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The W123 chassis covers 240D's, 300D's, 300TD's, 280E's, and several other models of Mercedes coupes, sedans and wagons from model years 1977 to 1985.

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Why does my 80 123 300TD Wagon body roll excessively?

I am restoring a 80 123 TD wagon. Just replaced the front steering linkages, idler arm, tie rods, drag link, steering stabilizer and wheel bearings. Just had it aligned. Rebuilt the SLS pump and rear control valve. Checked the accumulators with the soft end of a pencil eraser, the rubber is right at the entrance to the port. The car is level and the SLS is now working to keep it level. Noticed this weekend when avoiding a pothole at 45 mph, the car excessively body rolled to the point I could tell it would get out of control at a higher speed. The sway bar links are in place at the rear and the front bar is attached to the upper control arms. The tires are new goodyear touring tires. I have other 123 coupes that are quite stable with these sorts of maneuvers, so I do not understand what is causing this handling issue.

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Service manual states that method to refill SLS system is to run engine for approx. 1 minute at medium speed. While filling up, load vehicle rear in trunk with approx. 150 kg (330 pounds) or hold down so that level controller can be set to "filling".

Filling position is when the level controller valve arm is in the upper position (above horizontal).

Manual states system can also be filled with connecting rod disconnected on lever of level controller in position "F" (filling). For this purpose, run engine at medium speed for approx. 30 seconds. Then mount connecting rod again.

Summarizing this, it simply means the SLS level controller valve must be in the filling position (lever moved up) to allow circulation of hydraulic oil, to purge air from system. Engine running at "medium speed" (roughly 1,500 - 2,000 RPM) increases flow through the valve enabling the bleeding process to move air bubbles to oil reservoir. After servicing the SLS hydraulic system, If the vehicle is driven without any significant load in cargo area and bleeding process is not performed, rear suspension stability is compromised due to air accumulation in system.

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Jeff Pope zal eeuwig dankbaar zijn.

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