(11) 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. (780-3A) 5-79(3) Press and turn the O-ring into position in the housing. (12) (780-3A) 5-79(4) (13) Draw the inner and outer parts of the assembly tool out of the steering unit bore, leaving the guide from the inner part in the bore. (780-3A) 5-80(1) Installation instructions for lip seal Installation instructions for lip seal Lubricate the lip seal with hydraulic oil and place it on the assembly tool. (14) (780-3A) 5-80(2) 5-39