Generac Power Systems 04758-2, 04759-2, 04760-2 Engine Governor Adjustment, 2.7.1 7 KW UNITS

Page 15

Section 2 — Post Installation Start-up and Adjustments

Section 2 — Post Installation Start-up and Adjustments

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

If this procedure or equipment are not available, locate the nearest Generac Guardian Dealer and they can perform the adjustments.

NOTE:

A service fee may be charged for this adjustment.

◆2.7.2 12 KW AND 15 KW UNITS

1.Loosen governor clamp bolt (See Figure 2.4).

Figure 2.4 — V-twin Engine Governor

Adjustment

2.7ENGINE GOVERNOR ADJUSTMENT

If both AC frequency and voltage are correspondingly high or low, adjust the engine governor as follows:

◆2.7.1 7 KW UNITS

1.Loosen the governor clamp bolt (Figures 2.3 and 2.4).

2.Hold the governor lever at its wide open throttle position, and rotate the governor shaft clockwise as far as it will go. Then, tighten the governor lever clamp bolt to 70 inch-pounds (8 N-m).

3.Start the generator; let it stabilize and warm up at no-load.

4.Connect a frequency meter across the generators AC output leads.

5.Turn the speed adjust nut to obtain a frequency reading of 63 Hz.

6.When frequency is correct at no load, check the AC voltage reading. If voltage is incorrect, the volt- age regulator may require adjustment.

Figure 2.3 — Single Cylinder Engine Governor

Adjustment

GOVERNOR

SHAFT

	GOVERNOR	ADJUST
	CLAMP
		SCREW
	BOLT

Idle Spring

Governor

Shaft

(Rotate

Clockwise)

	Governor Clamp Bolt	No Load Idle
	Governor Clamp Bolt	Adjustment Screw
		Adjustment Screw

2.Completely remove the idle spring.

3.With governor arm at wide open throttle position, rotate governor shaft fully clockwise. Tighten clamp bolt to 84 inch-pounds.

4.Start unit and apply full load. Use full load speed adjust screw (Figure 2.5) to adjust frequency to 58 Hz.

5.Remove load, stop engine, loosen the idle adjust screw and reconnect the idle spring.

6.Using a hand, push the governor arm to the closed throttle position. Make sure the idle spring does not stretch at all.

7.Restart the unit.

8.Slowly turn the idle adjust screw to adjust the no- load idle frequency to 63-63.5 Hz.

9.The governor is now set.

Figure 2.5 — V-twin Full Load Speed Adjust

Screw

Full Load Speed Adjust Screw

Generac® Power Systems, Inc. 13

Image 15

Contents Installation and Owner’s Manual Models 04758-2 6 kW NG, 7 kW LP 04759-2 12 kW NG, 12 kW LP04760-2 13 kW NG, 15 kW LP This manual should remain with the unitINTRODUCTION ‹ CONTENTS‹ OPERATION AND MAINTENANCE ‹ HOW TO OBTAIN SERVICEIntroduction during operation. Exercise care near running generators GENERAL HAZARDSDespite the safe design of this generator Parts of the generator are rotating and/or hot‹ STANDARDS INDEX ELECTRICAL HAZARDSFIRE HAZARDS EXPLOSION HAZARDSDANGER 1.1 UNPACKING/INSPECTION1.2 PROTECTION SYSTEMS 1.3 SYSTEM SET LED1.4 THE GENERATOR Figure 1.1 - 7 kW, Single Cylinder GH-410 EngineFigure 1.2 - 12 kW/15 kW, V-twin GT-990/760 Engine 1.5 SPECIFICATIONS ‹ 1.5.1 GENERATOR‹ 1.5.2 ENGINE DANGER 1.8 RECONFIGURING THE FUEL SYSTEM1.6 FUEL REQUIREMENTS AND RECOMMENDATIONS 1.7 FUEL CONSUMPTIONFigure 1.4 - Demand Regulator 1.9 LOCATION1.8.2 12KW AND 15KW, 990CC ENGINES 1.9.1 GENERATORFigure 1.5 - Battery Cable Connections 1.10 BATTERY INSTALLATION1.11 THE BATTERY 1.9.2 TRANSFER SWITCH 1.9.2.1 7 kW, 12 kW and 15 kW Units2.2 CHECK TRANSFER SWITCH OPERATION 2.1 BEFORE INITIAL START-UP2.3 ELECTRICAL CHECKS 2.5 CHECKING AUTOMATIC OPERATION 2.4 GENERATOR TESTS UNDER LOAD2.6 ADJUSTING THE REGULATOR NATURAL GAS ONLY Figure 2.2 - Placement of RegulatorFigure 2.1 - Dual Fuel Regulators Figure 2.5 - V-twin Full Load Speed Adjust Screw 2.7 ENGINE GOVERNOR ADJUSTMENTFigure 2.4 - V-twin Engine Governor Adjustment Figure 2.3 - Single Cylinder Engine Governor AdjustmentFigure 2.6 - Voltage Adjustment Potentiometer 2.8 VOLTAGE REGULATOR ADJUSTMENT3.1 BREAK-IN PROCEDURE 3.2 USING THE AUTO/OFF/MANUAL SWITCH FIGURE‹ 3.5.1 TRANSFER TO GENERATOR POWER SOURCE 3.3 AUTOMATIC TRANSFER OPERATION3.5 MANUAL TRANSFER OPERATION 3.4 SEQUENCE OF AUTOMATIC OPERATIONFigure 3.2 - Manual Transfer Switch Operation ‹ 3.5.2 TRANSFER BACK TO UTILITY POWER SOURCE‹ 3.7.1 LOW OIL PRESSURE SWITCH ‹ 3.7.2 HIGH TEMPERATURE SWITCH‹ 3.7.3 OVERCRANK Figure 3.3 - Low Oil Pressure and High Temperature Switches4.2 CHECKING THE ENGINE OIL LEVEL 4.1 FUSE4.4 CHANGING THE OIL FILTER 4.5 CHANGING THE ENGINE AIR CLEANER‹ 4.3.2 OIL CHANGE PROCEDURE 4.3 CHANGING THE ENGINE OILFigure 4.8 - Setting the Spark Plug Gap 4.7 BATTERY MAINTENANCEFigure 4.6 - 7 kW, Engine Air Cleaner Location Figure 4.7 - 12 kW and 15 kW Engine Air Cleaner4.8 ADJUSTING VALVE CLEARANCE Figure 4.10 - Valve Clearance Adjustment4.9 COOLING SYSTEM 4.10 ATTENTION AFTER SUBMERSION 4.12 OUT OF SERVICE PROCEDURE‹ 4.12.2 RETURN TO SERVICE ‹ 4.12.1 REMOVAL FROM SERVICE4.13 SERVICE SCHEDULE CORRECTION 5.1 TROUBLESHOOTING GUIDEPROBLEM CAUSE24 Generac Power Systems, Inc ENGINE WIRINGSection 6 - Electrical Data CONTROL PANEL BOX CUSTOMERCONNECTION 26 Generac Power Systems, Inc Electrical Schematic - 12 & 15 kW - Drawing No. 0D8501-BSection 6 - Electrical Data Section 6 - Electrical Data 28 Generac Power Systems, IncCUSTOMER 30 Generac Power Systems, Inc 225A224A Electrical Schematic - 7 kW - Drawing No. 0D9014-C 32 Generac Power Systems, Inc Section 7 - Exploded Views and Parts ListsPART NO. QTY. DESCRIPTION 34 Generac Power Systems, Inc Section 7 - Exploded Views and Parts Lists 36 Generac Power Systems, Inc 27, 2835, 36, 40 DESCRIPTION PART NO. QTY38 Generac Power Systems, Inc Section 7 - Exploded Views and Parts Lists 14 20 40 Generac Power Systems, Inc1.25 FT 1.8 FT42 Generac Power Systems, Inc 2.6 FT 3 FT1.33 FT 44 Generac Power Systems, Inc DESCRIPTION 46 Generac Power Systems, Inc DESCRIPTION 48 Generac Power Systems, Inc DESCRIPTION Guardian Air-cooled 7 kW, 12 Drawing No. 0D3739-B 50 Generac Power Systems, IncALL DIMENSIONS IN MILLIMETERS INCHES Section 8 - MountingSection 9 - Notes CALIFORNIA AND FEDERAL EMISSION CONTROL WARRANTY STATEMENT YOUR WARRANTY RIGHTS AND OBLIGATIONSMANUFACTURER’S EMISSION CONTROL SYSTEM WARRANTY COVERAGE PURCHASER’S/OWNER’S WARRANTY RESPONSIBILITIESEMISSION RELATED PARTS INCLUDE THE FOLLOWING EMISSION CONTROL SYSTEM WARRANTYTHIS WARRANTY SHALL NOT APPLY TO THE FOLLOWING GENERAC POWER SYSTEMS TWO YEAR LIMITED WARRANTY FOR GUARDIANPREPACKAGED EMERGENCY AUTOMATIC STANDBY GENERATORS WARRANTY SCHEDULE