10
REV C
60706-241
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
Low Output Voltage
1. Undersized/overloaded.
2. Defective governor.
3. Low power - worn engine.
4. High line loss. Indicated by lower voltage at
load than at generator terminals.
5. Shorted or grounded rotor coil.
6. Defective stator.
7. Underspeed
1.Check for overload on the tractor or undersized.
2. Check tractor governor. Tight or defective throttle
levers and joints.
3. Worn or defective tractor engine.
4. Increase size of line wiring. Might also be the result of
loose connection indicated by excessive heating at the
loose connection terminal.
5. Test and replace if defective.
6.Repair or replace as required.
7. Verify frequency is between 59-61 Hz
High Output Voltage
Generator is spinning too fast, slows prime mover
down.
Readjust or replace as required.
Excessive Heating
Clogged ventilating inlet and/or outlet
Clean screens, make sure interior of generator is
unobstructed.
No Output Voltage
1. Broken or corroded connection
2. Defective diode(s) on rotor.
3. Open exciter circuit in stator.
4. Grounded or shorted rotor winding.
5. Loss of residual magnetism. Usually occurs
only after disassembly of field frame or severe
mechanical stress/abuse.
6. Shorted stator winding. This can be identified
by the use of an internal “growler” at a
competent rewinding shop.
7. Grounded stator. Check winding by test lamp
or high potential tester from stator leads to
lamination.
8. Open stator circuit. Measure circuit between
leads with an ohmmeter. Should have a circuit
between any pair of leads.
9. Defective Capacitors.
1. Clean and tighten generator and receptacle
connections.
2. Replace defective diode(s).
3. Repair or replace stator assembly.
4. Replace grounded rotor assembly.
5. Back flash the 120 Volt circuit with 12 Volts DC
6. Replace stator. )Include generator model and serial
number on the order).
7. Same as #6.
8. Same as #6.
9. Test and replace if defective.
Voltage Unsteady/Lights
Flickering
1. PTO drive line off alignment.
2. Drive line knuckles out of sync.
1. Realign within 5 degrees.
2. Re-sync drive line halves.
TROUBLE SHOOTING TABLE
