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Rich Biebel · 10-07-2014, 12:29 PM

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....

10-07-2014, 12:29 PM	#7
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,320 Likes: 25 Liked 557 Times in 217 Posts	Re: Help 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.... __________________ Rich Biebel S/C 1479 Stock 147R Last edited by Rich Biebel; 10-07-2014 at 12:32 PM.