Hi, my brother has a 684 and the Lucas alternator quit on it several years and I was able to fix it by repair the ground that contacts the opposite end of the drive shaft from the drive pulley. I just cannot recall exactly what the repair was but it did involve either brazing the end of the shaft or the strip of metal that contacted the shaft. This metal strip provided the ground for the rotor and without the ground the alternator would not charge.
A few years later the Lucas died again and my brother went to local auto scrap yard and bought a Delco. He had to buy a longer fan belt and the guard over the alternator pulley no longer fit. It was did the same to his 454 and 495.
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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