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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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