Borbin the 🐱

To install the pinion gear, warm up the casing and press in the pinion gear using the old pinion gear as a guide. If you don't have a press, you can carefully tap it in. It doesn't take much force to get the bearing in.

The new pinion gear seems to be a bit longer than the old one. Had to grind off the end of the shaft.

Insert the needles of the needle bearing using sticky grease. Be sure the bearing hole is clean.

The 3304 bearing need to get pressed on to the pinion gear shaft. I don't have a press, so I used the machine vise. Used a 0.3mm shim between the bearing and the gear.

Everything is ready to assemble. The bearing nut (large yellow colored nut on the right) needs to hold the pinion gear without any play. Use those star shaped washers in case.

Be careful to secure the hub to not damage the main seal and to not block the drain hole by misaligning the seal.
Check if the main rubber seal has the correct seat at the bearing surface of the hub and the spring is in place. This is one of the main reasons for leaking FDs.

The final drive is assembled and can be installed.

New final drive in service.
Very quiet and does not get hot after a longer ride 😺