I agree with Darren, find the correct lube, it may only call for a heavy oil. Wheel bearing grease may me too heavy and have fillers that aren't compatible with the speed the spindle runs at. A truck wheel only turns at 4 or 500 rpm (if faster warning lights show in your mirrors) your spindle I would guess is a few thousand. Over packing the bearings can cause the rollers to slide rather than roll.
My vertical mill has no lower seals either, guessing its to let the oil circulate out as you relube and would be a problem with cuttings getting under the lip.
My vertical mill has no lower seals either, guessing its to let the oil circulate out as you relube and would be a problem with cuttings getting under the lip.
Free advice is worth exactly what you payed for it.
Greg
Greg