The bottom half of that motor is a gear case with a worm gear on the motor shaft and a traveling shifter block that runs up and down the worm gear. Take that lower case cover off and see what you have inside...
The one in the picture I linked you to requires about 1 ounce of 10w oil to lubricate the worm and bearing. I've never seem the one you linked, so I can't help with how that one works.
Mike B
