This instructable shows how to repack your axle bearings and install a new freewheel body (if you need one).
Step 1: Remove the wheel from your bike.
Step 2: Remove the quick release skewer.
Step 3: Remove the cassette
Step 4: Remove the cassette...cont.
Step 5: Remove the axle
First remove the jam-nut and washer from the axle then remove the bearing cone nut. This holds the bearings in place.
Step 6: Remove the bearings
Step 7: Remove old freewheel body
Insert appropriate sized allen wrench into freewheel body and unscrew. Set aside the old freewheel body and place the retaining bolt with all the other stuff you need to clean.