"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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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