Our factory has several CD1, MD1 electric hoists, and the brake failure occurs frequently in use. After inspection, it was found that the looseness of the screw 3 (Fig. 1) of the fastening coupling limits the axial movement of the motor shaft 4, so that the fan brake wheel cannot be in contact with the cone brake ring (not shown). Causes the brake to malfunction. Most of these failures occur after lifting heavy objects, which are concealed and sudden.
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NINGBO EASTKEY ILLUMINATE APPLIANCE CO.,LTD , https://www.eastkeylighting.com