valid points Greg, unfortunately, the Sportsman wheel bearings cannot be packed that way
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I’d have to have one in hand, but I bet with a small pick tool, that rubber seal pops right out. Most of these atv bearing aren’t truly sealed. More like a dust gaurd. The grizzly ones look similar. And this tool is really handy for packing grease as it’s universal for size.
I bought one like the below, basically take the axle nut off, undo the caliper slide the axle back enough to put greaser in and add pumps of grease.