- Drain oil into a container prepared.
- Turn the wheel unit to align the marks on the hub reduction gear cover in the horizontal position 1.
- Fill the wheel unit with an appropriate amount of new oil (up to the lower edge of the sight hole).
- Clean the mating surfaces of drain plug 2 and hub reduction gear cover.
- Screw the plug with the sealing ring.
- Install the wheel as per Chapter 5.15.2 “Replacing a flat wheel”.