Manual top operation - Page 3 - Mercedes-Benz Forum
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#21 (permalink) Old 08-07-2012, 09:36 PM
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If you swap your 129 for a 107, you'll have your wishes ! They are all manual with a few exceptions for a very expensive conversion
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#22 (permalink) Old 08-08-2012, 08:31 AM
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Converting to manual operation? Problems with early model years...

Originally Posted by larrynh View Post
Hi ,

I'am in NH with a 1990 500sl . do you have any pic of what you did? My top will
not go up so I would like to make it easy to do manually Thanks for your post


I would strongly advise against conversion to manual operation, unless you absolutely cannot afford having the cylinders rebuilt. Manual operation eventually wears out the locks (and it is easy to damage the trim pieces around the locks when you use the soft top tool a lot), plus you risk damaging your canvas around the tonneau cover hinges. Keep in mind how much value you are adding to the car by fixing the top cylinders now, as opposed to going down the road where you have to find replacement locks later on.

On early model years, you may have to take up to eight cylinders out in order to facilitate manual operation. The reason is, the piston seals can swell up very tight and eventually make it next to impossible to move the locking cylinders and the tonneau cover lift cylinders manually.

Please see the following instructions on our website's FAQ page on how to lock your top without cylinders in place:

Hope this helps,


Top Hydraulics | Rebuilt Convertible Top Hydraulic Cylinders - Top Hydraulics, Inc
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Top Hydraulics, Inc

Upgrading/rebuilding hydraulic cylinders, pumps and valves for Mercedes R129, R170, R171, R230, W124, W208, W209

Aston Martin, Audi, Bentley, BMW, Cadillac, Chrysler, Ferrari, Infiniti, Jaguar, Lamborghini, Lexus, Mini Cooper, Peugeot, Porsche, Rolls-Royce, Saab, VW

Also manufacturing hydraulic lines!

Convertible top hydraulic system diagrams and DIY instructions:
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