t walgamuth, that is exactly what I want to hear, I'm going to test drive a w126 maybe from a dealer to compare 'though I can consider mine is normal.Thanks a lot.
Sbourg, thank you for your time reading my post. I'm so sorry if I comfused you on the tittle of my post "hard to steer", what I mean to say is, the steering wheel is heavy compare to the car with a normal power steering system. Like t walgamuth said, it's on the heavy side.

benz makes the steering pretty stiff. also there is a lot of caster in most models which will make the steering a bit stiffer. the combination makes a car that wont go in the ditch on the autobahn if you sneeze.

it is a safety issue. it is comforting to me.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

I promissed to check the tag on the 91 420 a couple of days ago,but I keep forgetting. Sorry. I'll do better tomorrow. I'll check the 91 and two 86s.

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Auto Zentral Ltd.

t walgamuth, you make me feel so relax and worry-free about my power steering now, it seem's that I won't even bother to test drive a 126 anymore.
autozen, I don't know how this # goes but here it is exactly the way I copy from the pump;
7672900446 ZF
3032879 590
1264601480 82 bar
Thank you guys, I truly appreciate your help.

I Finally remembered to check the cars. I checked three 86s and a 91. The MB part # you have is the same as 3 of the pumps. I didn't check the latest # from MB in the computer, because the # might have changed. The type # Matches 3 cars and all 4 cars say 82 bar. So I'd say you have the right pump. Since it is possible someone changed pulleys, I checked diameters. All 4 have a diameter of 127mm. Hope this helps.

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Auto Zentral Ltd.

I'll check my pulley sometime today after work. I have an appointment @12:00 noon with a used car dealer today to test drive an '86 420 sel, I will let you guys know the outcome of the comparison. thanks a lot.

Well, just came back from the dealer, test drove an '86 and '87 420 sel. My conclussion is my power steering system is in need of repair. Mine is too heavy compare to '86 and '87 that I test drove. I'm gonna check the pulley and if the size is correct, I'll be in the junkyard this weekend. Any advice is welcome and will be apreciated. And of course I'll be greasing all the fittings of the front suspention including the rear.