If the motors still work, and the pinion is worn, then replace the pinion.
Martin Gear, Browning, Boston Gear, and others have lots of stock gears.
Identify your pitch and replace it.
Your local gear and belt distributor can help with that.
You may neet to bore it out for your motor, so measure your shaft size, and bore the gear to the same size.
If the shaft is chewed up, then machine it smooth and then measure for the pinion.
The motors were made special for Westinghouse, and could only be replaced through them.
They went out of business last year.
Not surprising as they were selling 35 year old motor/drive technology.