The system is not complex at all, it is just like a conventional 2 wheel drive farm tractor with wheel brakes. It consists of a differential (spider gears and all) with no lockup device or traction control. It is an "open" differential. On each track, there is a brake. It is only capable of slowing down one drive sprocket or the other (or stopping it all together) In action it operates by forcing the track on the outside of a turn to proportionately increase its speed (differential action). The result is like trying to turn a farm tractor (while the wheels are straight ahead) with the brakes only. This puts greater load on the engine, because the brake is placing heavy drag on one driven axle. The normal crawler system has a clutch in each drive axle to disconnect the drive (either slipping that clutch, or complete disconnect) this allows full engine power (at the same ratio) to be applied to the outside track in the turn, and does not cause drag to be applied to the power flow. If further turning is needed, the coasting (declutched) track is then slowed further by braking action from the control lever as it goes from declutching an axle to braking that axle. A much better turn results, with no drag on the engine, and stronger continuous push or pull. Jim
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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