Generac 4582, 4451 Automatic Idle Control, Cold Weather OPERATION/ DE-ICER, Stopping the Engine

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Section 2 — Operation

Commercial-Industrial-Residential Portable Generator System

• Move engine CHOKE knob to “Full Choke” position.

Figure 17 - Full Choke Position

To start engine, press and hold the Start/Run/Stop switch in the “Start” position. The engine will crank and attempt to start. When the engine starts, release the switch to the run position.

When the engine starts, move choke knob to “1/2 Choke” position until the engine runs smoothly and then to “Run” position. If engine falters, move choke knob to “1/2 Choke” position until the engine runs smoothly and then to “Run” position.

Note: If engine fires, but does not continue to run, move choke lever to “Full Choke” and repeat starting instructions.

2.9 AUTOMATIC IDLE CONTROL

This feature is designed to greatly improve fuel economy. When this switch is turned On,” the engine will only run at its normal fast governed engine speed when electrical load is connected. When the load is removed, the engine will run at a reduced speed of 2100 RPM. With the switch Off,” the engine runs at the normal fast engine speed all the time. Always have the switch OFF when starting and stopping the engine.

2.10COLD WEATHER OPERATION/ DE-ICER

Under certain weather conditions (temperatures below 40° F (4°

C)and a high dew point), the engine may experience icing of the carburetor and/or the crankcase breather system. To eliminate this problem, this generator engine is fitted with a winter/summer valve. this directs hot air into the carburetor during cold weather operation. Always make sure the winter/summer valve is in the correct location relative to the weather conditions.

2.11LOW OIL PRESSURE SHUTDOWN SYSTEM

The engine is equipped with a low oil pressure sensor that shuts down the engine automatically when the oil pressure drops below 10 psi. If the engine shuts down by itself and the fuel tank has enough gasoline, check engine oil level.

2.8 STOPPING THE ENGINE

Shut off all loads, then unplug the electrical loads from generator panel receptacles. Never start or stop the engine with electrical devices plugged in and turned on.

Turn “Off” the Idle Control switch (if on).

Let engine run at no-load for several minutes to stabilize the internal temperatures of engine and generator.

Move Start/Run/Stop switch to “Off” position.

Close fuel valve.

IMPORTANT: Do not overload the generator. Also, do not overload individual panel receptacles. These outlets are protected against overload with push-to-reset-type circuit breakers. If amperage rating of any circuit breaker is exceeded, that breaker opens and electrical output to that receptacle is lost. Read “Don’t Overload the Generator” on page 9 carefully.

2.11.1 INITIAL START-UP

A delay built into the low oil shutdown system allows oil pressure to build during starting. The delay allows the engine to run for about 10 seconds before sensing oil pressure.

2.11.2 SENSING LOW OIL PRESSURE

If the system senses low oil pressure during operation, the engine shuts down.

2.11.3 RESTARTING

If you try to restart the engine within 10 seconds after it shuts down, the engine may NOT start. The system needs 5 to 10 seconds to reset.

If you do restart the engine after such a shutdown and have not corrected the low oil pressure, the engine runs for about 10 seconds as described above and then stops.

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Contents Owner’s Manual Safety Rules General Information Introduction Important Safety Instructions General HazardsFire Hazards Electrical HazardsExplosion Hazards Unpacking AssemblyAccessory BOX Assembling the Wheel KITBattery Connection Handle AssemblyOperation Know the Generator2 120V AC, 20 AMP, Gfci Receptacle Cord Sets and Connection Plugs1 AC, 20 AMP, Duplex Receptacle 5 12 Volt DC, 10 AMP Receptacle Provided. This receptacle can not recharge 6 Volt batteriesDON’T Overload the Generator HOW to USE the GeneratorConnecting Electrical Loads Grounding the GeneratorAdding Engine OIL Wattage Reference GuideBefore Starting the Generator To Start the Engine Adding GasolineLOW OIL Pressure Shutdown System Automatic Idle ControlCold Weather OPERATION/ DE-ICER Stopping the EngineCharging a Battery To recharge 12 Volt batteries, proceed as followsGenerator Specifications Maintenance ScheduleProduct Specifications Engine SpecificationsGeneral Recommendations Replacing the Spark Plug Service AIR CleanerClean Spark Arrestor Screen Adjusting Valve Clearance To adjust valve clearanceOther Storage Tips Storage GeneralLong Term Storage Troubleshooting Commercial-Industrial-Residential Portable Generator System Commercial-Industrial-Residential Portable Generator System Wiring Diagram Drawing No E0228 Schematic Drawing No E0229-A GT-990 & GT-760 Engine Page 1 Drawing No E8589E Item Part NO. QTY. Description GT-990 & GT-760 Engine Page 2 Drawing No E8589E QTY Description Generator Drawing No D4488-D QTY. Description Control Panel Drawing No E0227B Part NO. QTY. Description Frame, Handle & Wheel Kit Drawing No E0695-A QTY Description California Emission Control Warranty Statement Emission Control System Warranty Warranty Schedule Generac Power SYSTEMS, INC. P.O. Box 297 Whitewater, WI