hokie21
My service guy was here today unexpectedly. He said there is a new PIB out for the 5875 due to brushes that were not properly installed at the factory. Apparently the brushes were wearing unevenly and not making good contact because of an assembly issue at Generac. He measured the resistance and it was 80 Ohms, where he said it should have been 10 Ohms. I got new brushes and a new computer circuit board with the latest software installed. Apparently they have to send back the old computer board with log history of undervoltage faults. I got to watch a pretty complete disassembly of the generator. Generac apparently paid ~ $500 for this service call. He showed me the brushes and you could see from the wear pattern that about 30 % of the brush surface area wasn't making contact.

John
Quote
genme
John, thanks for the information. I wonder if our 5875 (purchased 3/2011) is effected.

Our generator is not hooked up yet. If it can be determined that our generator is effected (by serial number, for instance), would it be better to not even start it up before getting this problem corrected?

Is is possible to get hold of the PIB's for this generator?
Model 5875, Nexus controller, 999cc Engine, 20kW LP, 2011
Quote
hokie21
My unit was installed in October of 2010. I saw multiple failed weekly tests due to "undervoltage" soon after the unit was installed. I don't think this issue should prevent your installation. I don't know if impacted units can be identified by serial number. It would be great to be able to see the service bulletins, but I don't know who folks who are not dealers get them.

Before the service guy replaced the brush assembly, he checked the brush resistance by connecting his ohm meter to pins 0 and 4 of the disconnected plug to the voltage regulator. He made several resistance readings, using the generator start button to cause a little rotation of the brush/slip ring position between each reading.
Quote
GEI3137
post your serial numbers and a dealer on this forum would let you know if your unit is on the list
Quote
d11gnccer
Do you have the bulletin number? I couldn't find it under GENService unless I overlooked it.
Quote
genme
Thanks everyone. The number is xxxxxxx, model 0058750. I'd be interested in learning about any recalls out there (if any.) At this time, I don't know the mfg date. The controller part number is 0H6680B.
Model 5875, Nexus controller, 999cc Engine, 20kW LP, 2011
Quote
hoghead
I have seen the SIB on the controller. I have not seen one for the brushes.
Quote
Enginerd
Hi - I installed a 10kW NG unit in Nov 2010 serial 006110XXX. Recently went to run it manually and it shut down due to undervoltage. Started again and ran without incident, but when I measured the voltage at the hot leads I get 115V and 130V, 250V between them with no load on the system. I don't know enough to know if this is within spec or not, but have been searching the threads on this topic, and wonder if I need to look into this? Any advice appreciated, thanks.
Quote