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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

Onan 15JC


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  #1  
Old 11-04-2017, 06:38:52 PM
EnginePat EnginePat is offline
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Default Onan 15JC

I looked at this generator today, it's a 15jc 3phase.
Can it be rewired to run 120/220? Or is it strictly 3 phase? It starts and runs great!

Model# 15jc-4r/6622r
Serial# 127c997450
Exciter#06sx193b magniciter?
120/208 3 phase
Gen data 15JC/179
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  #2  
Old 11-04-2017, 07:22:18 PM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan 15jc

It is 3 phase only.Probably could change it if you have time and money.
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Old 11-04-2017, 08:01:09 PM
EnginePat EnginePat is offline
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Default Re: Onan 15jc

I was afraid of that , it's a good runner. I sold the 12k djc head I had from my blown djc. I could pick it up for $300.
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Old 11-05-2017, 10:55:33 AM
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Default Re: Onan 15jc

The owner texted me this morning, he does not want it and will trade a smaller 2k-3k generator for his camper. I just picked up the AJ 2.5 120-240 volt generator, he looked at it at said this thing is sweet! Should I trade?
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Old 11-05-2017, 11:43:08 AM
Max Thompson Max Thompson is offline
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Default Re: Onan 15jc

Yes!

I will give you what you paid for the AJ in exchange for "just a few" parts from the JC.
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Old 11-05-2017, 12:01:53 PM
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Default Re: Onan 15jc

MAX, do you have any magniciter machines?
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Old 11-05-2017, 02:41:51 PM
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Default Re: Onan 15jc

[QUOTE=Max Thompson;1433468]Yes!

"just a few"


Yep I bet!
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Old 11-05-2017, 03:02:49 PM
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Default Re: Onan 15jc

Which building are they in Max
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Old 11-05-2017, 03:57:17 PM
Max Thompson Max Thompson is offline
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Default Re: Onan 15jc

Quote:
Originally Posted by nothingbutdarts View Post
MAX, do you have any magniciter machines?
1 JC, no JBs. I am about ready to scrap a 5D gen-end off a mag set, I gave the mag unit to another Staker and have no use for the rotor & stator. I do have a "few" other green sets.

The one I have was one of my earlier acquisitions and is mounted on an Onan trailer with full enclosure, and a 50 gal gasoline tank under the set.
https://www.smokstak.com/forum/album.php?albumid=844 This was my first restoration of a JC, I like to think my abilities have come a little way since then.
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Old 11-05-2017, 04:09:05 PM
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Default Re: Onan 15jc

I don't know MAX, sure looks like a VERY NICE JOB on the linked JC that I see!!!
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Old 11-05-2017, 04:44:14 PM
Max Thompson Max Thompson is offline
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Default Re: Onan 15jc

It is one of those 30 mph paint jobs, standing close up, not so good. I need to pull it in this winter and re-torque the heads or replace the gaskets, leaking a little oil around them.

Not one of my favorite sets, 3-phase only so only 10 KW from the 2 120-V legs and the other leg is 208 (or some odd voltage).

It was one of a pair I bought, the other was a parts machine but the trailer was worth the trip and what I paid for the 2. Also wound up with several spare parts.

It did get quite a bit of use a few years back before they got power run to the club house at a shooting range. Many weekends it ran for 10-12 hrs. a day, though never loaded too heavy.
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Old 11-06-2017, 09:07:57 AM
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Default Re: Onan 15jc

On this onan there is a switch on the lower left corner of the panel that is broken, could that have been a voltage selector switch? I don't have a pic yet but will try today.
I was looking at the jc on a trailer in the CL for sale section and noticed the switch on that one located in that area. The pic attached is the one for sale not 5he one I am looking at.
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Old 11-06-2017, 09:26:48 AM
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Default Re: Onan 15JC

If that switch is still wired up. Do not turn it while running. You will get to see smoke and flame.
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Old 11-06-2017, 09:58:48 AM
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Default Re: Onan 15JC

Quote:
Originally Posted by Billy J Shafer View Post
If that switch is still wired up. Do not turn it while running. You will get to see smoke and flame.
LOL! I'm sure I will not do that! Thanks billy!!
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Old 11-06-2017, 09:20:40 PM
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Default Re: Onan 15JC

I would like to get the wiring schematic for this machine if anyone has one. Thanks
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Old 11-07-2017, 08:04:09 AM
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Default Re: Onan 15JC

Spec. U is as close as I could find. These should get you close.
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File Type: pdf 15 JC 4R 6622U.pdf (22.9 KB, 9 views)
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Old 11-07-2017, 07:18:29 PM
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Default Re: Onan 15JC

Did the trade today, 2.5 AJ for the 15k JC he's happy and so am i.

Couple pics , one of the switch that needs to be replaced, its not what I thought it was. But what the heck..
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Old 11-07-2017, 07:51:55 PM
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Default Re: Onan 15JC

Or could add 2 more volt meters to monitor all phases at once.

But long as windings don't short can just monitor voltage on 1 phase and watch the 3 amp meters instead.
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Old 11-07-2017, 08:03:08 PM
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Default Re: Onan 15jc

Quote:
Originally Posted by Billy J Shafer View Post
It is 3 phase only.Probably could change it if you have time and money.
Can be done.
easier of you have the Onan winding data, but he EASA tables and formula most shops use will give you a reasonable winding.

It will cost what a rewind costs in your area.
Find a shop with a armature balancing machine before you ask if they can do it.
This is not common anymore.
Armature work is going the way of the do-do.

Find a local shop that does generator repair but not rewinding ask them who they prefer.... ( bring doughnuts and coffee for the guys in thanks for answering questions )
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Old 11-07-2017, 08:11:41 PM
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Default Re: Onan 15JC

Once I fix the switch, and find gauge clear fronts for the gauges and clean it up I'll decide what to do with it. It's a good runner and propane.

I have read that somtimes onan used 6 or 12 wire heads instead of 4 wire heads and buried the extra wires. Should I look in the gen head for them?
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Last edited by EnginePat; 11-07-2017 at 09:17:02 PM.
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