Roof Hydraulic pump questions - Mercedes Benz SLK Forum

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#1 Old 10-09-2013
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Roof Hydraulic pump questions

Can someone tell me if there are pressure relief ports on the hydraulic motor that would open and "leak or spray" in a pressure overload situation? I have never had a pump problem until my left trunk lid actuator developed a major leak. I am thinking that the leak,causes the pump to run excessively, over pressurizing the other side causing a Pressure relief situation. Second does anyone know where I can learn about the hydraulic pump to potentially troubleshoot it? I have scoured the internet and found no info...just places that will repair it...
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#2 Old 10-09-2013
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It is more likely that the seal on the end of the hydraulic cylinder has failed. There is ample information here on this site to make you a pro at fixing them. Use the search button at the top of all pages.

I have just done mine and they no longer even seep.
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#3 Old 10-10-2013
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I definitely have a leaky failed cylinder, but there is fluid leaking at the pump which is opposite to the failed cylinder....and judging from the spray that occurred, it came from the side of the pump.
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#4 Old 10-10-2013
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there is a lot of info here about this system, but I am finding there is little about the pump itself.
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#5 Old 10-10-2013
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Have you opened the pump to add fluid?
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#6 Old 10-10-2013
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Yes...filled from the top and there is no fluid on top of the unit.
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#7 Old 10-10-2013
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Is the leak (spray) coming out on the side of the pump that you see when you take off the plastic inspection panel? If so the could be coming from the pressure relief bolt (bronze) it could be slightly loose or cracked. This would also cause the pump to run as it is losing pressure.
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#8 Old 10-10-2013
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I was not able to see where the leak was coming from, but am pretty sure it is from the side of the pump. I have the inside of the trunk all apart as I am replacing the trunk cylinders. I am wondering if there is a pressure relief system that opens in the event of an overpressure situation, as I see two silver "ports" on the side that look like two small ball valves. There seems to be very little on these sites as well as on the internet that gives more in depth info on these pumps...if it is there...I can't find it. I have sent two messages to Top Hydraulics, but they have not replied.
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#9 Old 10-10-2013
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With all the lines leading off the top of the pump, I would suspect one of those lines to have cracked and leaked.

You may want to operate the top with a small gopro video camera or cell phone on record, in the truck recording the pump and lines actions during operation.

It may show the leak origination.

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#10 Old 10-10-2013
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I found a safety valve as part of the hydraulic schematic. I am yet to find any description of its function. I can tell you that the normal working pressure of the pump is 2610 PSI. So things need to be torqued down pretty well.
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#11 Old 10-11-2013
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I think that will be my next step..replace the cylinder and operate with a camera recording the events..hope the Gremlins aren't camera shy...I did talk to Klaus at Top Hydraulics. To his knowledge, there is no external pressure relief port. I am wondering if I just left the bronze pressure relief screw open that one time. Ok will get back w details...Thanks for all of your input.
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#12 Old 07-06-2014
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I am bringing back from the dead this thread just to state my 's Blue problem here. I have leak of roof's hydraulic fluid that thankfully is not coming from any cylinder but from the metal part of a hose that connects to the pump itself. Roof is working fairly fast (for now ) but the fluid level is running low bellow mid level. That is one problem. My question to this is that can i replace the metal part that connects to the pump, or i must replace the whole line?
Second problem is that although the roof is open for good, when cruising and after going over a few bumps on the road, the roof's switch light turns on and the warning buzzer rings like the roof is not fully open. I have checked the switch under the b-pilar (passenger's side) for corrosion and sprayed a bit with anti-corrosive spray but the problem persists. Is there any way for those two probs to be related? If no then do i need a new “roof open” switch or can be repaired somehow?
Thank you in advance ,
John.
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#13 Old 07-06-2014
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The hydraulic cylinder, line and fitting are all one part.
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Vario roof
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SLK 230 320 32AMG
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#14 Old 04-03-2016
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1998 slk 230 my hydraulic roof pumps leaking from the valve next to the pressure relief valve spraying everywhere can i buy a new valve whats it called
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#15 Old 04-03-2016
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There is supposed to be a copper seal there, is it missing?
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#16 Old 04-04-2016
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no the copper washer is still there could it be the tiny oring
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#17 Old 04-04-2016
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still there the copper washer
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#18 Old 04-04-2016
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Make sure it's in good shape, or just replace it. I found it was easy for this seal to become misaligned if not careful. These are, in theory, one-time-use items.
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#19 Old 04-07-2016
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hi do you know where i could buy 1 from i have tried and they just want to sell me the full unit
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#20 Old 04-22-2016
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Did you find any information on the pump itself? I am interested as well to find out how the pump works.
Thanks for the thread!
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