Kohler Decision-Maker 1 Manual page 183

1. Place the generator set master switch in the OFF
position.
2. Disconnect power to the battery charger, if
equipped.
3. Disconnect the generator set engine starting
battery, negative (--) lead first.
Use the following procedure to field adjust fuel mixture
on generator sets that are not California Air Resources
Board (CARB) or United States Environmental
Protection Agency (EPA) certified.
metering valve adjustment provides both reliable cold
starting and overall generator set performance.
The adjustment procedure requires:
D
Digital voltmeter (DVM).
D
Engine oxygen sensor service kit GM29385 that
contains:
UEGO Oxygen Sensor part no. GM28980
UEGO Sensor Interface Harness part no. GM28981
UEGO Air/Fuel Control Module part no. GM28982
D
Load bank capable of rated kW for the fuel being
used. See step e. comment.
D
Manometer with range of 0--15 inches of water.
Read the entire installation procedure before adjusting
the fuel mixture. Perform the steps in the order shown.
1. Remove the generator set from service.
2. Place the generator set master switch in the OFF
position.
3. Disconnect power to the battery charger, if
equipped.
4. Disconnect the generator set engine starting
battery, negative (--) lead first.
5. Install the oxygen sensor and interface harness.
a. Remove the oxygen sensor pipe plug from the
exhaust pipe. See Figure 9-45 for location.
b. Install the oxygen sensor in the exhaust tube
where the plug was removed.
c. Connect the oxygen sensor (GM28980) to the
interface harness (GM28981). See Figure 9-47.
d. Connect the air/fuel control module (GM28982)
to the interface harness.
TP-6356 4/12
Correct fuel
1. Exhaust tube pipe plug
Figure 9-45 Oxygen Sensor Mounting Location,
e. Connect the digital voltmeter (DVM) to the
6. Install the manometer.
a. Remove the 1/8 NPT pipe plug from the
b. Connect the manometer to the solenoid fuel
1. Manometer connection port
Figure 9-46 Solenoid Fuel Valve Manometer Port
7. Start and warm up the generator set.
a. Check that the generator set master switch is in
b. Reconnect the generator set engine starting
Typical (30 kW model shown)
interface harness. Connect one of the digital
voltmeter (DVM) leads to the yellow output
lead. Connect the other DVM lead to the
black/yellow output lead.
f. Connect the interface harness red (+) and
black (--) battery clips to a 12-volt battery
solenoid fuel valve located at the generator set
fuel inlet connection. See Figure 9-46.
valve port.
the OFF position.
battery, negative (--) lead last.
Section 9 Gas Fuel Systems
1
ADV-6548D-H
1
GM20708
183