6-31
WARNING
Many troubleshooting procedures present hazards which can result in severe personal
injury or death. Only qualified service personnel with knowledge of fuels, electricity, and machinery
hazards should perform service procedures. Review safety precautions on page iii.
TABLE 6-14. GENERATOR TROUBLESHOOTING
Trouble Possible Cause Corrective Action Section/
Page
AC Output 1. Engine governor out of adjustment. 1. Refer to
Governor Adjustments
8-9
Voltage Too
High 2. If generator frequency is within 2. Refer to Table 8-1 for voltage/frequency
specified limits but voltage is incorrect, specs. Replace electronic voltage
electronic voltage regulator is defective. regulator.
Noisy 1. Loose brush holder. 1. Tighten brush holder.
Generator 2. Worn rotor bearing. 2. Replace rotor bearing. 9-13
3. Rotor and stator rubbing together 3a. Check for varnish lumps between
due to: rotor and stator, remove as required.
a. Varnish lumps. 3b. Follow specified assembly procedures 9-7
b. Rotor misaligned with crankshaft. to correct rotor to crankshaft
alignment.
Generator 1. Generator overloaded due to 1. Replace circuit breaker. Do not
Overheats defective circuit breaker. exceed specified load when
operating genset.
2. Airflow restricted due to dirt or 2. Clear away all dirt or debris as required.
debris covering vent openings in
stator housing.
3. Stator windings covered with oil 3. Clean stator windings.
or dirt.
4. Defective rotor or stator windings. 4. Test each component for open, 9-8
grounded, or shorted windings and
replace if defective.
5. Loose or missing service access cover 5. Check for proper fit of service access
or improper seal around the endbell cover and check seal around endbell.
assembly.
6. Improper installation due to:
a. Insufficient air inlet size. 6a. Make sure air inlet is not blocked and
b. Air inlet location allowing that it is properly sized (refer to
recirculation. Installation Manual).
6b. Make sure that air outlet is not blocked
and check for recirculation of outlet air.
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