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Old 12-29-2015, 01:46 PM   #1
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Kohler CM21-RV Generator Thread

Those of us with the Kohler CM21-RV are learning to deal with its issues, and making improvements.
I believe the came in 7kw, and 5.5KW.
The engine used, I believe is called a K582QS, which is useful to know when looking for parts.

Lets consolidate all our issues and mods here!
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Old 12-29-2015, 01:48 PM   #2
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I believe some owners have added a plug to the generator so that it not only be removed for service, but also are using that plug to supply 50A service to run both AC units!

Can we get details on that too?
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Old 12-29-2015, 01:48 PM   #3
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I might be beneficial to post links to all the prior discussions as well.
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Old 12-29-2015, 01:56 PM   #4
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If you could post links to the manuals Brad?

I will post my Oil leak and drawer slide mods when I get a min!
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Old 12-29-2015, 02:10 PM   #5
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No need to provide links as they as small enough to directly upload to Airforums.

kohler-4cm21-rv-parts-catalog-tp5060.pdf

kohler-7cm21-rv-installation-manual-tp5005.pdf

kohler-7cm21-rv-parts-catalog-tp1184.pdf

kohler-7cm21-rv-service-manual.pdf

kohler228675instsheet.pdf

kohler-generator-owners-manual.pdf

kohler-regulator-information-tt747.pdf

Or if you want links to where I store the files here ya go:

Kohler 4cm21 rv parts catalog tp5060

Kohler 7cm21 rv parts catalog tp1184

Kohler 7cm21 rv service manual

Kohler generator owners manual

Kohler 7cm21 rv installation manual tp5005

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Old 12-29-2015, 02:18 PM   #6
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Quote:
Originally Posted by Keyair View Post
I believe some owners have added a plug to the generator so that it not only be removed for service, but also are using that plug to supply 50A service to run both AC units!

Can we get details on that too?
From the factory the generator is setup to run both air conditioners. You select the front air conditioner with the rotary switch in the kitchen and then start your generator. Once the generator is running you can start one or both air conditioners.

The Kohler 7CM21 generator has two circuits. One is dedicated to the rear AC and the other feeds the rest of the coach. There is a transfer switch in the back near the rear air conditioner (at least that's where it is on the 310) that once the generator starts it transfers the 2nd generator circuit directly to the rear air conditioner allowing it to run while the front air conditioner is powered from the 1st generator circuit.

It's optimal when running both air conditioners to leave one set on max temperature so it runs all the time and use the other air conditioner to modulate temperature in the coach. That way you don't have both air conditioners trying to start their condenser at the same time. The generator may not be able to handle the surge from both starting at the same time.

When I get a chance I'll upload all the sketches I made of the 1984 310 wiring which might help someone troubleshoot problems.


Brad
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Old 12-29-2015, 02:53 PM   #7
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Other than the Kohler specific issues and solutions, I would be interested to learn about the entry point for 50 amp conversations at the generator circuit. This would apply to all makes of Generators.
As discussed in other threads, the generator circuits green and white wire are bound together this side of the transfer switch mentioned by Brad.
At what point would you introduce the external 50 amp, after you disconnect the generator?
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Old 12-29-2015, 03:38 PM   #8
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Quote:
Originally Posted by PeterH-Airstreamer View Post
Other than the Kohler specific issues and solutions, I would be interested to learn about the entry point for 50 amp conversations at the generator circuit. This would apply to all makes of Generators.
As discussed in other threads, the generator circuits green and white wire are bound together this side of the transfer switch mentioned by Brad.
At what point would you introduce the external 50 amp, after you disconnect the generator?
Peter,

There are conversions to 50 amp, I did it on my Argosy but it's not necessarily done from the generator compartment. I'll look at the wiring sketches I have and see if I can determine the easiest way to do a 50 amp conversion. I think others on the forum have done the conversion (at least in trailers) so you might search for info.

I should have time to do some research in the next few days.

Brad
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Old 12-29-2015, 05:37 PM   #9
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Here is a link to my plan for curing the common Kohler oil leak.
http://www.airforums.com/forums/f448...eak-64381.html

Link to Brad's Drawer Slide Conversion.
http://www.airforums.com/forums/f159...ide-33447.html
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