Sorry for the dumb questions but I'm a newbie to the Ranger stuff. I have a new to me 1994 Ranger Trail trailer and have never delt with a disc brake hub. Is this one of the Ranger oil bath hubs? If so,I do not see any way to fill it if it is. I want to check out the bearings for wear and not damage anything during disassembly. Are these caps threaded or pinch fit? It looks to have some sort of RTV sealing the cap on now. Thanks for any help, tips or advice yall could offer.