I'm not sure where the right place to post this would be, but here goes.
I bought this DW745 Type 2 saw off of Facebook Marketplace. I think it was abused. I replaced both of the elevating shafts (5140100-04 Diagram # 82 & 5140100-05 Diagram # 84). I also had to replace both of the bevel gears (5140061-65 Diagram # 56).
The aluminum housing seems to be okay and the lifting shafts move in and out without much resistance. I'm still getting this chunky movement when I raise and lower the blade.
I'm looking for advice before I go though the whole process of replacing the entire aluminum housing (Gear Case A25607 Diagram # 213) on the motor.
As others have said it should be quiet and smooth.