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IAwARNINGI
Many troubleshooting procedures
present
hazards which can result
in
se-
vere
persona/Injury
or
death.
Only
qualified service personnel with knowledge
of
fuels,
electricity,
and
machinery hazards
should
perform service procedures. Review safety
precautions
on
Inside
cover
page.
Trouble
AC Output
Voltage Too
Low
or
Too
High
Noisy
generator
Possible Cause
1. Engine governor (mechanical)
out of adjustment.
2. Brushes worn
or
not making good
contact with slip rings. (Low
or
intermittent AC output voltage.)
3. Poor wiring connections to/from
voltage regulator.
4. If generator frequency is within
specified limits but voltage is incor-
rect, voltage regulator is defective.
5. Open, grounded,
or
short circuit in
rotor
or
stator.
1. Loose brush holder.
2.
Worn generator end bearing.
3. Rotor and stator rubbing together
due to:
a. Varnish lumps.
b.
Rotor misaligned with crankshaft.
8-6
Corrective Action
1. Refer to governor adjustments
in
Section 6.
2.
Check length of brushes and replace
if
worn excessively. Clean
or
replace
slip rings.
3. Check for good wiring connections
and correct as required. Check for
continuity and correct
if
circuit is open.
4. Replace voltage regulator.
5.
Test each component for open,
grounded,
or
shorted windings and
replace if defective.
1. Tighten brush holder.
2. Replace end bearing.
3a. Check for varnish lumps between
rotor and stator, remove as required.
3b. Follow specified assembly procedures
to correct rotor to crankshaft
alignment.
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