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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

Tell me about this Onan?


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  #1  
Old 04-30-2018, 06:12:28 PM
Handyhiker1 Handyhiker1 is offline
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Default Tell me about this Onan?

Looking at this but know nothing about it. It is water cooled.
The numbers are 15hc 5r8/944a 18b581363, model & serial nunber
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  #2  
Old 04-30-2018, 06:43:29 PM
Kevin K Kevin K is offline
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Default Re: Tell me about this Onan?

Is it free? I hate to say it, but... some things are better left alone. It is 240v 3 phase 3 wire, and revolving armature so that can't be changed.

Download the manuals:

938-0001 owners manual
938-0002 parts
Attached Files
File Type: pdf 15HC5R8944A.pdf (28.9 KB, 23 views)
File Type: pdf 612-0626.pdf (92.1 KB, 18 views)
File Type: pdf 612-0631.pdf (94.5 KB, 12 views)
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Old 04-30-2018, 06:57:09 PM
len k len k is offline
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Default Re: Tell me about this Onan?

Looks like a flat head.
Flat heads are thirsty for gasoline
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Old 05-01-2018, 03:47:57 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Tell me about this Onan?

Thanks for the info. It is not free but is what I thought a good price. I did not know what the output was as far as voltage and phase. I will just let it go at this point.
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Old 05-01-2018, 11:41:25 AM
Vanman Vanman is offline
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Default Re: Tell me about this Onan?

It is straight forward to convert a 240 volt, 3 phase, 3 wire generator into a 120/240 volt, 3 phase, 4 wire generator with a relatively small autotransformer. This could be reasonably inexpensive, so long as the transformer is purchased second hand.

You'll have 120/240 volt, single phase, as well as 240 volt, three phase, but the usual single phase derating applies. It's a great solution for one who needs both, or if one has two additional 240 volt, single phase loads...

It's ideally suited to a really "cool" set that you really like, but doesn't have your desired voltage output.

Last edited by Vanman; 05-01-2018 at 03:09:28 PM.
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Old 05-01-2018, 12:01:39 PM
len k len k is offline
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Default Re: Tell me about this Onan?

Between thirsty , buying a transformer, and 2/3 output on single phase I'ld pass based on $$.
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Old 05-01-2018, 03:14:49 PM
Vanman Vanman is offline
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Default Re: Tell me about this Onan?

Maybe. Depends on how rare it is. I would happily put a 230 volt, 3 phase, 3 wire Kohler to use if it was one of the nice Waukesha powered 1200 rpm sets. Indeed I tried really hard to get one several years ago. But I was willing to spend $500 and the seller wouldn't go below $800. Admittedly, if it had been single phase, OR automatic (it was hand crank only, but I would have made it remote start at least), I would have stepped up.
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