Excessive torque on lamellar coupling during reassembly causes axial pulling force on motor bearing, leading to damage.
The marks formed on the inner ring and outer ring of a 75 kW motor bearing. Lamellar coupling is an application that facilitates disassembly of the pump without dismantling the motor used between the motor and the pump. Excessive torque on the lamellas during reassembly pulls the motor or pump shaft and creates axial pulling force on the bearing. This leads to bearing damage. We can call the fault in these pictures an Example Pure Axial Load case.