Output Voltage Troubleshooting Mobile Generator
wc_tx000726gb.fm 78
8.10 Checking the Rectifier Diodes—Thread-in Style
Prerequisites Generator shut down
Procedure Follow the procedures below to check the rectifier diodes.
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 diode’s lead from the terminal. Note the rubber washer isolating the lead
from the diode plate.
7. Using the diode scale on your multimeter, check each diode between the diode’s lead
and the diode plate. Reverse the probes of your meter and check the diode again. Each
diode should conduct in one direction and not in the other. Your meter should read 0.4–
0.5V in the direction that conducts.
Does each diode check OK?
8. Reconnect the AVR.
9. Reconnect the diodes. Be sure to include the washer when reconnecting the diode lead.
The rectifier diodes have now been checked. Continue with Checking the Main Rotor Win-
ding. Note: If moving on to the next test, leave the generator disassembled.
Yes No
The diodes are OK.
Replace all diodes.
Call Wacker Neuson Service.
wc_gr003811
wc_gr003815
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