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You have to loosen the locknut, then loosen the assbackward nut/collar in to get the ring off that locks the axle inplace. You might have to heat the nut and collar nut with a propane to get it loose.
You need two wrenches and two cheater bars. If you plan on doing your own work on the quad in the future, buy the special axle nut wrenches. Rocky Mtn ATV should have them.