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Water cooler motor repair training One of the major failures of water cooler motors is the failure of the bushing and bearings of its doors. This failure occurs due to the wear of the bushings and its parts, or excessive tightness of the belt and damage to the impeller. If the door is a bushing, it can be turned into a bearing door by turning, or the door can be replaced completely, or replaced with a bushing model. To extend the life of the cooler motor and bushings, the belt tension should be checked annually, the cooler impeller should be washed with water, and the bushings and bearings of the cooler and its motor should be lubricated.