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[Bob Bender]

Onan gen starts and then shuts down. If you hold start button it runs for about a minute. Its a model 4kyfa26100k 4000 wattmicroquiet 4000.

[Steve Calabro]

Check the oil. Probably low oil shutdown switch.

[Bob Bender]

Steve its full

[Dan Fletcher]

Put out an SOS for SG racer Matt Sherman. Great guy, generator guru, and part time stand up comedian. I'm sure someone here has his number.

[Bill Baer]

Bob
The service manual is available on line @ http://www.cumminsonan.com/www/pdf/m.../981-0530C.pdf
The parts manual is available @ http://www.trekdocs.com/Onan%204000%...%20first43.pdf
I have had this problem twice with my onan. KY . first time it was the control assembly this time it's a short in the rotor.
If you not a DIY type and want some one else to repair it or need parts perhaps you could contact Rich Biebel on this form.
Rich informed me that these little generators are tough on brushes too and the motor will not run if the generator is not producing 120 volts.
Be forewarned that onan parts are not cheap $$$$$.
If you want to trouble shoot it yourself download the manual and start reading.
To get the rotor out you'll need to turn a 1/2" X 7-7/8 long rod stock down to .450 dia. But you can chech it with an ohm meter first . section10 of the manual will help you in trouble shooting it as well.
Hope this helps.

[Rich Biebel]

Dan and Bill are correct...

Matt is a comedian but also a pretty dern good S/G racer...LOL..... and we have worked together for over 20 years for RJ Control Inc...

Bill is also correct.....brushes are the first thing to check on a 4KY
It is not hard for me but I do them all the time.

An ohmmeter across 2 pins that connect the brushes to the controls is the first test to do. A good reading should be around 20-25 ohms and it should not change when you slowly turn it by hand at the blower wheel..

The brushes are under the blower wheel and take a lot of work to get to.

Just did one yesterday for a racer and his unit is good to go again and coming back out to Maple Grove tomorrow night..

4KY's don't have an oil pump so they have no low oil pressure switch.
They rely on splash oil.
The older ones do have an oil level switch and they sometimes cause shut downs but usually only after the unit runs for a long time.
They did away with that switch......If you run low on oil your engine will break a rod......aluminum rod, no bearing...

Cummins owns Onan.....Onan was never shy about their parts prices and prices have risen considerably since Cummins took over.

Matt and I both will be at the Dutch....
Truthfully.....I hate working on generators at the track when I am trying to race......I hide....LOL
Matt likes it and was all over the place last weekend diagnosing issues for everyone from NHRA on down the line.
Making major repairs at the track is usually pretty difficult....

[Bob Bender]

Input a new pump on 2 yes I got from Matt at Cecil. I put in a new batt. It went dead. Changed the fuel filter. Now its not pulling fuel through the filter. Ran great last night.

[Bob Bender]

32 code

[NHRA3106]

Had this very issue with the same generator on my motorhome several years back. I called the Onan/Cummins service center in Louisville, KY, and the tech was able to tell me exactly what it was, and mailed me the part. It ended up being a small electrical board that cost me roughly 100.00, and simply screwed back in, and plugged in...issue fixed. Here is there number, and I know there are several other locations, 502 491-4263...hope this helps!