No maintenance...
This is a no maintenance item unless you notice grease coming out from around the seal during inspection or in the event you replace the bearing and seal.
If you want to check and fill it, you need to remove the bearing cap. When you take out the 3 small bolts that hold the cone on, tap it gently with a rubber mallet or the palm of your hand. You want to see the seal break in the event there is a little water in the cap. This is important because it will tell you if the seal has been breached.
When your ready to put the cap back on, fill the inside of the cone with your synthetic grease. Make sure your "0" ring seals are in good shape then, put the cone back on.
That simple..................:cheers: