1984 300sd steers hard to the right almost
all the time. I changed out the power steering fluid today, and it turned easy once. then went back to normal. found one lower ball joint bad and replaced it, did not change at all.

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David A Black

The problem is a broken or stuck valve inside the P/S sector. It should be replaced.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

It sounds like a broken proportioning valve spring.This causes assist in only one direction. Jack up the front of the car (both wheels off the ground)and start it up. If its the proportioning valve the steering wheel will turn all by itself. There was a company a few years ago selling the springs but you'd be better off replacing the steering box with a rebuilt unit.
Randy D.

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W.R.Durrance
ASE Master Tech
Mercedes Tech 20 Years
68 250SE
68 SAAB 96 Ice Racer
69 300SEL 6.3
70 300SEL 3.5
81 300TDT