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Old 02-09-2003, 10:14 PM
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Join Date: Jan 2003
Posts: 236
91 560SEL hydraulic fluid maintenance

what is the recommended interval for flushing the hydarulic fluid?
Is there a procedure on how to do this? Is there a bleeder, or do I siphon the fluid out of the reservoir? Do I need to bleed it to evaluate entrapped air?

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Old 02-10-2003, 12:49 AM
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Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Not sure what the interval is, but the proceedure is pretty simple.

Remove the return line from the resevoir cap, attach a piece of clear tubing to the line and put the other end in an empty milk jug, start the engine. The pump will begin to pump the fluid out and it will collect in the milk jug. Keep the resevoir topped up with new MB hydraulic fluid and left it run until clean, clear new fluid is passing through the clear tube. Shut the engine off, replace the suspension filter and reattach the return line. Should take about 2 quarts of fluid to purge the system.
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

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Old 02-24-2003, 03:56 PM
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Join Date: Jan 2003
Posts: 236
just flushed my hydraulic fluid and changed the filter as well. It took about 3 liters before i saw clear fluid flowing, so i consumed 4 liters total to flush the system.

thx for the tip in flushing .....
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