ok I told you the part you are going to have to install to fix the issue ,What more of an answer are you looking for ??
Lubricating will not help you have to replace the parts
Kitchen -Aid even has a service pointer on this issue.
no way to fix or repair 1000`s have tried ,,,,without the manufactures revised kit.
That is the ONLY fix.
Home Appliance Technician
29 years Appliance Field 15 yr with Whirlpool Corp. 9 yrs Whirlpool Technical Assistance Line