The main purpose of a key is to transmit torque, but prevent larger component failure when things go wrong. This assembly is then inserted into a hub. A keyed shaft has a small recess where a key is placed in. We are probably all familiar with keyed shafts because this type is predominant in the industry. Shafts come in two varieties: Keyed and splined. However, there are three options to get great alignment with a pump or motor. This is not ideal and will definitely wear out the spider coupler faster. Each loading of the jib changes the alignment if only for a few seconds. Even if we get all of these things perfectly aligned, which didn’t happen, if the jib is loaded to this side, the stiffness of the frame causes these to shift.Washers were used to shim and they have discrete shimming heights which limits adjustment. The aligning of the shafts is entirely done by positioning the engine.As temperature and humidity change, so will the height and angle of the engine. The motor is mounted on a piece of wood.The pump (left) is mounted on a thin piece of flat steel and cannot be adjusted for angularity.The example here, a log splitter, is almost exactly how not to do this. It can mean the difference between a long-lasting system and one that constantly needs maintenance. Keeping your pump and motors on the same center and parallel is critical and often difficult to do.
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