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_gr
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38
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wc_gr003815
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Summary of Contents for G 85
Page 1: ...Repair Manual Mobile Generator G 85 0171726en 004 0809 0 1 7 1 7 2 6 E N ...
Page 8: ...Table of Contents MG Repair wc_br0171726en_004TOC fm 8 ...
Page 17: ...Mobile Generator Theory of Operation wc_tx001077gb fm 17 wc_gr003303 c a a d e f b c b d e ...
Page 58: ...ECM Sensor Troubleshooting Mobile Generator wc_tx000723gb fm 58 Notes ...
Page 85: ...Mobile Generator Disassembly Assembly wc_tx000575gb fm 85 c h b d d e f g a wc_gr003320 a ...
Page 87: ...Mobile Generator Disassembly Assembly wc_tx000575gb fm 87 wc_gr003321 a f e j i h b c d g ...
Page 95: ...Mobile Generator Disassembly Assembly wc_tx000575gb fm 95 Notes ...
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