Troubleshooting Guide - Kohler PRO6.4 Service Manual

Troubleshooting

TROUBLESHOOTING GUIDE

When troubles occur, be sure to check simple causes which, at fi rst, may seem too obvious to be considered. For
example, a starting problem could be caused by an empty fuel tank.
Some general common causes of generator troubles are listed below and vary by specifi cation. Use these to locate
causing factors.
Condition
No AC output
Low voltage at stator
Alternator can't output
rated power
Tests
Stator voltage
6
Possible Cause
Circuit breaker in OFF position.
Circuit protector popped out.
Engine not operating at rated RPM.
Circuit breaker or receptacles faulty.
Stator is faulty.
Brushes are faulty.
AVR is faulty.
Field polarity was lost.
Engine not operating at rated RPM.
Overload condition.
Appliance is faulty.
KohlerPower.com
Solution
Switch circuit breaker to ON.
Press circuit protectors.
Adjust engine running at normal operating
temperature to 3750 ± 100 RPM.
Test for voltage at circuit breaker and
receptacles.
Test for voltage and resistance.
Test for resistance between brushes and
slip ring.
Test for voltage.
Flash rotor fi eld.
Adjust engine running at normal operating
temperature to 3750 ± 100 RPM.
Calculate electrical power required by
electric appliances (in Watts). Reduce
total wattage of connected electric devices
within application range.
Repair faulty appliance.
Note: Make sure that auto idle feature is
turned off during the test.
Remove rear cover and start engine with
no load. Check if stator terminals have
correct voltage. The voltage from ground
to each winding is 120V and from winding
to winding is 240V. All values have ±10%
tolerance.
TP-7088 6/17