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 TM 9- 2920- 224- 34&P
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TROUBLESHOOTING INSTRUCTIONS
THIS WORK PACKAGE COVERS:
Troubleshooting Instructions and Malfunction/ Corrective Action Table
TROUBLESHOOTING INSTRUCTIONS
a. Visual Examination. Visually check for cracks, obvious damage, and missing screws or nuts on generator
housing and radio--noise suppression housing and its terminals.
Model G22--6F generator must be additionally checked for cracks and obvious damage to axial fan housing
and its electrical connector.
b. Generator Rotational Freedom Check. Try to rotate the generator drive shaft by hand. The drive shaft should
turn freely, but inertia of rotor (resistance due to rotor's weight) should be sensed as rotation starts or is
stopped.
1) If internal binding prevents manual rotation of the drive shaft, disassemble as necessary to repair and
correct cause of bind. (See WP 0008 00 for disassembly instructions.)
2) If generator drive shaft does not bind, but there is no rotor resistance, remove drive shaft assembly. (See
c.
Operating Tests. Table 2--1 lists common malfunctions that may be encountered, their probable cause, and
the recommended corrective action. If operating tests are required in order to determine the condition of
generator, see WP 0011 00.
Table 2- 1. Troubleshooting
MALFUNCTION
PROBABLE CAUSE(S)
CORRECTIVE ACTION
1. No generator output.
Replace brushes and recondition
a. Brushes making poor contact
commutator if necessary
with commutator.
b. Short circuited or grounded
Replace armature assembly
armature.
c.
Defective voltage regulator on Repair or replace voltage regulator
test stand.
used on test stand.
d. Insufficient residual
With generator running at 1000 rpm or
magnetism in generator field
higher, close circuit across reverse
poles.
current relay (used on test stand).
Generator should pick up the charge
and continue at normal output.
e. Reversed generator polarity.
Generator field should be "flashed" to
restore correct residual polarity within
field coils (WP 0011 00).
f.
Broken drive shaft.
Replace drive shaft assembly
Replace brushes if approaching the
2. Generator output is very low.
a. Brushes making poor contact
minimum length. Seat brushes
with commutator.
(WP 0010 00) and run--in
Replace armature assembly
b. Short--circuited or grounded
armature.
c.
Improperly adjusted voltage
Adjust, repair, or replace voltage
regulator on test stand.
regulator on test stand.
d. Short--circuited or grounded
Replace housing assembly
field windings.
0005 00- 1
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