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Red Devil

Swapping k series into an m series

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Red Devil

Curious has anyone swapped a 12 hp k series into a m series tractor? I have a 312-8 that needs a motor and I have a k series 12 motor and curious how big a deal the swap would be?

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midpack

I went the other way and put a Magnum 12 in where a KT17 was. the hardest part (Cpt. Obvious) is the wiring...  Luckily I had the whole machine to pick from, so i used the wiring harness and key switch from the Magnum machine and then used multiple wiring diagrams, voltmeter, light probe, and the harness light up panel (which i later ditched) to figure out where the safety switch connections went.

the guy I got the Magnum machine from couldn't get it running, I found out it was the low oil level sensor. I unplugged that wire ( pulled it out of the connector and taped it off) and it works great

 

IIRC, I do think that you'd need to change the key switch for the different electrical systems. but i could be wrong

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953 nut

Attached is a basic wiring diagram for the battery ignition system and the magneto system (safety switches not included) so you can see the differences. When the 300 series went from the "K" to the "M" they used relays so the safety systems would work. @gwest_ca posted some great information about the relays a few weeks ago.

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Battery system above, Magneto system below.

590319f851ddd_Mag.ignitiontractor-wiring.thumb.jpg.a58dd9040da6436967f963099473595e.jpg

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