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 - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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