Unplug the Oil Skimmer power cable and remove the Oil Skimmer from the coolant tank.
Remove the (3) screws  and the cartridge  from the oil-skimmer assembly.
Turn the cartridge to the other side. Remove the (4) screws  and the bottom cover  of the cartridge.
Remove the tubing  and gears for the Oil Skimmer.
Add grease  to the top cover  of the cartridge.
Put the tubing on the top cover as shown with the replacement gears.
Note: Make sure the ceramic scraper  is installed in the correct position on the top cover.
Install the bottom cover . Use the (4) screws .