Driven disks are cushioned between the friction surfaces with the structure of the metal part being spring steel formed into a wave shape. When the driven disk is squeezed by the Pressure plate, the metal of the cushion spring flattens. This action allows the friction surfaces to make ever increasing force of contact as the pedal is released over a distance of about one to one and a half inches. As a driven disk wears, one thing that happens is that the Wavy cushion spring can flatten and also wear into the back of the friction material. The net result of this is a narrowing of the compressibility of the disk. The outcome is a substantial "thinning" of the stroke of engagement. The pedal feels like it is traveling only 1/4" between fully disengaged, and fully engaged. This abrupt feel to the clutch is somewhat annoying in that the action is often jerky and less predictable. If there is plenty of grab to it there is no issue of usefulness, just the feel, and sometimes chatter. If the tractor will kill the engine in less than one second if it is put in 5th, and is wide open, and the clutch is abruptly let out, the clutch is holding as well as needed. If the tractor does not kill the engine, it is getting worn, and will begin to slip radically in short order. Glazed disks, or gummy disks will also jerk into motion, but this is from stickieness not lack of cushion spring. Jim
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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