sean

Called in to service generator, had not been touched for 2 + yrs. working / running just fine, oil change , etc. when testing voltages,200 and 120-N. Both legs under load.  Ohms on wire 4-0 is 315 ohms, my guess is dirty slip rings ? Do you all agree before I tear down ? Model is 005050 Ser 5646734  17 kw generac

thank you
On the rock

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78buckshot
If in fact you were measuring the resistance of the rings/brushes/rotor without any other component connected then yes, slip rings and/or brushes need attention. I'm a little confused on the voltage reading though, are you saying you had 200 VAC on one leg to neutral and 120 VAC on the other leg to neutral? After re-reading I see the title, I think that machine has a separate voltage regulator that has an adjustment pot, try turning it clockwise while the machine is running with your meter on the output.
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sean
Ha, that was confusing, 200 volt phase to phase , 100 volt phase to neutral both phases.
Yes, it does have a voltage regulator with voltage adjust screw but I was a bit concerned to adjust until I find cause of voltage change. i will access slip rings and brush in the morning, polish rings, clean and inspect brushes , test and then run. Adjust regulator! Is this adjustment made periodically ? I have not needed to do this other than new imstallation.
thank you 
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78buckshot
The regulators tend to "creep" as they age, most that I see go higher with time. I would certainly clean the slip rings and after you get it back together adjust the VR. With the age of it don't be surprised to find a very touchy pot, might have to replace the regulator if it won't stay.
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sean
Can I get the part number for the AVR for this 17 kw please
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78buckshot
You can call Ziller with your serial # and they can probably ship it out the same day.
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