Generac Power Systems 04759-0, 04758-0, 04760-0 Adjusting Valve Clearance, Cooling System

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Section 4 — Maintenance

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

4.8 ADJUSTING VALVE CLEARANCE

After the first 50 hours of operation, you should adjust the valve clearance in the engine.

Important: If you feel uncomfortable about doing this procedure or you don't have the proper tools, please contact your Generac Authorized dealer for service assistance. This is a very important step to insure longest life for your engine.

To adjust valve clearance:

•Make sure the engine is at room temperature.

•Make sure that the spark plug wire is removed from the spark plug and out of the way.

•Remove the four screws attaching the valve cover with a #2 or #3 phillips screwdriver.

•Make sure the piston is at Top Dead Center (TDC) of its compression stroke (both valves closed). To get the piston at TDC, remove the intake screen at the front of the engine to gain access to the flywheel nut. Use a large socket and socket wrench to rotate the nut and hence the engine. While watching the piston through the spark plug hole. The piston should move up and down. The piston is at TDC when it is up as high as it can go.

•Loosen the rocker jam nut. Use an 10mm allen wrench to turn the pivot ball stud while checking clearance between the rocker arm and the valve stem with a feeler gauge. Correct clearance is 0.002-0.004 inch (0.05-0.1 mm).

NOTE:

You must hold the rocker arm jam nut in place as you turn the pivot ball stud.

When valve clearance is correct, hold the pivot ball stud in place with the allen wrench and tighten the rocker arm jam nut. Tighten the jam nut to 174 in/lbs. torque. After tightening the jam nut, recheck valve clearance to make sure it did not change.

Figure 4.10 - Valve Clearance Adjustment

Rocker

Pivot BallArm

Stud

Jam Nut

Valve

Stem

•Install new valve cover gasket.

•Re-attach the valve cover. NOTE:

Start all four screws before tightening or you will not be able to get all the screws in place. Make sure the valve cover gasket is in place.

•Re-attach the spark plug wire to the spark plug.

•Repeat the process for the other cylinder.

4.9COOLING SYSTEM

Air inlet and outlet openings in the generator compart- ment must be open and unobstructed for continued proper operation. This includes such obstructions as high grass, weeds, brush, leaves and snow.

Without sufficient cooling and ventilating air flow, the engine/generator quickly overheats, which causes it to quickly shut down. (See Figure 4.9 for vent locations.)

Figure 4.9 – Cooling Vent Locations

The exhaust from this product gets extremely hot and remains hot after shutdown. High grass, weeds, brush, leaves, etc. must remain clear of the exhaust. Such materials may ignite and burn from the heat of the exhaust system.

The maximum ambient temperature for your

!generator is 48.9° C (104° F).

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Contents Installation Introduction Troubleshooting Post Installation Start-up AdjustmentsMaintenance Introduction Inside Front CoverGeneral Hazards Electrical Hazards ‹ Standards IndexProtection Systems UNPACKING/INSPECTIONSystem SET LED Your Generator 7 kW, Single Cylinder GH-410 Engine‹ 1.5.1 Generator Specifications‹ 1.5.2 Engine Fuel Consumption Reconfiguring the Fuel SystemFuel Requirements Recommendations 2 12KW and 15KW, 990CC EnginesGenerator Transfer SwitchLocation 2.1 7 kW, 12 kW and 15 kW UnitsBattery Installation BatteryBefore Initial START-UP Check Transfer Switch OperationElectrical Checks Generator Tests Under Load Checking Automatic OperationEngine Governor Adjustment Adjusting the Regulator Natural GAS only1 7 KW Units BREAK-IN Procedure Voltage Regulator Adjustment2 12 KW and 15 KW Units ‹ 3.2.1 Auto Position Automatic Transfer OperationSequence of Automatic Operation ‹ 3.2.2 OFF Position‹ 3.5.2 Transfer Back to Utility Power Source Manual Transfer Operation‹ 3.7.2 High Temperature Switch Setting the Exercise Timer‹ 3.7.1 LOW OIL Pressure Switch ‹ 3.7.3 OvercrankChanging the Engine OIL Checking the Engine OIL Level‹ 4.3.1 Engine OIL Recommendations Changing the OIL Filter ‹ 4.3.2 OIL Change Procedure‹ 4.5.1 7 KW, 12 KW and 15 KW Generators Battery Maintenance Spark PlugsAdjusting Valve Clearance Cooling System‹ 4.12.1 Removal from Service OUT of Service Procedure‹ 4.12.2 Return to Service Corrosion ProtectionService Schedule Be performed by your nearest Generac Authorized DealerTroubleshooting Guide Problem Cause CorrectionElectrical Data Customer Connection SM Starter Motor 1VA Engine Wiring Control Panel BOX SP Spark Plug Customer Connections Exploded Views and Parts Lists Part NO. QTY Description Exploded Views and Parts Lists Part NO. QTY. Description Kit Contains QTY Description 122 138 125 139 136 135 123 120 137 124 133 119 117 114 121 QTY Description 45 30 ADAPTOR, Engine Exploded Views and Parts Lists Stator 12KW 40 22 ASSEMBLY, Connecting ROD Exploded Views and Parts Lists SCREW, Taptite M6-1.0X8 Yellow Chrome For GT 760 Engine only CASTING, Twin Regulator Housing Mounting Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators California and Federal Emission Control Warranty Statement Emission Control System Warranty Warranty Schedule This Warranty Shall not Apply to the Following

04760-0, 04759-0, 04758-0 specifications

Generac Power Systems is a leading manufacturer in the field of power generation, known for its innovative products that cater to both residential and commercial customers. Among its prominent offerings, the Generac models 04758-0, 04759-0, and 04760-0 stand out as essential solutions for backup energy needs. These units offer reliable power during outages, ensuring that homes and businesses remain operational regardless of external conditions.

The Generac 04758-0 is a robust standby generator designed for residential use. Featuring a powerful engine, it delivers a dependable power output when it is needed most. Key characteristics include an automatic transfer switch that detects power loss and activates the generator without user intervention. This means that homeowners can enjoy peace of mind knowing that their essential appliances and systems will continue to function seamlessly during outages. Additionally, its compact design allows for easy installation in most home settings.

Moving on to the Generac 04759-0, this model offers even greater power capacity, making it suitable for larger homes or small businesses. It incorporates advanced technologies such as digital power management, which optimizes fuel efficiency and reduces emissions. The O47-59-0 is also known for its durable construction, providing reliable performance in various weather conditions. Its user-friendly interface allows for straightforward operation and monitoring, ensuring users remain informed about their power status.

The Generac 04760-0 takes it a step further by enhancing its overall performance with innovations in noise reduction and fuel consumption. It is engineered with a leading-edge cooling system that minimizes operational noise, making it ideal for residential neighborhoods where sound regulations are a concern. This model is also compatible with a variety of fuels, giving users flexibility based on availability and cost. Its comprehensive warranty further underscores Generac's commitment to customer satisfaction and product reliability.

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