Generac 04389-1, 04456-1, 04390-1 owner manual 4.9COOLING SYSTEM, Attention After Submersion

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Figure 4.10 - Valve Clearance Adjustment

Section 4 — Maintenance

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

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.

On GT-990, Repeat the process for the other cylinder.

4.9COOLING SYSTEM

Air inlet and outlet openings in the generator com- partment must be open and unobstructed for contin- ued proper operation. This includes such obstruc- tions 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 40° C (104° F).

4.10 ATTENTION AFTER SUBMERSION

If the generator has been submerged in water, it MUST NOT be started and operated. Following any submersion in water, have a Generac/Guardian Authorized Dealer thoroughly clean and dry the gener- ator.

4.11 CORROSION PROTECTION

Periodically wash and wax the enclosure using auto- motive type products. Frequent washing is recom- mended in salt water/coastal areas. Spray engine linkages with a light oil such as WD-40.

20 Generac® Power Systems, Inc.

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Contents POWER SYSTEMS POWER SYSTEMS, INCDEADLY EXHAUST FUMES. OUTDOOR INSTALLATION ONLY DANGERDANGER INTRODUCTIONAUTHORIZED DEALER LOCATION ‹CONTENTSIntroduction Despite the safe design of this generator GENERAL HAZARDSParts of the generator are rotating and/or hot EXPLOSION HAZARDS ELECTRICAL HAZARDSFIRE HAZARDS ‹STANDARDS INDEX1.2PROTECTION SYSTEMS 1.1UNPACKING/INSPECTION1.3SYSTEM SET LED Figure 1.1 - 7 kW, Single Cylinder GH-410Engine 1.4YOUR GENERATORFigure 1.2 - 12 kW and 15 kW, V-twin GT-990Engine ‹ 1.5.1 GENERATOR 1.5 SPECIFICATIONS‹1.5.2 ENGINE 1.7FUEL CONSUMPTION 1.8RECONFIGURING THE FUEL SYSTEM1.6FUEL REQUIREMENTS AND RECOMMENDATIONS DANGER1.9.2 TRANSFER SWITCH 1.10 BATTERY INSTALLATION1.9LOCATION 1.9.1 GENERATORWear rubber gloves and boots 1.11 THE BATTERYFigure 1.5 - Battery Cable Connections Do not open or mutilate the battery. Released2.3ELECTRICAL CHECKS 2.2CHECK TRANSFER SWITCH OPERATION2.1BEFORE INITIAL START-UP Never operate the engine with the oil level2.4GENERATOR TESTS UNDER LOAD 2.6ADJUSTING THE REGULATOR NATURAL GAS ONLY2.5CHECKING AUTOMATIC OPERATION Figure 2.3 - Engine Governor Adjustment 2.7ENGINE GOVERNOR ADJUSTMENTFigure 2.2 - Placement of Regulator Do not make any unnecessary adjustmentsFigure 2.4 - Full Load Speed Adjust Screw 2.8VOLTAGE REGULATOR ADJUSTMENT3.1BREAK-INPROCEDURE Figure 2.5 - Voltage Adjustment PotentiometerWith the switch set to AUTO, the engine may 3.3AUTOMATIC TRANSFER OPERATION3.2USING THE AUTO/OFF/MANUAL SWITCH FIGURE 3.4SEQUENCE OF AUTOMATIC OPERATION‹3.5.2 TRANSFER BACK TO UTILITY POWER SOURCE 3.6SETTING THE EXERCISE TIMER3.5MANUAL TRANSFER OPERATION Figure 3.2 - Manual Transfer Switch Operation‹3.7.1 LOW OIL PRESSURE SWITCH 3.7PROTECTION SYSTEMS4.1FUSE ‹3.7.2 HIGH TEMPERATURE SWITCH‹ 4.3.2 OIL CHANGE PROCEDURE 4.2CHECKING THE ENGINE OIL LEVEL4.3CHANGING THE ENGINE OIL ‹4.3.1 ENGINE OIL RECOMMENDATIONS4.6SPARK PLUGS 4.5CHANGING THE ENGINE AIR CLEANER4.4CHANGING THE OIL FILTER Figure 4.6 - 7 kW, Engine Air Cleaner Location4.8ADJUSTING GH-410/GT-990VALVE CLEARANCE 4.7BATTERY MAINTENANCEFigure 4.8 - Setting the Spark Plug Gap 4.11 CORROSION PROTECTION 4.9COOLING SYSTEM4.10 ATTENTION AFTER SUBMERSION Figure 4.10 - Valve Clearance Adjustment‹4.12.1 REMOVAL FROM SERVICE 4.12 OUT OF SERVICE PROCEDURE‹4.12.2 RETURN TO SERVICE 4.13 SERVICE SCHEDULE CAUSE 5.1TROUBLESHOOTING GUIDEPROBLEM CORRECTION24 Generac Power Systems, Inc Section 6 - Electrical DataCUSTOMER CONTROL PANEL BOXCONNECTION 26 Generac Power Systems, Inc C2-6 Wiring Diagram - 7 kW - Drawing No. 0D9013-A 28 Generac Power Systems, IncCUSTOMER CONNECTION CLOSEST TO BEA 4 0 STATOR30 Generac Power Systems, Inc Section 6 - Electrical Data Section 7 - Exploded Views and Parts Lists 32 Generac Power Systems, IncPART NO.QTY. DESCRIPTION Control Panel - Drawing No. 0D8503-E DESCRIPTION Section 7 - Exploded Views and Parts Lists 0D4801 37 17 24 0D3086 Kit Contains DESCRIPTION 42 Generac Power Systems, Inc DESCRIPTION 44 Generac Power Systems, Inc 7 kW Generator - Drawing No. 0D3504-B 46 Generac Power Systems, Inc 12 kW and 15 kW Generator - Drawing No. 0D3417-B 48 Generac Power Systems, Inc GN410 Engine - Drawing No. 0D3539-BPart 50 Generac Power Systems, Inc 0C1069 PART NO. QTY Guardian Air Section 8 - Mounting DimensionsTRANSFER SWITCH NTAKE54 Generac Power Systems, Inc Generac Power Systems, Inc PURCHASER’S/OWNER’S WARRANTY RESPONSIBILITIES CALIFORNIA EMISSION CONTROL WARRANTY STATEMENTYOUR WARRANTY RIGHTS AND OBLIGATIONS Section 10 - WarrantyEMISSION CONTROL SYSTEM WARRANTY EMISSION RELATED PARTS INCLUDE THE FOLLOWINGGENERAC POWER SYSTEMS, INC WARRANTY SCHEDULEP.O. BOX WHITEWATER, WI