Re: after I get this out, what do I put back in?
Ok it looks like you have stuff wrapped around the axle shaft behind the hub , so you should pull the hub off and remove it. and also replace the back seal , when things get wrapped around the seal gets worn out. Those can be found from several local sources depending on what's around , auto parts store is a good one , tractor supply, or if you look in the yellow pages their is a industrial supplier or trailer part suppliers or you can order on line. While you have the hub off you should thoroughly clean and inspect and repack the bearings with new grease , and no don't mix grease types some do not mix well .You can find marine grease at any parts store , Wal-Mart or trailer supply places but you do want to use a marine type simply because it will get dunked in water, and it helps. and you may was well do it to both hubs while your into it , it will save you time later.