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Generac Power Systems 55, 75, 65 manual 49.– Fuel Solenoid, Section DIAGNOSTIC TESTS

Models: 65 75 55

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Section 7

DIAGNOSTIC TESTS

SHORT TO GROUND:

Set VOM to measure resistance. Disconnect Wire 14A from the LPG Fuel Solenoid. Connect one meter test lead to LPG Fuel Solenoid. terminal that Wire 14A was just removed from. Connect the other meter test lead to a clean frame ground. LPG Fuel Solenoid. coil resistance of approximately 30-32 ohms Should be measured. Current draw of the LPG Fuel Solenoid at nominal voltage Is approximately 380 milliamps or 0.380 amps.

RESULTS:

1. If the solenoid energized in Step 1, proceed to Test 32.

2. If “Continuity” was not measured in Step 2 repair or replace Wire 0 between the LPG Fuel Solenoid (FS) and the Ground Terminal (GT) in the control panel.

3.If “Continuity” was measured in Step 2, repair or replace the Fuel Solenoid (FS).

Figure 7-49. – Fuel Solenoid

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Generac Power Systems 55, 75, 65 manual 49.– Fuel Solenoid, Section DIAGNOSTIC TESTS

Contents

QUIETPACT 55/65/75 Diagnostic Repair ManualRECREATIONAL VEHICLE GENERATOR Model 4702, 4703, 4707, 4705, 4706,SAFETY REPLACEMENT PARTSNOTICE TO USERS OF THIS MANUAL Table of Contents SECTION Table of ContentsMAGNETISM Section GENERATOR FUNDAMENTALSELECTROMAGNETIC FIELDS ELECTROMAGNETIC INDUCTIONA MORE SOPHISTICATED AC GENERATOR A SIMPLE AC GENERATORFigure 1-5.– Alternating Current Sine Wave Figure 1-6.– A More Sophisticated GeneratorSection GENERATOR FUNDAMENTALS Figure 1-7.- Generator Operating DiagramFIELD BOOST GENERATOR AC CONNECTION SYSTEMSection GENERATOR FUNDAMENTALS Section GENERATOR FUNDAMENTALS Figure 1-8.– Connection for 120 Volts OnlySTATOR ASSEMBLY ROTOR ASSEMBLYSection MAJOR GENERATOR COMPONENTS Figure 2-1.Exploded View of GeneratorFigure 2-4.– Battery Charge Circuit BATTERY CHARGE COMPONENTSFigure 2-5.– Schematic: Excitation Circuit BRUSH HOLDERCRANKCASE BREATHER Figure 2-6.– Excitation Circuit BreakerSection MAJOR GENERATOR COMPONENTS CONTROL PANEL COMPONENT IDENTIFICATION Figure 2-9.– Control Panel ComponentsSection MAJOR GENERATOR COMPONENTS Section INSULATION RESISTANCE TESTS CLEANING THE GENERATOREFFECTS OF DIRT AND MOISTURE INSULATION RESISTANCE TESTERSSection INSULATION RESISTANCE TESTS STATOR INSULATION RESISTANCETHE MEGOHMMETER TESTING ROTOR INSULATIONFigure 3-2.– Stator Leads Figure 3-3.– Rotor Test PointsMETERS Section MEASURING ELECTRICITYTHE VOM MEASURING AC VOLTAGEMEASURING CURRENT MEASURING AC FREQUENCYMEASURING RESISTANCE Figure 4-3.– A Line-SplitterOHMS LAW ELECTRICAL UNITSFigure AMPERES = VOLTSOHMSSection ENGINE DC CONTROL SYSTEM INTRODUCTIONOPERATIONAL ANALYSIS Section ENGINE DC CONTROL SYSTEM CIRCUIT CONDITION- PRIMINGPage CIRCUIT CONDITION- CRANKING Section ENGINE DC CONTROL SYSTEMCIRCUIT CONDITION-RUNNING Section ENGINE DC CONTROL SYSTEMCIRCUIT CONDITION- SHUTDOWN Section ENGINE DC CONTROL SYSTEMSection ENGINE DC CONTROL SYSTEM CIRCUIT CONDITION- FAULT SHUTDOWNENGINE CONTROLLER CIRCUIT BOARD BATTERYFigure 5-3.– Engine Controller Circuit Board Figure 5-2.- Receptacle J1START-STOPSWITCH FUEL PRIMER SWITCHFigure 5-5.– Primer Switch 7.5 AMP FUSESection ENGINE DC CONTROL SYSTEM Figure 5-6.– Start-StopSwitchSTARTER CONTACTOR RELAY & STARTER MOTORINTRODUCTION Section TROUBLESHOOTING FLOWCHARTSPage Section TROUBLESHOOTING FLOWCHARTSPage Section TROUBLESHOOTING FLOWCHARTSPage Section TROUBLESHOOTING FLOWCHARTSPage Section TROUBLESHOOTING FLOWCHARTSPage Section TROUBLESHOOTING FLOWCHARTSPage Section TROUBLESHOOTING FLOWCHARTSPage Section TROUBLESHOOTING FLOWCHARTSPage Section TROUBLESHOOTING FLOWCHARTSPage Section TROUBLESHOOTING FLOWCHARTSPage Section TROUBLESHOOTING FLOWCHARTSFigure 7-1.– Governor Adjustment Points Section DIAGNOSTIC TESTSTEST 1- CHECK NO-LOADVOLTAGE AND FREQUENCY TEST 2- CHECK ENGINE GOVERNORTEST 4- FIXED EXCITATION TEST/ROTOR AMP DRAW TEST 3- TEST EXCITATION CIRCUIT BREAKERFigure 7-2.– Excitation “DPE” Circuit Breaker Figure 7-3.- Fixed Excitation TestSection DIAGNOSTIC TESTS TEST 5- WIRE CONTINUITYTEST 7 - TEST STATOR DPE WINDING TEST 6- CHECK FIELD BOOSTFigure 7-4.- The Field Boost Circuit Figure 7-5.– Stator Excitation WindingSection DIAGNOSTIC TESTS TEST 8- CHECK SENSING LEADS / POWER WINDINGSTEST 9- CHECK BRUSH LEADS Figure 7-6.– Stator Power Winding LeadsTEST 10 - CHECK BRUSHES & SLIP RINGS Figure 7-7.– Brush LeadsFigure 7-8.– Rotor Assembly TEST 11- CHECK ROTOR ASSEMBLYTEST 12 - CHECK MAIN CIRCUIT BREAKER Figure 7-9.– Main Breaker TypicalTEST 16 - CHECK BATTERY CHARGE RECTIFIER TEST 15 - CHECK BATTERY CHARGE OUTPUTTEST 13- CHECK LOAD VOLTAGE & FREQUENCY TEST 14- CHECK LOAD WATTS & AMPERAGEWINDINGS / BATTERY CHARGE RESISTOR TEST 17 - CHECK BATTERY CHARGEFigure 7-10.- Battery Charge Rectifier Section DIAGNOSTIC TESTSFigure 7-11.– Primer Switch TEST 19- TEST PRIMER SWITCHFigure 7-12.– Harness End of Connector TEST 18 - TRY CRANKING THE ENGINEFigure 7-13.- The LPG Fuel Solenoid FS TEST 20- CHECK FUEL PUMPFigure 7-14.– Electric Fuel Pump Section DIAGNOSTIC TESTSTEST 23- CHECK POWER SUPPLY TO CIRCUIT BOARD TEST 22- CHECK BATTERY & CABLESTEST 21- CHECK 7.5 AMP FUSE Figure 7-15.– Harness to Fuel PumpFigure 7-17.- Start-StopSwitch TEST 24 - CHECK START-STOPSWITCHFigure 7-18.– Test 24, Step Section DIAGNOSTIC TESTSTEST 26- CHECK STARTER CONTACTOR RELAY TEST 25 - CHECK POWER SUPPLY TO WIREFigure 7-19.– Starter Contactor Relay Section DIAGNOSTIC TESTSTEST 27 - CHECK STARTER MOTOR TEST 26A - CHECK STARTER CONTACTORFigure 7-20.– The Starter Contactor SC STEP 1 TEST POINTFigure 7-21.- Starter Motor SM Figure 7-22.- Check Pinion Gear OperationSection DIAGNOSTIC TESTS TEST 28- CHECK FUEL SUPPLY Figure 7-26.– Testing Starter Motor PerformanceFigure 7-24.– Tachometer Section DIAGNOSTIC TESTSFigure 7-28– LP Gas Carburetion Diagram Figure 7-27- Typical Propane Gas Fuel SystemSection DIAGNOSTIC TESTS TEST 30 - CHECK WIRE TEST 29 - CHECK WIRE 14 POWER SUPPLYFigure 7-30.– The 4-tabConnector Figure 7-29.– Fuel RegulatorTEST 31 - CHECK FUEL SOLENOID GASOLINE MODELS Figure 7-31.– Remote Harness ConnectorTEST 32 - CHECK IGNITION SPARK Section DIAGNOSTIC TESTSFigure 7-33.– Checking Engine Miss Figure 7-32.– Testing Ignition SystemFigure 7-34.– Cylinder Balance Test Section DIAGNOSTIC TESTSFigure 7-35– Setting Spark Plug Gap TEST 34 - CHECK AND ADJUST IGNITION MAGNETOSFigure 7-36.– Ignition Magneto Assembly TEST 33 - CHECK SPARK PLUGSArmature Air Gap Figure 7-37.– Setting Ignition MagnetoFigure 7-38.– Engine Ground Harness Figure 7-39.– Diode Failure DiagnosisFigure 7-41– Adjusting Valve Clearance TEST 35 - CHECK VALVE ADJUSTMENTFigure 7-40.- Engine Ground Harness Test Points Section DIAGNOSTIC TESTSTEST 37 - CHECK CHOKE SOLENOID TEST 36 - CHECK CARBURETIONFigure 7-42- Tightening the Jam Nut Section DIAGNOSTIC TESTSFigure 7-44.– Exploded View of Choke Assembly Figure 7-43.- ConnectorFigure 7-45.– Automatic Choke Assembly Section DIAGNOSTIC TESTSDOWN TEST / COMPRESSION TEST TEST 38 - CHECK ENGINE / CYLINDER LEAKSection DIAGNOSTIC TESTS TEST 40 - TEST OIL TEMPERATURE SWITCH TEST 39 - CHECK OIL PRESSURE SWITCHFigure 7-46.– Oil Pressure Switch Figure 7-47.– Oil Temperature SwitchTEST 41 - TEST CHOKE HEATER Figure 7-48.– Testing Oil Temperature SwitchTEST 42 - CHECK LPG FUEL SOLENOID Section DIAGNOSTIC TESTSSection DIAGNOSTIC TESTS Figure 7-49.– Fuel SolenoidMAJOR DISASSEMBLY Section ASSEMBLYSection ASSEMBLY Figure 8-1.– Drive Belt Tension10.Remove blower housing Section ASSEMBLYPage NOTESBase & Pulley – Drawing No. 0E1323-A Section Exploded Views / Part NumbersITEM Section Exploded Views / Part NumbersPART NO. QTY DESCRIPTIONEnclosure – Drawing No. 0E1011-B Section Exploded Views / Part NumbersExploded Views / Part Numbers SectionITEM PART NOSheet Metal – Drawing No. 0E1012-E Section Exploded Views / Part NumbersITEM Section Exploded Views / Part NumbersControl Panel - Drawing No. 0E1013-A Section Exploded Views / Part Numbers0C2375 Section Exploded Views / Part Numbers760 V-TwinEngine – Drawing No. 0E1014-B Section Exploded Views / Part Numbers0C5730A Section Exploded Views / Part NumbersLP Regulator - Drawing No. 0E1530 Section Exploded Views / Part NumbersSection Exploded Views / Part Numbers0D5694 Section SPECIFICATIONS & CHARTS GENERATOR SPECIFICATIONS SPECIFICATIONS & CHARTSNOMINAL RESISTANCES OF GENERATOR WINDINGS AT 68F SectionLONG BLOCK TORQUE REQUIREMENTS ENGINE SPEEDS AND VOLTAGE SPECIFICATIONSTRIM TORQUE REQUIREMENTS RV TORQUE REQUIREMENTSPage NOTESSection ELECTRICAL DATA Page Section ELECTRICAL DATAPO BOX 297 WHITEWATER, WI P/N OE7225 REV OPRINTED IN THE USA/9.03