Kohler 6VSG

62 Section 4 Troubleshooting TP-6844 1/13
Lacks
power
Air intake
restriction,
inadequate cooling
Inspect air intakes and exhaust for
obstructions.
Check air cleaner.
Clear air intakes and exhaust
area. Maintain clearances shown
on the genset dimension drawing.
Replace air cleaner element.
I/M
O/M
Generator
overloaded
Reduce electrical load and check
operation.
Unplug some lights or appliances
connected to the generator set.
—
Spark plug(s) Check spark plugs. Regap or replace plug(s). O/M
Spark plug
connections
Check tightness and condition of
spark plug wires.
Tighten or replace spark plug
wires.
Engine S/M
Low fuel pressure Check fuel pressure at carburetor
outlet. Check for adequate fuel
pipe size and meter capacity for
generator set and all gas-fired
appliances.
Contact fuel supplier to replace
pipe and/or meter as required to
provide sufficient fuel supply
pressure for the generator set and
all gas-fired appliances.
Section 5.8
Fuel line restriction Check fuel pipe size. Contact fuel supplier to provide
larger pipe.
Section 5.8
Fuel regulator Check function of fuel regulator. Repair or replace fuel regulator. Section 5.8.2
Engine not running
at rated rpm
Check controller setting for engine
model. *
Check engine speed.
Select the correct engine model. *
Adjust engine speed.
Section 3.3
Engine power loss Refer to the engine service
manual for troubleshooting and
repair instructions.
Refer to the engine service
manual for troubleshooting and
repair instructions.
Engine S/M
Governor
malfunction or
misadjustment
Test governor. Adjust governor. Section 5.6
Ignition system See the engine service manual for
service procedures.
See the engine service manual for
service procedures.
Engine S/M
Low output
or
excessive
drop in
voltage
Generator
overloaded
Reduce electrical load and check
operation.
Unplug some lights or appliances
connected to the generator set.
—
Incorrect controller
settings
Check the controller settings. * Adjust the controller settings. * Section 3.3
Incorrect controller
voltage settings
Check the controller voltage
settings. *
Adjust the controller voltage
settings. *
Section 3.3
Alternator Perform alternator
troubleshooting, Section 5.2.
Make repairs based on results
from alternator troubleshooting,
Section 5.2
Section 5.2
Controller Check the controller settings. Adjust controller settings. Section 3.3
Test the controller as described in
Section 4.10.
See Section 4.10. Section 4.10
Stator Test stator for open, grounded, or
shorted windings.
Replace stator if faulty windings
are found.
Section 5.3
Rectifier Perform Rectifier Troubleshooting,
Section 5.3.
Make repairs based on Rectifier
Troubleshooting, Section 5.3
Section 5.3
Low engine speed
causing voltage
roll-off
Check system voltage, system
frequency, and engine model
settings.
Change the controller settings if
not correct. *
Section 3.3
Check engine speed setting. Adjust engine speed setting. Section 3.3
Engine problem. Troubleshoot the engine. Engine S/M
Problem Possible Cause Test Corrective Action Reference
W/D = Wiring Diagram(s) (Section 7) Engine S/M = Engine Service Manual
I/M = Generator Set Installation Manual O/M = Generator Set Operation Manual
S/S = Generator Set Specification Sheet