24 hours into Sandy power outage my 6 yr old 30KW generator with 290 hours (only been in home for 1yr) that worked flawlessly for 5 days a year earlier stopped working and had an under voltage code. I had two techs come out and both thought it was low oil - like I'm too stupid to check oil. The second guy at least did a little more work and replaced badly corroded plugs and oil. He thought it was likely that it had never been serviced. He got it working and told me to exercise it weekly for the next two months and then he'll change the oil again and hopefully I'm good to go. After 9 weeks he couldn't come out, so he suggested I go at it myself. Per his instructions, I fired it up this morning for 30 min to get it warm, drained the oil and filter, reattached filter and put 2qt Mobil 1 and fired it up again for 2 min to get the rest of the sludgie oil out, changed filter and added fresh oil and the darn thing won't start - throwing the dreaded UV code again. HELP PLEASE - why did it exercise flawlessly for 2 months, but with new oil and filter it's not running right again?
The UV code has nothing to dow ith oil, poor oil would cause under frequency (low engine speed) Under voltage is caused by excessive load, short in the rotor/stator excition system, and/or AVR automatic voltage regulator. Of course loose wiring to will also cause it.
SOURCE: my 3.5 kw kohler marine
Check that when you run it, it is not in fact making correct voltage (within about 10% is good), also make sure the engine is coming up to full speed, 3600 or 1800. You could check this with a multimeter that measure hertz. On the main output leads when the genset is running make sure it is getting close to 60 hz. or if you are in an area that uses 50 hz. check for that respectively. There are a couple things that would affect this, one would be your SCR module. There is a test procedure for this which you could find here. http://www.scribd.com/doc/50171916/tp6196-1 . I don't work on marine units, mostly standby so these manuals are for residential. Check your fuses, could even go as far as checking the wiring in the back and wiring and condition of the brushes and sliprings. These actually build field voltage to make 240 or 120 volts whatever your unit is configured to make. The brushes need to sit flat on the slip rings and on a unit with 10 hrs. the sliprings I can't imagine would be very dirty but check that as well. If you have an ADC2100 controller use this manual to go into the controller to verify that it is set for the correct voltage that the machine is built to make. The only other fairly simple thing to check that I've had issues with is if Kohler mounted a fuse block on the side of the cabinet mounted to the genset with no vibration isolation. Check these fuses while attempting to run the unit and make sure you getting steady voltage out of them as sometimes they will vibrate causing pulsed voltage to come out of them and can give you an intermittent UU, UF, or OC fault (undervoltage, underfrequency, overcrank).
SOURCE: My 23 hp kohler courage
it sounds like the jet is dirty in the carburetor. Remove the float bowl and in the center there should be a jet that you can remove and clean. There are small holes on the side of it which you can clean with a thin piece of wire. Clean the center hole also.
SOURCE: My Kohler 11RMY (40 amp) standby generator will not start
If the engine does not turn over check for the obvious , dead battery or blown fuse or fuses on the control board.
SOURCE: I have a new Kohler 12kw res generator on propane - backfiring
did you put the propane orifis in and unplug the spark wire
SOURCE: I have Kohler 12Res generator,sometimes
If it has a couple hundred hours or more, try cleaning the slips rings on the back of the rotor shaft. They should be very shiny and not black or polished looking.
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