I am in the process of replacing the spindle bearings on my D110 mower deck. When I took them out, I noticed that the lower bearing (closest to the blade) was missing the seal on the inner surface of the bearing. Since they are supposed to be sealed bearings, they really shouldn't have to be greased. Is the missing seal and the zerk fitting to allow us to grease a normally "sealed" bearing? If so, then wouldn't the spindle have to have a significant amount of grease to keep it in contact with the bearing? That's a pretty big cavity to fill.
Seems to me to be a poor design. I've only got 34 hours on the tractor and the lower bearings are shot. The upper ones that are completely sealed are still in good shape.
Any advice as to whether I should remove the seal on the new bearings to match the removed ones?