Hyundai 35DS-7 Operation Manual page 130

(11) Grease O-ring with hydraulic oil and place
them on the tool.
(12) Hold the outer part of the assembly tool in
the bottom of the steering unit housing
and guide the inner part of the tool right to
the bottom.
(13) Press and turn the O-ring into position in
the housing.
5-23
5-79(1)
5-79(2)
5-79(3)
5-79(4)