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  #1  
Old 06-01-2002, 10:20 AM
DexterBFord
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Question 79 300SD-power steering fluid?????

My car is using power steering fluid, not on drive way. Any info on this. I just bought the power steering fluid filter ( don't know how to install it yet). Wondering where this fluid is going?
Thanks in advance.

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  #2  
Old 06-01-2002, 03:56 PM
LarryBible
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If the car were mine, I would take a pair of ramps, put them in the trunk, get on my ratty shop clothes and drive to the self service car wash. Run the front wheels on the ramps and start scrubbing the pump, hoses and box from below AND above thoroughly. Then, take it home raise it, get underneath and look for the leak.

I'm not familiar with your particular chassis but most filters are inside the reservoir. Empty the reservoir with a turkey baster or some such thing and you will probably find the filter.

Also, I strongly suggest that you go to the parts store and get some standard power steering fluid. Do not use Dexron or Mercon ATF. Since your car was built and the owners manual written, Mercon, etc have evolved for A/T use and are not healthy for the seals in your power steering system. If you insist on using ATF anyway, locate some type A. If you find and fix the leak then use Mercon in the system, you will eventually have another leak.

Good luck,
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Old 06-01-2002, 04:26 PM
Aaron's Avatar
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Dexron III/Mercon is absolutely ok to use in your power steering system. MB service bulletins state that it is ok in most all of their cars bar the W210 and some W140s and the newest cars. Those cars require special fluid which is only available from MB. As for the filter, you will find it at the bottom of the resirvoir once you empty it. Just take the spring off the shaft and take the little c-clip off and you will be able to pull the filter up and remove it. Drop the new one in and replace spring and retaining clip. Fill to cast mark on inside of resirvoir and start the car and bleed any bit of air which may have gotten in. To bleed it, just turn the wheel from lock to lock a few times. On the old old steering boxes, you have to crack open an 11mm bleeder screw and do it that way. Newer systems like yours are self-bleeding.
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Aaron
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Old 06-02-2002, 08:38 PM
Eberhard Weilke's Avatar
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Removing the filter...

...as Aaron said, remove the clip and the spring. On the bottom you will find something looking like a telefon dial. Remove that plate by means of grabbing it with a screw driver.

If it is the original, factory installed filter you fill find a brown filter ring. Throw it away. Under the ring a a little something holding the ring in place.

Since the new filter is a paper filter unit, don't forget to remove this something also.

Install the paper filter by pushing it all the way down.

Kind regards
Eberhard
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  #5  
Old 06-02-2002, 09:16 PM
Robert W. Roe's Avatar
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FWIW, my local mechanic told me to top my 1977 300D with PS fluid when the filter collapsed and I began to leak PS fluid. His words, "just make sure it's Power Steering Fluid ...
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Old 06-03-2002, 02:26 AM
Eberhard Weilke's Avatar
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The manual...

...and all the rest of the available service bulletins, workshop manuals and alike state the use of ATF for the power steering.

It is ATF and nothing else then ATF.

Kind regards
Eberhard

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