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#1
04-16-2010, 01:27 AM
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85 300SD heavy steering
My new to me 85 300SD has very "heavy" steering. I flushed the PS fluid and changed the filter but it made no difference. At a standstill it will turn left barely and right is almost impossible. Same while driving- left turns are easier than right. I took the steering stabilizer shock off with no improvement. Is this a pump or steering box issue or could it be alignment problem? I have not had an alignment done yet and the left front tire had wear to the cords on the inside. Is there any adjustment for the amount of power assist from the PS pump? In searching I have not found any mention of an adjustment, but those MB engineers never cease to amaze me and maybe there is an easy fix!!! (I'm an eternal optimist). Any thoughts on this? -Scott
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#2
04-16-2010, 01:55 AM
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Scott,
If there is no difference between steering the car with the motor not going & when the motor is going then chances are you have a power steering pump problem. Power steering pump failures are not that common. If it was me I would get a PS pump from a junk yard. I guess you may be able to get a kit or a change over one. It does sound like you have an alignment problem as well. Time to go over all the front end. Good Luck!!
__________________
Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort....  1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles  1987 250td 160k miles English import  2001 jeep turbo diesel 130k miles  1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#3
04-16-2010, 12:59 PM
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I just replaced the tie rods on my '84 300sd, and the alignment is awful, it isn't impossible to turn, but it is definitely much harder. I wonder if there is a way to test the P/S pump to make sure it's working correctly before replacing.
__________________
In the Garage: '84 300SD, 85K "The Princess" 2011 BMW 328I XDrive, DD
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#4
04-16-2010, 01:33 PM
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Scott, if you notice more power assit one direction and not the other my guess is the pump is OK. It is comon on 126's for the springs in the reaction valve in the gearbox to break. When broken will affect turning one direction or the other. The springs are not available, the box would need to be replaced.
Good luck, Chris
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#5
04-17-2010, 12:28 AM
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Quote:
 Every time I think I know all there is to know about these cars something new comes up. The cool thing is that usually quite a few people on this forum have already figured out how to fix whatever problem I may have. Thanks-Scott
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#6
10-29-2018, 06:03 PM
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It looks like its the springs for said valve that are the issue, explained in the first post, fourth paragraph here.
http://www.peachparts.com/shopforum/tech-help/249518-just-talked-chris-%40-c-m-hydraulic-good-info-here.html I can't be sure this is the problem, of course. Looks pretty likely though.
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#7
10-29-2018, 06:22 PM
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Could be a steering box and/or pump issue, but since the car is new to you does it look like the steering box has been adjusted as in possibly too tightly? Don't rule out bound up steering linkage e.g., idler arm or suspension e.g. ball joints. Disconnecting at the pitman arm and turning the wheels with the car lifted would help isolate/diagnose.
Good luck and keep us posted!
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#8
10-29-2018, 11:22 PM
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A tight steering box won't cause heavy steering, it will make you constantly over correct and overshoot your steering input.
__________________
1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily 1992 Mercedes 300D 2.5 202,000 - Pure junk 2000 Mercedes E320 Black - 136,000 miles - Needs repair Don't forget to grease the screw and threads on the spring compressor.
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