Wacker Neuson GP 3800A, Repair Manual

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GP Repair Table of Contents
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6. Troubleshooting 72
6.1 Troubleshooting Methodology ............................................................ 72
6.2 Checking Continuity ........................................................................... 74
6.3 Checking Resistance .......................................................................... 74
6.4 Checking Voltage ............................................................................... 74
6.5 Troubleshooting Flowcharts ............................................................... 75
6.6 No Voltage at Receptacles—Flowchart 1A ........................................ 76
6.7 No Voltage at Receptacles—Flowchart 1B ........................................ 77
6.8 Checking Voltage at Generator Terminal Strip ................................... 78
6.9 Checking Voltage at Plug—GP 2500A ............................................... 79
6.10 Checking Main and Rotor Windings ................................................... 80
6.11 No Voltage at Receptacles—Flowchart 1C ........................................ 82
6.12 Checking Main Circuit Breaker and Receptacle Circuitry ................... 84
6.13 Low Voltage at Receptacles—Flowchart 2A ...................................... 86
6.14 Checking Brushes .............................................................................. 87
6.15 Checking Excitation Winding .............................................................. 88
6.16 Checking AVR’s Sensing Wires—GP 2500A ..................................... 90
6.17 Checking AVR’s Sensing Wires ......................................................... 92
6.18 Confirming a Malfunctioning AVR ...................................................... 94
6.19 Checking and Installing the Voltage Selector Switch (VSS) ............... 96
6.20 High Voltage Troubleshooting—Flowchart 3A ................................... 98
6.21 Auto Idle Circuit Troubleshooting—Flowchart 4A ............................... 99
6.22 Checking Voltage to Auto Idle Solenoid ........................................... 100
6.23 Checking Auto Idle Circuitry Between Generator and Fuse ............. 102
6.24 Checking Auto Idle Circuitry Between Fuse and Auto Idle Unit ....... 104
6.25 Engine Backfires—Troubleshooting Flowchart 5A ........................... 105
6.26 Checking Anit-Afterfire Solenoid (AAS) Circuit ................................. 106
7. Disassembly/Assembly Procedures 109
7.1 Tools ................................................................................................. 109
7.2 Ordering Parts .................................................................................. 109
7.3 Reference Numbers ( ) ..................................................................... 109
7.4 Weight Block .................................................................................... 109
7.5 Replacing the Muffler ....................................................................... 110
7.6 Replacing the Fuel Tank .................................................................. 112
7.7 Replacing the Stator ......................................................................... 114
7.8 Replacing the Rotor .......................................................................... 116
7.9 Replacing the Engine ....................................................................... 118