Hello, pulled my lower unit for greasing and found some oil in the drive bellow I have searched but can’t seem to find a good write up for replacement. I know I need the spanner wrench. And also have searched for the seal and get several different seal part numbers.

thank you for any help!

The serial number of the drive will play a part in which one you will need. The below vid is pretty good but doesn't provide this like preload which is found in the manual. I can provide once the serial number is known

The vid is just for the seal, and if you find there is other issues then will need to go deaper