After loosening the lock nut, remove the four bolts securing the upper crankcase cover and turn the adjusting screw to move the cover away from the crankcase.
Remove the top cover and take out the knuckle shaft assembly with the toothed sector, which occupied the middle position after setting the front wheels to the straight-ahead position.
Check the clearance by the height of the adjusting screw. If necessary, install a larger adjusting ring (or less) thickness. Remove the retaining ring, adjusting ring and adjusting screw.
Note: After installing the retaining ring, the adjusting screw should rotate freely in the socket without binding.
Remove the mounting ring 1 (see photo) and the seal 2, marking the position. Press out the needle bearings 3 and 4, remove the mounting washer 5 and the seal 6 together with the latter.
Remove the valve cover and the outer ring of bearing 5. Check the condition of sealing rings 1-4.
Remove the bearing sleeve and needle bearing. There should be no gap between the bearing sleeve and the needle bearing (needle bearings are available in four different sizes as spare parts).
Press the intermediate cover and piston out of the steering gear housing. Check the condition of the sealing rings 1-4.
Remove the worm shaft from the piston and remove the balls (23 pieces). Remove the intermediate cover and the ball circulation guide tube.
Check the condition of the thrust needle bearing 1 (see photo), thrust washer 2, grooved ring 3 and Teflon ring 5.
[The original entry can be found on the portal: BMWMAN]