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i believe the "window" is for use in snow so the snow can push on through the track pad. i saw a rock drill the other day with tracks from a oc3 on it also. if the tracks have the same pitch and are the same width inside and out,and have bushing the same dia., why wouldn't they work?

regarding the magneto issue about turning over too fast.......that is what the inpulse coupling does in a magneto, it makes it snap fast to produce a hot spark. if mag is turning fast enough to override impulse coupler than it is turning fast enough to make a hot spark. the issue regarding a 6 volt starter being spun on 12 shortening it's life....i am no expert but it seems like i heard that when you double the votage the amperage is cut in half , sooo, if a 6 volt starter is designed to handle the increased amperage of the low voltage 6 volt system, running it on twice (12)the volts would be twice as easy on the starter. military vehicles use 24 volts to reduce the amperage even more wich results in less starting problems due to bad or corroded connections etc. I don't think the starter spins fast enough to hurt it's self on 12 volts. we had a conversion on a wc allis that has had the same 6 v starter in it for 20 years and is still going strong.

i think i saw that of wich you speak in a bone yard about 20 mi. from me. next time i am near i will stop in and see if there is anything left of it.

I owned a white halftrack as well and it was my understanding that b.f. goodrich developed and manufactured the endless rubber track. i had an n.o.s. spare track that was clearly marked as such and the tracks that were on the vehicle were marked that way as well. i can't say who developed the boggie system on the suspension but i thought the engineers at white truck  did.

i stand corrected. i only own 1 cletrac and a handfull of cats and i did not realize oliver even made a steering clutch type tractor, but that oc-96 is the hot set-up.

clark built a lot of controlled diffs. for many manufactures like the cletrac crawlers. they also put them in early case and i think the terra-trac crawlers and some military track layers also. they were also used in some snow cat type tractors. They also built regular diffs that were used in the cletrac general and b.f. avery , minnie mo b.f. ,and other tractors to name a few. I have a bombardier j-5 tracked machine with a 5' bushhog mounted on rear that uses a clark controlled diff. or a copy of such. i even found an old advertisement from clark showing all the different types of differentials that they offered for tractor and equipment builders to consider. I hope this helps somewhat.

i believe the term spot turn refers to the machines ability to turn on the spot, meaning it will turn just like a skid steer loader. my only encounter of this type a machine is a oc-96 owned by a fellow employee. the rear end uses clutch packs operated by hyd. pressure to engage clutches and planetary gears to get reverse etc. you could steer it like a conventional cat by pressing down on brake pedal wich energized a dump vale to drop clutch pack pressure and release power to track. if you pressed further down it engaged a master cyl. wich applied brakes on the rear mounted brake drum attached to the shaft on the clutch packs.  in my opinion it was years ahead of it's time.

i have a jacobsen g-10 that i would maybe like to have a spare trans if you do not use or need this one.