Hydraulic SCREW does not move or turn at all (Trying to manually open soft top) - Mercedes-Benz Forum
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post #1 of 18 (permalink) Old 07-02-2019, 12:56 PM Thread Starter
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Safety Lock SCREW on hydraulic reservoir is stuck (Trying to manually open soft top)

Hi guys, in my '04 CLK320 conv. I accidentally broke a limit switch, closed the roof on it, now stuck.
Now I'm trying to Manually open the soft top, I don't have the additional locking mechanism, only the screw (cf. Owner's manual P. 356). So I only need to turn the screw counterclockwise . Problem is this thing just WON'T move at all, I mean like even with excessive force that hurts my hands/fingers. Could such a screw be seized or is there another reason? Am I putting it at the right place?
Here are pictures of what I'M trying to turn. Ps I'm using a 5mm Allen (6mm doesn't fit ) (the factory one is no where to be found in the cars documentation case).
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Last edited by michobebe; 07-03-2019 at 05:09 AM.
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post #2 of 18 (permalink) Old 07-05-2019, 08:31 PM
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No, that's the wrong one. It's the one on the left, directly under the hose clamp screw.

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post #3 of 18 (permalink) Old 07-06-2019, 12:28 AM
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A photo I have seen shows one which protrudes from the block...where Rodney said ..
could your one be missing ?
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post #4 of 18 (permalink) Old 07-06-2019, 12:46 AM Thread Starter
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Thank you both! That's what I was afraid to hear... I think something is missing or broken in mine. Here are 2 pictures to illustrate.
what do you think ?
could it be moved manually with pliers, or maybe do something with that little pin/tiny hex? (the one over that left hole if you look closely)
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post #5 of 18 (permalink) Old 07-06-2019, 02:12 AM
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Looks to me that your screw is missing ,,,the pin would enable the screw to press on the circular shape in the middle,,,
maybe you can exert a force onto that somehow ???
No guarantees that would work ,,but who knows ?

PS , Have a search below for the screw ,it might be there somewhere.
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post #6 of 18 (permalink) Old 07-06-2019, 06:54 AM
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+1 on what Benzyle said. Unfortunately, that screw is not listed as a separate part, so if it is missing, you'd have to find a replacement on the secondary marker.

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post #7 of 18 (permalink) Old 07-06-2019, 07:11 PM Thread Starter
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Oh Lord! Ok so if the main goal is to turn the round thing deep inside I could use different methodes to maybe for example scorch and make an indentation in the shape of a flat screwdriver in order to use one and turn the round thing inside.
What do you think of that idea? Because sourcing a complete reservoir only.for that screw would be a huge deal.
Does the little pin have any fonctionnal role ?
Thank you very much guys

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post #8 of 18 (permalink) Old 07-06-2019, 09:19 PM
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No ,,,you misunderstand ..
The little pin just provides a stop for the screw to push against when rotated.

Have you searched for the screw in the areas below the unit ? A previous owner must have turned it too much ,,unscrewing it all the way out ,,maybe they dropped it and it is still down there somewhere.

Or maybe you don't need to do anything ,,if the screw had to be unscrewed ,counterclockwise , then because it is missing ,it is like that has already been done....If you had the screw it should only be turned anti clockwise one turn.
I now think that you don't need the screw to be able to manually open and close your roof ,,,you need two people ,follow the instructions in the manual. Be careful.

Perhaps you can now move the roof manually ? Have you tried ?

Last edited by Benzyle; 07-06-2019 at 09:39 PM.
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post #9 of 18 (permalink) Old 07-06-2019, 09:52 PM Thread Starter
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Ok my bad for misunderstanding. Yes I get it. Yeh I'll be looking for the screw early in the morning.
Actually I tried lifting the roof with a very strong friend of mine and we failed. I don't have the factory ropes so I made some of my own, then placed it behind the hinge, in front of the safety lock, closed the trunk and tried to lift, with no success.

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post #10 of 18 (permalink) Old 07-06-2019, 10:51 PM
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Originally Posted by michobebe View Post
Ok my bad for misunderstanding. Yes I get it. Yeh I'll be looking for the screw early in the morning.
Actually I tried lifting the roof with a very strong friend of mine and we failed. I don't have the factory ropes so I made some of my own, then placed it behind the hinge, in front of the safety lock, closed the trunk and tried to lift, with no success.
Sorry to hear that ...I am not sure what else to suggest ,,
I'm afraid that even if you find the screw it will not solve your problem...
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