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 - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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