OPERATION
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ENGINE CONTROLS (Items 1 through 8)
1. 
RUN/STOP 
SWITCH
When placed in the RUN position, this switch energizes the fuel solenoid and other electric accessories. When placed in the STOP position, the flow of fuel to the injection pump is stopped to shut down the engine.
NOTE: If the switch is left in the RUN position and the engine is not running, the fuel solenoid will be engaged for 15 seconds and then shut down. This is to protect the battery from discharge. After 15 seconds, the RUN/STOP switch must be toggled off then on before starting.
2. START PUSHBUTTON
Energizes the starter motor to crank the engine. With the engine RUN/STOP switch in the RUN position, push and hold the Start button to crank the engine; release as the engine starts. The Start button must be depressed for a minimum of two seconds. Do not press it while the engine is running, since this can cause damage to the ring gear and/or starter motor.
3. FUEL LEVEL GAUGE AND LIGHT
4. ENGINE TEMPERATURE GAUGE
The gauge displays the engine oil temperature. The yellow temperature light remains off under normal operating temperatures. If the light turns on, the engine protection system will shut down the engine. Check for restrictions at the engine cooling air inlets and outlets. (Consult the engine Operator’s Manual.) Check for loose or disconnected leads at the temperature sender located on the engine. Check the engine cooling blow- er belt. Also, check to be sure that the welder loads are within the rating of the welder. The light will remain on when the engine has been shut down due to an over- temperature condition.
5. OIL PRESSURE GAUGE (K1639-2 Std.,
K1639-1 Opt.) AND LIGHT
The gauge displays the engine oil pressure when the engine is running. The yellow oil pressure light remains off with proper oil pressure. If the light turns on, the engine protection system will stop the engine. Check for proper oil level and add oil if necessary. Check for loose or disconnected leads at the oil pressure sender located on the engine. The light will go on and stay on when the RUN/STOP switch is switched to the RUN position with the engine not running.
6. ENGINE ALTERNATOR AMMETER
The yellow engine alternator light is off when the bat- tery charging system is functioning normally. If the light turns on, the engine protection system will shut down the engine. Check the engine cooling blower belt. Also, the alternator or the voltage regulator may not be oper- ating correctly. The light may also come on due to a faulty flashing circuit. The light will remain on when the engine has been shut down due to a fault in the alter- nator, regulator, or the cooling blower belt.
7. IDLER SWITCH
Has two positions as follows:
A) In the HIGH position 
, the engine runs at the high idle speed controlled by the governor.
B)In the AUTO 
/ 
position, the idler oper- ates as follows:
a.When switched from HIGH to AUTO or after starting the engine, the engine will operate at full speed for approximately 12 seconds and then go to low idle speed.
b.When the electrode touches the work or power is drawn for lights or tools (approximately 100 Watts minimum) the engine accelerates and operates at full speed.
c.When welding ceases or the AC power load is turned off, a fixed time delay of approximately 12 seconds starts.
d.If the welding or AC power load is not restarted before the end of the time delay, the idler reduces the engine speed to low idle speed.
e.The engine will automatically return to high idle speed when the welding load or AC power load is reapplied.
COMMANDER 500
