Guardian 4700 - PROBLEM 4 - EXCESSIVE VOLTAGE;FREQUENCY DROOP WHEN LOAD IS APPLIED; PROBLEM 5 - PRIMING FUNCTION DOES NOT WORK

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Section 6

TROUBLESHOOTING FLOWCHARTS

Page 24

Table of Contents

Default Chapter3
- Table of Contents3
Section 15
Safety5
Generator Fundamentals5
- Magnetism5
- Electromagnetic Fields5
- Electromagnetic Induction5
- A Simple Ac Generator6
- A more Sophisticated Ac Generator6
- Test7
- Field Boost8
- Generator Ac Connection System8
- Generator Fundamentals8
Section 29
Major Generator Components9
- Rotor Assembly9
- Stator Assembly9
- Brush Holder9
- Battery Charge Components10
- Excitation Circuit Components10
- Breather Assembly11
Section 312
Insulation Resistance Tests12
- Effects of Dirt and Moisture12
- Insulation Resistance Testers12
- Drying the Generator12
- Cleaning the Generator12
- Stator Insulation Resistance13
- Testing Rotor Insulation14
- The Megohmmeter14
- Insulation Resistance Tests14
Section 415
Measuring Electricity15
- Meters15
- The vom15
- Measuring Ac Voltage15
- Measuring DC Voltage15
- Measuring Ac Frequency16
- Measuring Current16
- Measuring Resistance16
- Electrical Units17
- Ohm's Law17
Section 518
Engine DC Control System18
- Introduction18
- Operational Analysis18
- Engine Controller Circuit Board18
- Battery20
- 7.5 Amp Fuse21
- Fuel Primer Switch21
- Start-Stop Switch21
- Starter Contactor & Motor22
Troubleshooting Flowcharts23
- If Problem Involves Ac Output23
- Voltage & Frequency Are both High or Low23
- Residual Voltage (5-12 Vac)24
- No Battery Charge Output25
- Excessive Voltage/Frequency Droop When Load Is Applied26
- Priming Function Does Not Work26
- Engine will Not Crank27
- Engine Cranks but will Not Start28
- Engine Starts Hard and Runs Rough29
- Engine Starts then Shuts down30
- Problem 10 - 7.5 Amp (F1) Fuse Blowing31
- Troubleshooting Flowcharts31
Section 732
Diagnostic Tests32
- Check No-Load Voltage and Frequency32
- Check Engine Governor32
- Test Excitation Circuit Breaker33
- Fixed Excitation Test/Rotor Amp Draw33
- Wire Continuity34
- Check Field Boost34
- Test Stator DPE Winding35
- Check Sensing Leads/Power Windings36
- Check Brush Leads37
- Check Brushes & Slip Rings37
- Check Rotor Assembly37
- Check Main Circuit Breakers38
- Check Load Voltage & Frequency38
- Check Load Watts & Amperage38
- Check Battery Charge Output39
- Check Battery Charge Rectifier39
- Battery Charge Resistor39
- Try Cranking the Engine40
- Test Primer Switch40
- Check Fuel Pump41
- Check 7.5 Amp Fuse42
- Check Battery & Cables42
- Check Power Supply to Circuit Board42
- Check Start-Stop Switch43
- Check Power Supply to Wire 5644
- Check Starter Contactor44
- Check Starter Motor45
- Check Fuel Supply45
- Check Wire 14 Power Supply46
- TEST 30 - Check Wire 1846
- Check Fuel Solenoid46
- Check Ignition Spark47
- Check Spark Plug48
- Check Ignition Coil48
- Check Valve Adjustment49
  - Check Carburetion50
  - Check Choke Solenoid50
  - Check Engine / Cylinder Leak down Test / Compression Test52
  - Check Oil Pressure Switch52
  - Check Oil Temperature Switch53
  - Test Choke Heater54
  - Diagnostic Tests54
Section 855
Assembly55
- Major Disassembly55
Section 956
Exploded Views / Part Numbers56
- Enclosure Drawing56
- Generator Drawing58
- Control Panel Drawing60
- H/Sh Engine Drawing62
- Major Features and Dimensions66
Section 1067
Specifications & Charts67
- Generator Specifications67
- Nominal Resistances of Generator Windings at 68°F67
- Engine Speeds and Voltage Specifications67
- Torque Specifications68
Section 1170
Electrical Data70
- Electrical Schematic and Wiring Diagram70

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