   Pump assembly This method refers to the use of impact tools or machinery to complete the assembly process of the hub to the shaft, generally used for the hub with the shaft so that the transition fit or with little interference occasions. At the assembly site, the usual method of hammering with a hand hammer is to cushion the block, lead block or other soft material on the end face of the hub and knock the wheel in by relying on the impact of the hammer. This method of using cast iron, quenched steel, cast alloys and other brittle materials made of the hub, there is the risk of local damage should not be used. This method can also damage mating surfaces and is often used for assembly of low speed and small couplings.
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