r170 trunk lid hydraulics won't lower - Mercedes Benz SLK Forum

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#1 Old 02-17-2014
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r170 trunk lid hydraulics won't lower

I recently got the hydraulics rebuilt on my 01 slk and everything seems to be working but my trunk lid will not shut. If I open the top it will go all the way to the point where the trunk should close but the pump keeps running and the trunk lid continues to stay up. If I close the top it does everything but close the trunk. If I push the trunk down and lock it in, it will finish and raise the rear windows. But if I don't close it till it locks it raises the trunk lid instead of closing it. Any ideas?
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#2 Old 02-17-2014
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Quote:
Originally Posted by dukeoffl View Post
I recently got the hydraulics rebuilt on my 01 slk and everything seems to be working but my trunk lid will not shut. If I open the top it will go all the way to the point where the trunk should close but the pump keeps running and the trunk lid continues to stay up. If I close the top it does everything but close the trunk. If I push the trunk down and lock it in, it will finish and raise the rear windows. But if I don't close it till it locks it raises the trunk lid instead of closing it. Any ideas?
Very unusual . . . Not a high probability, but see that you have enough fluid. (From the time I installed my rebuilt cylinders to the time I cycled it a few times, the fluid level went almost from the top line to the bottom line.) And although it seems obvious, make sure nothing is interfering with the trunk lid's path and latches. Try opening and closing the trunk lid manually (reversed, for the roof) and see if you notice any sticking points.

How far up is it when it stops going down? (The windows won't go up until the lid down switch is made, so it seems as if your only problem is in that last bit of travel . . . )
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#3 Old 02-17-2014
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It wants to open up all the way. It doesn't even try to lower. And if I do try to push it down by hand when I hit the switch it just opens the roof back up as high as it will go.
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#4 Old 02-17-2014
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Here is a link to a troubleshooting guide http://www.benzworld.org/forums/r170...ml#post3581940


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#5 Old 02-18-2014
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Originally Posted by dukeoffl View Post
It wants to open up all the way. It doesn't even try to lower. And if I do try to push it down by hand when I hit the switch it just opens the roof back up as high as it will go.
So it seems like there is no physical obstructions to the lids movement, could still be a lack of fluid if it's really low. The trunk lid cylinders are where most of the hydraulic fluid is needed.

Did you put the hoses back in the ports? (Or did someone else?) Make sure they are in the right holes. There are numbers both on the hoses and the locking plate for the ports, they are hard to see in some instances, but they should all match.
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#6 Old 02-18-2014
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When I had our rams rebuilt, it took a while for everything to work properly. What I think finally helped was to loosen the pressure relief screw after cycling the roof a few times. I did this three or four times, then everything started working like it should. Good luck.
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#7 Old 02-19-2014
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So have you checked the fluid yet?
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#8 Old 02-25-2014
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The fluid level is fine. The switch that tells it the trunk is out of the way works cause the top comes down. It just keeps pushing the trunk open instead of pulling it down. There is an extra wire I noticed by the pump that isn't connected and I'm not sure it's suppose to be. It's in the pic on top of the pump label
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#9 Old 02-25-2014
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OK, I think the wire is for the 6 disc. There only appears to be 9 switches and all those wires are connected correctly. All hydraulic lines are connected correctly to their numbers. Even if I semi lower the trunk with the only 2 steps left to closing are lowering the trunk and raising the rear windows. It will raise the trunk lid back up instead of continuing to lower it. I would guess it was one of the switches telling it the top was not up but it does the same thing when I lower the top. It puts the top in the trunk. The Pump will not reverse from raising the trunk lid to Pulling it back down.
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#10 Old 02-25-2014
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Originally Posted by dukeoffl View Post
. . . The Pump will not reverse from raising the trunk lid to Pulling it back down.
Sorry to hear that you haven't been able to isolate the problem, I think we're reaching the end of the easy things to check and resolve . . .

You probably realize this, but just in case someone doesn't, the pump doesn't (shouldn't) reverse direction. A solenoid inside the block shifts a valve to reverse the direction of the fluid flow. There is a possibility that a valve is stuck; due to debris, or that the solenoid isn't other wise able to move it. It might be something I would try fixing, but it would take an evening and I'd have parts spread out all over my kitchen table. (If it's a sealed unit, I think I'd raise the white flag.) Cleaning would be relatively easy, (just make sure all the parts go back in in the right direction . . . ) checking the electrical components might take a bit more ingenuity.

My one last question would be if one of the limit switch leads have been swapped? But if you didn't work on them, they should be ok as is. A VOM on the leads at the pump while you trigger the limit switches would eliminate this issue. I'm not sure the system is smart enough to recover from a bad switch (position) signal.

I haven't done this so I'm guessing a bit, if the valves are driven by an electric solenoid, (probable) it might be bad or frozen. If there is debris in the valve/valve body then a disassembly and cleaning would probably resolve it. Valves can typically be 2 position or 3 position, and be driven by one or two solenoids. If it's a single solenoid valve, it might also have a spring return in which case a broken spring might also cause the problems you see.

Sorry I can't be of more help, but I think you've eliminated all the "simple" issues. Professional help or a replacement unit might be needed at this point. If someone could give you a temporary swap, that could prove very helpful. Tophydraulicsinc do say they rebuild pumps; no idea on the cost though.
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#11 Old 03-15-2014
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I believe you were right lilred, I believe it was a stuck valve. I ordered a used one off ebay for $280 and now it is finally working. I purchased the car with the top not working, so this is the first time it has worked for me. Thanks everyone for your help!
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#12 Old 03-15-2014
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