180 series john deere riding lawnmower.how do you remove the rear wheels?

Remove the plastic center cap(pry or pull off)

Remove the C-clip from the axal(or snap ring)

Pull off wheel.

Do not loose the little steel key that fits in the slot on the axal and inside the wheel.

To replace:

replace wheel on axal

Line up slot in wheel with grove in axal

Slide in little steel axal key in grove

Replace C-clap or snap ring on axal

Drive off down the road..Thats it