Onan Generator troubles
Hi all, I have an Onan microquiet 4000 generator. It seems to be going through brushes over the last few years. Only 1 brush wears out. I replace them and everything works fine for awhile. This las...
Forum Discussion
Your brush wear and FC32 seem to be telling you that the generator brushes or possibly brush block are having issues. Bulletin 682 talks about how to inspect and correct alignment. The control uses the input through the brushes to determine rotation speed at crank. Below is text from 682 bulletin.
HGJAx
Remove the cover and using a flashlight inspect the brush to slip ring contact thru the openings in the endbell. A sign of brush wear on the white insulation indicates possible misalignment. Check the field resistance between the brushes, F1 & F2. The resistance should be 31.97 ohms (+ -) 10%. If field resistance is out of spec and or poor brush alignment is evident, the generator must be disassembled to repair.
You didnt state hours for brush wear, but rapid and inconsistent brush wear is a sign something is out of whack between collector ring and brush.
HGJAx
Remove the cover and using a flashlight inspect the brush to slip ring contact thru the openings in the endbell. A sign of brush wear on the white insulation indicates possible misalignment. Check the field resistance between the brushes, F1 & F2. The resistance should be 31.97 ohms (+ -) 10%. If field resistance is out of spec and or poor brush alignment is evident, the generator must be disassembled to repair.
You didnt state hours for brush wear, but rapid and inconsistent brush wear is a sign something is out of whack between collector ring and brush.
