The bearing at the rear end of the coupling of the screw extruder is damaged

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The twin-screw extruder had just undergone major maintenance and had been in operation for over a month when it was found that the thrust bearing at the rear end of the extruder’s coupling was damaged, with its needle rollers worn down. This equipment has been in operation for many years, and recently it has frequently experienced oil leakage from the oil seal at the rear of the coupling as well as bearing wear. Once again, oil leakage occurred in the reducer of another screw driven by it; the oil temperature was measured at 100 degrees. Upon disassembly, it was found that the bearing clearance inside the reducer was too large, causing the oil seal to leak. The variable-frequency motor of this equipment is 400V, 75kw, 50HZ, 1480rpm, but it often operates at a frequency of 60HZ. Is the issue caused by operating at an excessive frequency or by some other problem? Also, does adding too much oil to the reducer have any effects? Thank you all for your help.