Thieman Model A Tractor

[Gary WA]

Went to the yearly Largest west coast Steam and Tractor show Lynden WA.

 

[rotorwrench]

That one has a very interesting rear axle set up. I wonder if it has gear or chain drive. The Fordson model F and N had competition. The steering reminds me of the IHC Farmall model F20.

 

[nkaminar]

It looks like the differential was turned over and gear drive used. When I was 14, I made the mistake of reinstalling the differential in my 27 Chevy up side down. 3 gears in reverse and one gear forward. I caught it before doing any driving with the pickup.

 

[BRENT in 10-uh-C]

that one has a very interesting rear axle set up. i wonder if it has gear or chain drive. The fordson model f and n had competition. The steering reminds me of the ihc farmall model f40.

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[Hitman]

Reduction boxes. Some vehicles are still produced with reduction box rear axles.

 

[David in San Antonio]

Do the reduction boxes use gears or a chain? If gears, the driven gear is immense!

 

[mcgarrett]

Many of them used gigantic ring gears mounted on the oversized rear wheels with the rear axle driving them by the use of spur gears on the axle shafts. Staude Mak a tractor was one of this type installed on Model T's.

https://i.pinimg.com/originals/d5/51/f3/d551f33c49df7b96ed7a33c25e99156d.jpg

 

[nkaminar]

From the photos that Brent posted, it looks like chain drive.

 

[Mike Peters]

This is an early Thieman in the Wheels 'O Time museum in Dunlap, Illinois. Open final drive chain. Looks to me that Thieman made a special final drive sprocket that bolted to the rear brake drum and was held on by the rear axle nut, along with the brake drum itself. The later Thiemans were upgraded to an enclosed final drive, as shown in the photos above.

 

[rotorwrench]

I speak from experience that plowing and tilling with a tractor is a dirty business and especially if the tool bar is under the tractor. The enclosed chain case will vastly increase the life of the chain and sprockets. The Mack Bulldog trucks used chain drive back in the day and a fair amount of the old horseless carriages did also. They are reliable and chain was cheap back then.

It looks like the brake was a single hand operated set up. No turn brakes and not much of a good place to put your feet.