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 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
Generator oil pump failed, and/or
Oil pressure same as normal
(Continued) Start and
generator not rotating, and/or
engine gallery pressure (15-25
warm up engine at idle
drive coupling failed.
psi).
speed (675-725 rpm) to
operating temperature
(140 F).
Note if there is slippage of the
Check slip torque of drive
If slippage occurs below 167 foot
drive gear while increasing
gear assembly (WP 0039,
pounds, drive gear assembly is
torque to 167 foot pounds.
NOTE: Generator must
defective.
be removed (WP 0051).
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
Check torque-rotational
Note deflection in degrees
deflection rate (WP 0039)
from zero torque to 167 foot
less than 17, drive gear
pounds torque.
assembly is satisfactory.
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
(1) Replace drive gear assembly (WP 0156,
assembly.
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
(1) Inspect, clean, tighten, repair or replace as
terminals or cables.
necessary (refer to pertinent vehicle
technical manual).
b. Defective batteries.
(1) Check individual battery cells (refer to
pertinent vehicle technical manual).
(2) Replace batteries (refer to pertinent vehicle
technical manual).
WP 0021 00-2
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