Kohler 4EFOZ Operation Guide

TP-6068 10/02
28 Section 4 Troubleshooting
Section or
Publication
Reference*
Recommended ActionsProbable Causes
Trouble Symptoms
Section or
Publication
Reference*
Recommended ActionsProbable Causes
Excessive or
abnormal noise
High fuel
consumption
Low oil
pressure
Overheats
Lacks power
Stops
suddenly
No or low
output v oltage
Starts hard
Cranks but
does not start
Does not
crank
Fuel System
x x Fuel tank empty or fuel valve shut off Add fuel and move the fuel valve to the ON position. — x x x x Fuel filter restriction Clean or replace the fuel filter. Eng. O/M x Fuel solenoid inoperative
Troubleshoot the fuel solenoid.[
Eng. S/M
x x x Air in fuel system (diesel only) Bleed the diesel fuel system. Eng. O/M x x x
Fuel or fuel injectors dirty or faulty (diesel only)
Clean, test, and/or replace the inoperative fuel injector.[
Eng. S/M
x x x x
Fuel injection timing out of adjustment (diesel only)
Adjust the fuel injection timing.[
Eng. S/M
x x x
Fuel feed or injection pump inoperative (diesel only)
Rebuild or replace the injection pump.[
Eng. S/M
Generator
x
AC output circuit breaker open Reset the breaker and check for AC voltage at the generator
side of the circuit breaker.
—
x
Transfer switch test switch in the OFF position
Move the transfer switch test switch to the AUTO position. ATS O/M
x
Wiring, terminals, or pin in the exciter field open
Check for continuity. Gen. S/M, W/D
x
Main field (rotor) inoperative (open or grounded)
Test and/or replace the rotor.[
Gen. S/M
x Stator inoperative (open or grounded)
Test and/or replace the stator.[
Gen. S/M
x Vibration excessive
Tighten loose components.[
—
x x Voltage regulator out of adjustment Adjust the voltage regulator. Gen. S/M x x
Voltage regulator inoperative Replace the voltage regulator fuse, If the fuse blows again,
troubleshoot the voltage regulator.
Gen. S/M
Lube System
x x x Oil level low Restore the oil level. Inspect the generator set for oil leaks. Eng. O/M
x Low oil pressure shutdown Check the oil level. Eng. O/M
x x x x
Crankcase oil type incorrect for ambient temperature
Change the oil. Use oil with a viscosity suitable for the operating climate.
Eng. O/M
* Sec./Section—numbered section of this manual; ATS—Automatic Transfer Switch; Eng.—Engine; Gen.—Generator Set; I/M—Installation Manual; O/M—Operation Manual; S/M—Service Manual;
S/S—Spec Sheet; W/D—Wiring Diagram
[ Have an authorized service distributor/dealer perform this service.

Kohler 4EFOZ Specifications

General

Brand	Kohler
Model	4EFOZ
Category	Portable Generator
Language	English