if it is like a 190xt, first of all you need a shop manual. you have to torque bolt and preload bearings. anyhow
this is how you do it (if it's like a 190xt)
1. take the rear rocker arm housing off the tractor. (first drain fluids in transmission and final drives) 2. remove the metsl half moon do-hickey from both sides (they cover the end of the axles) 3. remove bolt and washer from axle you want to take out.
4. on the outside end of the axle remove the 4 bolts 5. go back into the inside of the tractor with a jack of some sort and start jacking the axle out of the axle housing.
I don't know what the torques are for the 185 or the preload of the bearing.