Case 580SR Service Manual page 753

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SECTION 41 - STEERING SYSTEM 27
The spool set will push out the assembly tool guide.
The O-ring is now in position.
Turn the steering unit until the bore is vertical again.
Put the check valve ball (3) into the hole indicated in
the picture.
Screw the threaded bush (4) lightly into the check
valve bore. The top of the bush must lie just below
the surface of the housing.
Place a ball (20) in the two holes indicated in the pic-
ture.