I have a 2004 polaris sportsman 500 h.o. if I put it in 4×4 only 3 tires work. The front right doesn’t work. So I checked the hub and it was bone dry and dirty. I put the quad on Jacks and put it in 4×4 to see what it was doing and the front right axle spins but the hub doesn’t. Any ideas on what the problem could be?