"Fordson Snowmobile 1926 This was known as an Armstead Snow-motor. Hauling capacity was said to be five tons. Each drum receives power from a separate clutch which, depending on the position of the steering gear, engages and disengages. It can also traverse bare ground. This machine hauled mail from Truckee to North Lake Tahoe." (Quote from website above)
I believe the video tractor was built by another mfg in 1920. It could be Ericson.
There is probably a pinion gear in the center of the rear housing. That would drive left and right hand gears opposite one another. The gears probably turned clutchable shafts than ran to the sprockets. You can see the lever that controled the clutches. It is connected to the steering wheel thru a drag link and pitman arm.
Nowadays it would be hydraulically driven. Apparently, the oil companies in Alaska have used these screw drives as they are very easy on the tundra in all seasons.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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