I'll assume its the standard jobbie, never done it on an mx83, but its all the same.
You will need a new split pin, but the old nut is good.
Pry out the rear seal, removed the old bearing.
Remove the front bearing
Hammer/Press out the old races.
Press in the races, or use the old races angle-grinded down to hammer in the new race.
Install greased bearings and seal.
Grease up the spindle and bolt it back together with the correct torque.
Job done.
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