I bought a remanufactured steering box because the original in my '81 300SD was leaking. Installed today and now it doesn't want to turn to the left! Turning right is just as smooth as the old box, but turning left requires WAY more effort. Only happens with the wheels on the ground - in the air is easy either direction, engine on or off. Drove it around the parking lot thinking system just needed to be bled, but after 10 minutes of driving around turning the wheel back and forth, no change. Tried adjusting the box by turning the allen bolt on the top clockwise, no change.

Looking under the car, nothing appears to be binding. Steering was great with the old box, just was leaking like a sieve. Did I get a bad one?