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Old 09-23-2009, 10:04 AM
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Join Date: Sep 2009
Location: Atlanta, GA
Posts: 28
Hydraulic Suspension Flush

Hey I am new to this forum. Pretty Cool.

I bought a 91 300te about 2 weeks ago. It needs a few things here and there, but it is in pretty good shape as a whole.

It was in a slow speed accident in the front left corner and the hydraulic tank for the rear suspension is cracked in. I found a new one in town and got the MB hydraulic fluid. The old tank had quite a bit of black crud in it. I put the new tank on and I am wonder should I just fill it and close the lid? I am new to this whole type of system so any advice would be helpful. I thought it would be a good time to clean out the system if there is a way to do that.

Thanks in advance.

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Old 09-24-2009, 06:15 AM
cth350's Avatar
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Join Date: Dec 2000
Location: Long Island, NY
Posts: 3,848
almost that simple, but not quite.

The high pressure side of the system (basically everything between the pump and the shocks) can be dangerous to somebody unprepared for it. Any time you work with it, you should have safety glasses on (though many people don't bother; they've never gotten a face full of hydraulic fluid) and you need to depressurize the system before opening it (something you're not doing today, as you're on th elow pressure side).

For today, you're installing the new tank and having the return line (which is low pressure) drain into a separate container. Fill the tank, start the motor and collect and discard what returns. Then reconnect the return line.

That's bascially it, though keep a close on the fluid level in the resevoir, don't let it run dry. Also there is a means of bleeding the system from the valve. That shouldn't be necessary. But if you do it (search the forum for the technique), remember what I said right up front.

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Old 09-24-2009, 11:48 PM
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Join Date: Sep 2002
Location: Allentown, PA
Posts: 482
As cth said, fill fluid into "resevoir". The fill cap at top of pump is for power steering fluid FEBI 8972.

MB recommends Febi 2615 Hydraulic Fluid for the self leveling suspension.

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