Kohler Decision-Maker 1 Manual page 177

The adjustment procedure requires:
D
Digital voltmeter (DVM).
D
Engine oxygen sensor (part number A-345052).
D
Load bank capable of rated kW for the fuel being
used. See step 3.e. comment.
Read the entire installation procedure before adjusting
the fuel mixture. Perform the steps in the order shown.
1. Remove the generator set from service.
a. Place the generator set master switch in the
OFF position.
b. Disconnect power to the battery charger, if
equipped.
c. Disconnect the generator set engine starting
battery, negative (--) lead first.
2. Install the oxygen sensor.
a. Remove the oxygen sensor pipe plug from the
exhaust pipe. See Figure 9-29 for location.
1
1. Exhaust tube pipe plug
2. Fuel mixture adjustment screw
3. Oxygen sensor
Figure 9-29 Oxygen Sensor Mounting Location,
Typical (30 kW model shown)
b. Install the oxygen sensor in the exhaust tube
where the plug was removed.
c. Connect one of the DVM leads to the oxygen
sensor lead. Connect the other DVM lead to
ground and measure the oxygen sensor output
voltage (potential to ground).
TP-6356 4/12
3. Start and warm up the generator set.
4. Adjust the fuel mixture valve.
3
2
ADV-6548D-H
1. Fuel adjusting screw
Figure 9-30 Fuel Mixer Adjustment, Typical
5. Stop the generator set.
a. Check that the generator set master switch is in
the OFF position.
b. Reconnect the generator set engine starting
battery, negative (--) lead last.
c. Place the controller master switch in the RUN
position to start generator set.
required will depend on the size of the
generator set.
d. Allow the generator set to run until the
generator set reaches normal operating
temperature.
e. With the generator set at normal operating
temperature, apply 90%--100% of rated load. If
a load bank is not available, apply a load at
least comparable
connected to the generator set.
a. Adjust the fuel metering valve (Figure 9-30) as
required to obtain a 0.8--0.9 VDC oxygen
sensor output. The oxygen sensor output
reads high when the mixture is richer and close
to zero volts when the mixture is leaner.
1
3
2. Lean
The gas mixer adjustment is molded into the
gas mixer inlet on air valve-type models or is a
separate fitting upstream of the gas mixer on
venturi-type models.
b. Remove the load and allow the generator set to
run unloaded to cool for at least 5--10 minutes.
a. Place the generator set master switch in the
OFF position.
b. Disconnect the generator set engine starting
battery(ies), negative (--) lead first.
Section 9 Gas Fuel Systems
The time
to what is generally
2
TP-5750-3
3. Rich
177