Engine Controls

B-3	OPERATION	B-3

IGNITION SWITCH

When placed in the “ON” position, this switch ener- gizes the fuel solenoid. When placed in the “OFF” position, the flow of fuel to the injection pump is stopped to shut down the engine.

“IDLER” SWITCH

The idler switch has two positions, “HIGH” and “AUTO”.

When in “HIGH” ( ) position, the engine will run continuously at high idle.

When in “AUTO” ( /) idle position, the idler operates as follows:

a.Welding

When the electrode touches the work, the welding arc is initiated and the engine accelerates to full speed.

After welding ceases (and no auxiliary power is being drawn), the engine will return to low idle after approximately 10 to 14 seconds.

b.Auxiliary Power

ENGINE PROTECTION SYSTEM

The engine protection system shuts down the engine under high coolant temperature or low engine oil pres- sure conditions by allowing the fuel solenoid valve to close.

AIR INTAKE SHUT-OFF

The air intake shut-off is a automatic/manually device which blocks all intake air from entering the engine.

The automatic feature of the shut-off will engage should excessive over speeding occur. The valve is calibrated at the factory to shutdown within the safety

To manually shut down the engine, simply pull the emergency stop handle on the lower control panel.

The air intake shut-off device will reset automatically, generally within one minute.

WARNING

• Muffler and Engine may be hot!

With the engine running at low idle and auxiliary power for lights or tools is drawn (approximately 100-150 watts or greater) from the receptacles, the engine will accelerate to high speed. If no power is being drawn from the receptacles ( and not weld- ing) for 10-14 seconds, the idler reduces the engine speed to low idle.

ENGINE TEMPERATURE GAUGE

Displays the coolant temperature in the engine block.

ENGINE OIL PRESSURE GAUGE

Displays the oil pressure to the engine. When the engine starts running, watch for the oil pressure to build up. If no pressure shows within 30 seconds, stop the engine and consult the engine instruction manual.

BATTERY CHARGING AMMETER

Displays the current going from the charging alterna- tor into the batteries. It is normal for charging current to be high (above 15 amps) after starting or when the batteries are ʻlowʼ on charge.

ENGINE HOUR METER

The engine hour meter records the total running time on the engine in hours. It can be used to keep a record of maintenance on the engine and or welder.

IMPORTANT: Before restarting engine, verify that the air intake shut-off is in the open position. DO NOT ATTEMPT TO START ENGINE WITH THE AIR INTAKE SHUT-OFF IN THE CLOSED POSITION. This may cause severe damage to the engine.

SAE-400 SEVERE DUTY

IM870-A specifications

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OPERATION

ENGINE CONTROLS