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Page Title:
Table 2- 1. Troubleshooting-continued |
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 TM 9- 2920- 224- 34&P
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TROUBLESHOOTING INSTRUCTIONS - CONTINUED
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0005 00
MALFUNCTION
PROBABLE CAUSE(S)
CORRECTIVE ACTION
3. Generator produces full voltage
a. Voltmeter connections on test Connect test stand voltmeter
stand.
correctly.
with reverse polarity. reversed.
Check for proper connections at brush
b. Defective field current.
holders (WP 0010 00). If connected
properly, the housing assembly is
defective and must be replaced.
c.
Field coil energized with
Flash the field by closing the circuit
reversed polarity.
across reverse current relay with
generator running at 2500 rpm.
4. Excessive sparking at brushes.
a. Open--circuited or
Replace armature assembly
short--circuited armature.
Seat brushes (WP 0010 00) and
b. Brushes not properly seated
run--in (WP 0011 00).
on commutator.
c.
Short--circuited field windings. Replace housing assembly
d. Pitted or eccentric
Recondition commutator
commutator.
e. Worn ball bearings.
Replace ball bearings (WP 0008 00
and WP 0010 00).
f.
Weak or broken brush
Replace brush springs and check for
springs.
proper tension (WP 0010 00).
5. Generator overheats.
a. Obstruction in air passages.
Disassemble and clean the generator.
b. Broken or damaged cooling
Replace cooling fan assembly
fan.
c.
Open armature winding.
Replace armature assembly
d. Grounded positive brush.
Replace insulators in electrical end
bell (WP 0010 00).
e. Inoperative tube axial fan.
Repair or replace tube axial fan
6. Excessive brush movement.
Recondition commutator
a. Worn or out--of--round
commutator.
Replace brush springs and check for
b. Broken or weak brush spring.
proper tension (WP 0010 00).
END OF TASK
0005 00- 2
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