Analysis of inspection: from the appearance point of view to the front cover cracking, remove the check ended mouth elliptical, shaft misalignment, resulting in unilateral magnetic force, resulting in the running resistance and stall, the bearing damage.

Repair methods: welding end caps, and eliminate welding stress treatment, only the mouth by correcting the replacement of the bearings and grease. The motor is running without vibration and overheating.

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