Both the transmission nut and the pump drive nut tighten clockwise. As trasmission nut is doing the driveing and the pump nut is being driven they both tighten when in use. You do not want that shaft between pump and transmission tight. It should be free fit or you will damage pump. It floats on the couplings. Should not flop around but just float.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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