Figure 1 is a structural diagram of the drive shaft of the single and double-stage belt reducer for cooling towers produced by our factory. When installing the bearing, first press the oil seal into the shaft oil seal chamber, and then press the bearing cap onto the bearing housing. Due to the action of the step of the output shaft shaft extension, it is not easy to install. The reason is that the oil seal lip is soft and encounters the step easy (?) lip, the small spring is easy to pop out, and is not easy to be found, resulting in oil seal damage. When installing, it is often necessary to hold
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