Case 580SR Service Manual page 751

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SECTION 41 - STEERING SYSTEM 25
Grease the O-ring (5) with hydraulic oil and install it
on the attachment.
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.
Press and turn the O-ring into position in the hous-
ing.
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.