I purchased a used 2010 Ranger RZR 800 50" and am currently replacing front end wear parts; bearings , bushings etc.

My question is this; After yanking a few times on drivers side axle , it wouldnt budge, i really didnt pull more than 4 times and it leaked quiet a bit of front diff. fluid, however i think i put more than the required 6.5 0z. in. Are the axle seals that easily compromised ? And also is the weakest point for leaking overflow (to much front fluid), the fill plug.? cause it appears it may be coming from there… Thanks!