Page 9
60706-160 REV 3
3117-30
SYMPTOM
CAUSE(S)
CORRECTIVE ACTION
High voltage.
1.
Defective or misadjusted AVR
1.
Adjust, repair or replace as required.
Output voltage
1.
Tumbling bar (coupling shaft)
1.
Reduce tumbling bar misalignment to less than 15 degrees.
flickering or
misalignment.
fluctuation.
2.
Engine speed not constant.
2.
Engine governor may be worn or improperly adjusted. Set or
repair defective governor.
3.
Loose connection in field circuit.
3.
Check and tighten connections.
4.
Tumbling bar U-joints not
4.
Reassemble tumbling bar; see Figure 7.
synchronized.
Excessive
1.
Power take-off misalignment
1.
Correct misalignment. It should be less than 15 degrees.
vibration.
excessive.
2.
Loose mounting nuts and bolts
2.
Tighten mounting nuts and bolts; repair hold-down stud
or hold-down studs.
mountings.
3.
Universal joints in coupling
3.
Repair or replace defective parts.
shaft worn or dry.
4.
Defective bearings.
4.
Check for possible causes. Replace defective bearings.
Generator
1.
Poor ventilation.
1.
Clean ventilation and cooling fan screens.
overheating.
2.
Generator overloaded.
2.
Reduce load, then check voltage and current.
3.
Shorted turns in field or
3.
Replace defective components.
stator windings.
Oil leak.
1.
Loose plug in gear case.
1.
Tighten plug.
2.
Defective seal, gasket, or
2.
Replace seal(s), gaskets or plugs. Maintain correct oil level.
plug in gear case.