TP-6805 8/1570 Section 5 Troubleshooting
15. Is the carburetor gasket interfering with the throttle
plate or linkage?
a. Yes? Trim the carburetor gasket and test the
operation before replacing the carburetor. See
Figure 5-11.
Note: Engines with serial numbers 4223605221 or
higher have a new carburetor gasket that
does not require trimming.
b. No? Proceed to the next step.
2
tp6806
1. Trim this edge if necessary
2. Trim 0.75 mm (0.03 in.) from the edge of each opening
1
Figure 5-11 Tr imming the Carburetor Gasket
16. While running the unit with no load, unplug the
stepper motor harness. Does hunting continue?
a. Yes? Then it is not a controller or governor
issue. We can now narrow it down to these
possibilities:
D Regulator replacement
D Fuel solenoid replacement
D Spark plug condition check/replacement
D Perform a cylinder leak-down test. See the
engine service manual for instructions.
D If none of these procedures remedy the
hunting, contact the Kohler Generator
Service Department.
b. No? Controller issue. Update the RDC2
controller software to version 4.09 or higher.
Note: For the Model 20RES with RDC controller only,
test the magnetic pickup as described below.
D Is the magnetic pickup operating correctly?
Measure output voltage at the quick
disconnects. Should be a minimum of 3 VAC
while cranking.
D Monitor the magnetic pickup frequency
measurement while manually holding the
engine RPM steady. The frequency should
remain constant. If it is erratic, check the wiring
and crimp connections. Check that the mag
pickup air gap is 0.5 mm (0.020 in.) and adjust if
necessary. If measurements are still erratic,
replace the magnetic pickup.
17. Reconnect the ATS by connecting PWR and COM
(RXT) or engine start leads 3 and 4 (RDT).
18. Verify the generator set operation. See the
generator set Operation Manual for instructions.
Note: If the generator set still hunts after performing
these procedures, please contact the Kohler
Generator Service Department for assistance.
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