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Old 01-27-2003, 02:16 AM
Posts: n/a
Power Steering Filter, where and how to change?

Could someone post directions on how to (pictures are great!) change it or point me in the direction where to look? I've searched on how to change the power steering filter but didn't see any postings related directly to the 300 series diesels. I've looked at the power steering reservoir on my car and on other cars at the local pick and pulls, I figure the filter is at the bottom of the reservoir, but I'm not certain how to get to it and change it. Unfortunately, the readily available manuals for the 300's are sorely lacking in detailed information on our cars. Any info you may have on the filter change procedures and any manuals that you may recommend is greatly appreciated.
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Old 01-27-2003, 06:33 AM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,877
Remove the top of the power steering fluid reservoir, remove the fluid using a Mighty Vac or some other device to suck it out and when you get to the bottom of the reservoir you will see the filter. Undo the nut on top of the threaded rod, remove the spring and you should now be able to take some needle nose pliers and lift the filter out.
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Old 01-27-2003, 08:59 AM
The Safety Geek
Join Date: Jun 2001
Location: Sudbury, Massachusetts
Posts: 252
Engatwork is right on target. The procedure is simple. the nut on the top of the post is 10mm and just snug. If you want to change the filter without draining the fluid, use a small needlenose and 'hunt' for the rond holes in the top of the old filter. A book that describes the entire process is the Mercedes Bible for w124 cars. If you need the author, I'll check at home; if you want photos, I can post pictures of the pages in the book that relate. Let me know, but, in the mean time don't be affraid to try the replacement based on the good advice from Engatwork. Good luck.
1995 E320 40K
1999 Tahoe 90K
2002 JX8 Sport 43K
2005 Volvo s40 65K
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Old 01-27-2003, 01:12 PM
Registered User
Join Date: May 2001
Location: Charleston, SC
Posts: 237
You may also want to consider complete evacuation method. By using sucking method, you are only evacuating a small portion of fluid (over half still in lines and steering box) and you will need to repeat several times after running to get a high proportion replaced. Other method, while a little more complex, involves disconnecting return line and flushing into a container until fluid runs fresh (while adding to reservoir) which is easiest on a W123 or simply placing a small clear hose into the return line from inside reservoir and draining into a container while adding fresh fluid which is the easier methiod on a W124 car. Either way, you need 2 persons to do this correctly to avoid pump running "dry." The W123 method has been explained by an off-site link posted before.

Good luck.
2008 GL320CDI 6K
1970 280SL 112K
1982 240D 210K (Sold)
1973 220D 220K (Sold)
1967 200D 160K (Sold)
1992 400E 139K (Sold)
1988 300E 148K (Sold)
1987 300D 257K (Sold)
1991 300E 108K (Sold)
1987 300E 131K (Sold)
1978 300D TMU (Sold)
1980 300D TMU (Sold)
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Last edited by CarolinaMBZ; 01-27-2003 at 04:09 PM.
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Old 01-27-2003, 03:24 PM
Registered User
Join Date: Mar 2002
Location: Western, PA
Posts: 429
If I recall, TX Bill has a sight that has this on it. Its a real easy job.
1982 300 D turbo, 183,000 mi
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