Generac Power Systems 75 User Manuals

Table of Contents

• TROUBLESHOOTING FLOWCHARTS

  27
• IF PROBLEM INVOLVES AC OUTPUT

  27
• GENERATOR FUNDAMENTALS

  3
• MAGNETISM

  3
• ELECTROMAGNETIC FIELDS

  3
• HIGH OR LOW

  27
• ELECTROMAGNETIC INDUCTION

  3
• A SIMPLE AC GENERATOR

  4
• A MORE SOPHISTICATED AC GENERATOR

  4
• RESIDUAL VOLTAGE (5-12 VAC)

  28
• FIELD BOOST

  6
• GENERATOR AC CONNECTION SYSTEM

  6
• NO BATTERY CHARGE OUTPUT

  29
• MAJOR GENERATOR COMPONENTS

  8
• WHEN LOAD IS APPLIED

  30
• ROTOR ASSEMBLY

  8
• STATOR ASSEMBLY

  8
• BRUSH HOLDER

  9
• (GASOLINE MODELS)

  30
• BATTERY CHARGE COMPONENTS

  9
• EXCITATION CIRCUIT COMPONENTS

  9
• ENGINE WILL NOT CRANK

  31
• CRANKCASE BREATHER

  10
• (GASOLINE UNITS)

  32
• INSULATION RESISTANCE TESTS

  12
• EFFECTS OF DIRT AND MOISTURE

  12
• INSULATION RESISTANCE TESTERS

  12
• (LP UNITS)

  33
• DRYING THE GENERATOR

  12
• CLEANING THE GENERATOR

  12
• STATOR INSULATION RESISTANCE

  13
• (GASOLINE UNITS)

  34
• TESTING ROTOR INSULATION

  14
• THE MEGOHMMETER

  14
• (LP UNITS)

  34
• MEASURING ELECTRICITY

  15
• ENGINE STARTS THEN SHUTS DOWN

  36
• METERS

  15
• THE VOM

  15
• 7.5 AMP (F1) FUSE BLOWING

  37
• MEASURING AC VOLTAGE

  15
• MEASURING DC VOLTAGE

  15
• MEASURING AC FREQUENCY

  16
• INTRODUCTION

  38
• MEASURING CURRENT

  16
• MEASURING RESISTANCE

  16
• Check No-Load Voltage And Frequency

  38
• ELECTRICAL UNITS

  17
• OHM’S LAW

  17
• Check Engine Governor

  38
• ENGINE DC CONTROL SYSTEM

  18
• Test Excitation Circuit Breaker

  39
• INTRODUCTION

  18
• Fixed Excitation Test/Rotor Amp Draw

  39
• OPERATIONAL ANALYSIS

  18
• ENGINE CONTROLLER CIRCUIT BOARD

  24
• Wire Continuity

  40
• BATTERY

  24
• 7.5 AMP FUSE

  25
• Check Field Boost

  41
• FUEL PRIMER SWITCH

  25
• Test Stator DPE Winding

  41
• START-STOP SWITCH

  25
• Check Sensing Leads/Power Windings

  42
• & STARTER MOTOR

  26
• Check Brush Leads

  43
• Check Valve Adjustment

  61
• Check Brushes & Slip Rings

  43
• Check Carburetion

  62
• Check Rotor Assembly

  44
• Check Choke Solenoid

  62
• Check Main Circuit Breaker

  44
• Compression Test

  64
• Check Load Voltage & Frequency

  45
• Check Oil Pressure Switch

  65
• Check Load Watts & Amperage

  45
• Test Oil Temperature Switch

  65
• Check Battery Charge Output

  45
• Test Choke Heater

  66
• Check Battery Charge Rectifier

  45
• Check LPG Fuel Solenoid

  66
• Battery Charge Resistor

  46
• ASSEMBLY

  68
• Try Cranking the Engine

  47
• MAJOR DISASSEMBLY

  68
• Enclosure/Panel Removal

  68
• Test Primer Switch

  47
• Stator Removal

  68
• Check Fuel Pump

  48
• Rotor Removal

  68
• Belt Tensioning

  69
• Check 7.5 Amp Fuse

  49
• Engine Removal

  69
• Check Battery & Cables

  49
• Startor Removal

  69
• Flywheel/Magneto Removal

  70
• Check Power Supply to Circuit Board

  49
• Check Start-Stop Switch

  50
• BASE & PULLEY DRAWING

  72
• Check Power Supply to Wire 56

  51
• ENCLOSURE DRAWING

  74
• SHEET METAL DRAWING

  76
• Check Starter Contactor Relay

  51
• CONTROL PANEL DRAWING

  78
• Check Starter Contactor

  52
• 760 V-TWIN ENGINE DRAWING

  80
• LP REGULATOR DRAWING

  82
• Check Starter Motor

  52
• SPECIFICATIONS & CHARTS

  84
• Check Fuel Supply

  54
• MAJOR FEATURES AND DIMENSIONS

  84
• Check Wire 14 Power Supply

  56
• GENERATOR SPECIFICATIONS

  85
• Check Wire 18

  56
• GENERATOR WINDINGS AT 68°F

  85
• VOLTAGE SPECIFICATIONS

  86
• (Gasoline Models)

  57
• TORQUE SPECIFICATIONS

  86
• Check Ignition Spark

  57
• ELECTRICAL DATA

  88
• Check Spark Plugs

  59
• WIRING DIAGRAM

  88
• Check and Adjust Ignition Magnetos

  59