continued) Failed generator drive gear
assembly.
(1) Replace drive gear assembly (WP 0156,
Generator Replacement - 650 Ampere).
MALFUNCTION 2:
Undercharging (maximum indicator reading in “yellow” during vehicle operation.
PROBABLE CAUSE
CORRECTIVE ACTION
a. Loose, corroded or grounded battery
terminals or cables.
(1) Inspect, clean, tighten, repair or replace as
necessary (refer to pertinent vehicle
technical manual).
(1) Check individual battery cells (refer to
pertinent vehicle technical manual).
b. Defective batteries.
(2) Replace batteries (refer to pertinent vehicle
technical manual).
WP 0021 00-2
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