Sometimes the dildo of fate arrives unlubed. Possibly that was also the case for the bearings on that wheel assembly. Time to check the storeroom to see how long the bearings have been on the shelf or if the new guy knows they need to fill with grease before installation.
Also check to see if the brakes were dragging. Had that happen on a car because the internal rubber sleeve in the brakeline collapsed; fluid could pump out but would not be allowed back. Wheel got to over 200F at the center.
If it's the brakes aren't there temp probes to detect overtemp?