OL errors usually mean that the washer is overloaded or the motor is working too hard to move the tub relative to the drive shaft during agitation of the load. For an overloaded washer, removing some items can help. However, if the bearings have failed or the shaft is corroded, then the hardware needs to be replaced. One way to check: run the washer with the tub empty. Do not add any detergent. If the OL error persists, then you have to identify the specifics of the hardware fault. A parts list for the WTW7300XW0 is here:
https://www.partselect.com/Models/WTW7300XW0/ . There is a tutorial for replacing the parts on some Whirlpool washers here:
http://techanswerslive.com/troubleshooting/kenmore-elite-oasis-washer-f51-error-code-explained/ . Whirlpool manufactured this model for the Kenmore label.
If your washer is older than you may want to consider replacing it. If it is covered by the original warranty, contact Whirlpool for a service call. I hope this helps.
Cindy Wells