The steering box has a valve(spool) that allows the exact proportion of fluid for both rt & lt turns. MANY times the spring on either side of this valve will break(or weaken). That will cause hard steering on that side of this valve.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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