Output Voltage Troubleshooting Mobile Generator
wc_tx000726gb.fm 80
8.12 Checking the Main Rotor Winding
Prerequisites Generator shut down
Procedure Follow the procedure below to check the main rotor winding.
1. Remove the rear baffle from the machine.
2. Remove the cover from the generator.
3. Remove the screws that secure the bearing carrier to the stator.
4. Disconnect the blue and yellow wires from the AVR.
5. Using a puller, pull the bearing carrier/exciter stator from the stator housing.
6. Disconnect the wires to the main rotor winding. One is marked with a red tag and the
other is marked with a blue tag.
7. Measure the resistance across the two wires.
Is 1.4–3 Ohms measured?
8. Check each wire for short (path) to the rotor shaft.
Does each wire measure “OPEN” or “OL” to the rotor shaft?
The main rotor winding has now been checked. Continue with Checking the Exciter Rotor
Winding. Note: If moving on to the next test, leave the generator disassembled.
Yes____ No____ Your reading
Continue
The main rotor winding has failed.
Call Wacker Neuson Service.
Yes____ No____ Your reading
The main rotor
winding is OK.
The main rotor winding has failed.
Call Wacker Neuson Service.
wc_gr003811
1000
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200m
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