leveling sys '80 300TD

The leveling system on my '80 300TD sometimes sticks on "max jackup" When this happens the car feels like a bunkboard (or a big rig w/o a load) . As I
said only sometimes does it do this. When it does it, it makes a sound sort of like a power steering pump at the end of its reach, sorta "whaaaaaa". Any ideas on curing this? Also any MB sites on repairing ect link would be greatly appreicated. Thanks, lyndo
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