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Convertible Vario Top Hydraulic Pump Unit Service
 
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Pelican Technical Article:

Convertible Vario Top Hydraulic Pump Unit Service

Tom Morr

Time:

1 hour1 hr

Tab:

$11 (fluid), $5-$9 (relay), $58 (switch)

Talent:

***

Tools:

T30 Torx bit, 5mm hex/Allen wrench/bit

Applicable Models:

Mercedes-Benz R170 (1998-04)

Parts Required:

New relay

Hot Tip:

Lube hinges while checking the hydraulic pump

Performance Gain:

Top will hopefully work properly

Complementary Modification:

Check the limit switches on the right-rear side

The SLK's electro-hydraulic Vario convertible hard top is its marquee feature. It's also one of the car's most problematic systems. Five hydraulic cylinders, nine limit switches, a control switch, four window motors, a pump, two solenoids, a relay, cables/pulleys, and a control module all have to work in sync for the top to operate properly. If one link in the chain breaks down, the top either won't work or it stops mid-retraction.

For the average SLK owner, top troubleshooting is possibly better left to the pros. The Vario Roof Diagnostic Aid manual is detailed and extensive.

However, the average owner can separate the more-obvious problems from the complicated ones. It might save a trip to the dealership or shop.

First, make sure that the car's battery is fully charged before attempting top troubleshooting. If the battery reads at least 11.4 volts with the engine off and its cables are clean and clamped snugly on its terminals, then focus on the top's switch. If nothing happens when the switch is pulled and the switch doesn't illuminate, then it or its connections could be bad. Remove the rear center console (please refer to that article) to access the switch.

Next, focus on the hydraulic pump unit's relay. Have an assistant pull the switch; feel the relay and listen for it to click when the switch is depressed. If it doesn't click, pull the relay and use a test light or a multi-meter to verify that power is being sent to the relay. If not, the switch or wiring between the switch and relay could be the problem.

If power is going to the relay but it isn't clicking, either test or replace the relay (Pelican #002-542-74-19-M44). Relays are affordable, and having a spare is a good idea.

But even when the relay does click, sometimes it isn't making sufficient contact for full voltage to be sent to the hydraulic unit. Please see the article on relay testing for additional details. Simply replacing the relay sometimes solves the problem.

If the top works but is getting progressively slower, check the fluid level in the hydraulic pump. The fluid line should be visible through the access door on the trunk's right rear side. If it's low, add approved hydraulic fluid (#000-989-91-03-10-M36 for a liter bottle) until the level is in the acceptable range.

Greasing the hinges with spray lube and applying dressing to the weatherstripping will also help keep the Vario system in tip-top operating condition.

If top problems still remain, please refer to accompanying how-to articles for further information on switches, hydraulic cylinders, and cable/pulley operation. Most of those parts can be repaired somewhat affordably. Unfortunately, new hydraulic pumps are expensive. Hopefully that isn't your problem.

The trunk cover blind switch on the right side panel needs to be triggered if the cover is retracted or removed.
Figure 1

The trunk cover blind switch on the right side panel needs to be triggered if the cover is retracted or removed. A zip-tie can be used to actuate the switch. (We removed the entire side panel for clarity. Please see that how-to article for details.)

Listen and feel the hydraulic pump's relay (arrow) for a click when the top's switch is pulled.
Figure 2

Listen and feel the hydraulic pump's relay (arrow) for a click when the top's switch is pulled. The relay is accessible through the removable door in the trunk's right-side cover panel.

Even if the relay sounds and feels like it's clicking, the contacts can wear out.
Figure 3

Even if the relay sounds and feels like it's clicking, the contacts can wear out. If the hydraulic pump isn't getting full power, it won't work properly. Replacing the relay is sometimes a quick, affordable fix.

A test light or multi-meter can verify if the console switch is sending power to the relay.
Figure 4

A test light or multi-meter can verify if the console switch is sending power to the relay.

Verify that the pump's hydraulic fluid is at the proper level, as indicated by the lines on the reservoir (arrows).
Figure 5

Verify that the pump's hydraulic fluid is at the proper level, as indicated by the lines on the reservoir (arrows).

If the fluid is low, the fill hole is on top of the hydraulic pump.
Figure 6

If the fluid is low, the fill hole is on top of the hydraulic pump. The plug is easier to access by removing the metal cover, which is secured by four bolts having T30 Torx heads (arrows).

The filler hole (arrow) is on top of the pump, on the right-rear fender side.
Figure 7

The filler hole (arrow) is on top of the pump, on the right-rear fender side.

Use a 5mm Allen/hex wrench or bit to remove the filler plug.
Figure 8

Use a 5mm Allen/hex wrench or bit to remove the filler plug.

To avoid spills, transfer the hydraulic fluid to a large syringe or other suitable bottle.
Figure 9

To avoid spills, transfer the hydraulic fluid to a large syringe or other suitable bottle. We cleaned out a hydraulic jack fluid bottle and used a few inches of plastic tubing to top off the fluid without making a mess.

If the fluid is low, check for any obvious leaks on the pump and hydraulic cylinders (arrow).
Figure 10

If the fluid is low, check for any obvious leaks on the pump and hydraulic cylinders (arrow). Each corner of the trunk has a cylinder; a fifth one is above the headliner.

Regularly lubing all pivot points on the roof and trunk hinges and well as the windshield latches improves performance.
Figure 11

Regularly lubing all pivot points on the roof and trunk hinges and well as the windshield latches improves performance. White lithium grease is probably best (and messiest); silicone spray works, too.

Regular applications of weatherstrip dressing improves top and trunk sealing, operation, and quietness.
Figure 12

Regular applications of weatherstrip dressing improves top and trunk sealing, operation, and quietness. Krytox is one popular but expensive product. More affordable possibilities available from Pelican Parts include Gummi Pfledge (#IZ-914806). Silicone spray works, too, and most car-care product lines include some type of silicone-based rubber protectant that'll help preserve weatherstripping.

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Comments and Suggestions:
Junior Jesus Comments: My 2001 SLK 320 roof leaks oil and now fluid bottle is empty but roof completely open and won't close- where do I fill up hydraulic fluid and may I use any hydraulic fluid in absence of recommended fluid from dealership here????
November 30, 2016
  Followup from the Pelican Staff: You fill at the pump reservoir. Check your owners manual for the location. You have to use the right fluid. - Nick at Pelican Parts  
taguato1 Comments: Any one has had the problem of the hard top slamming shut? I Just recently started having that problem. Someone told me that it might be due to having air in the hydraulics?
November 17, 2016
  Followup from the Pelican Staff: Air is the likely cause. Check the fluid level and top up if needed. - Nick at Pelican Parts  
illiterate Comments: Please help, I am based in dubai. My 1998 slk230 roof use to work good but sometimes I would have to replace the a fuse among the 3 in the trunk. Recently I pressed the roof to open, the trunk opened but the top passenger side seem stuck but driver side released but cant open. I discovered oil in the pump was low but that was after someone removed one of the hydraulic lines so we could manually push to close the trunk. Now i am having a leak on the point of contact between line and cylinder what can I do?
October 16, 2016
  Followup from the Pelican Staff: Are you trying to repair only the leak now Is everything else working? - Nick at Pelican Parts  
Mitch Comments: MBB 2001 320 SLK
Changed battery in the keys
Would not work alarm went off
Switch for top not working no light
I can't figure what has happened what relay switches need to be checked? Like relay on pump top?
I did take the fide out for the alarm as every time I opened door it would sound off.
Also when doors are open the hazardous light go on for a period of time?
Please assist. Many thanks! Mitch
September 17, 2016
  Followup from the Pelican Staff: Could be a fuse or module issue. I would start by checking the vehicle for fault codes. If multiple systems are not working properly, fault codes will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
scott Comments: Hi I have a 2001 230slk I replaced cylinder on roof and filled pump up with fluid , now when I raise roof it over shoots the locking pins any idea what's wrong appears to be out of line.
September 14, 2016
  Followup from the Pelican Staff: I can't see how filling the fluid would cause the top movement to change.

Usually when this happens it needs to be adjusted. Shouldn't be the case for your vehicle unless something was replaced or removed. - Nick at Pelican Parts
 
scott Comments: How do I check fault code on 2001 slk230 roof not working when I use switch cant hear a noise at all noticed fluid was low and replaced cylinder in roof .
September 10, 2016
  Followup from the Pelican Staff: You will need a scan tool capable of reading fault from the entire vehicle. Something like an Autologic. - Nick at Pelican Parts  
Briley Comments: I have a 1998 slk 230, I recently bought the car and was told the pump was bad, when I clicked the button it lowered the back windows, I then manually put the top down but couldn't get the trunk to latch up front, I put the top back up and latched it up top but now the Windows won't even go up, I bought a new pump and installed it but still have nothing, I think the 2 trunk release cables are stuck or broke because it still will not shut, and ideas on something I can try before I spend an arm and leg taking it to the dealership? Thanks
September 7, 2016
  Followup from the Pelican Staff: If the windows won't move, it is likely due to a position switch in the wrong state or a stored fault. You will need to read the fault codes to start. Maybe let a shop do that for you.- Nick at Pelican Parts  
Mark Comments: I have a 2001 Mercedes SLK230 and when I try to put the top down it blows a fuse. I went through 4 of the 40 amp fuses just trying to put the top back up. Would that be a control module? Thanks in advance for any help you can provide.
September 2, 2016
  Followup from the Pelican Staff: More likely a drive unit or pump. I would grab a wiring diagram and review what the fuse powers, then check if the harness or component is causing the short.- Nick at Pelican Parts  
MartinJsy Comments: On my 2000 SLK 230, when the hood goes up, and after the windows are up etc, there is still a wirring noise from the boot that continues all the time . No Noise when hood is fully down
Sounds like the hydraulic pump is not "being told to switch off " ? a Will it damage anything to driv with the wirring noise ?, 2 Likely cause ? Sensor ? and where ? Thanks Martin
August 16, 2016
  Followup from the Pelican Staff: The latch switches may not be in the right position. Use a scan tool to check the position switches when closed. Look for something reading open that should be closed. You can try to manually close the open switch to confirm the whirring noise goes away. - Nick at Pelican Parts  
Larry Comments: I have a 1999 Slk230 Compressor that some of the hydraulic lines blew out of the pump and it stopped working. What could have caused that and do you have a diagram of where the blown out hydraulic lines are supposed to go. I am replacing the pump
August 15, 2016
  Followup from the Pelican Staff: I don't have a diagram for that. Sounds like you had an over-pressure issue. Give our parts specialists a call at 1-888-280-7799. Give them the year and model of your vehicle and ask them to email you the relevant pages from the parts book. - Nick at Pelican Parts  
Alfredo 320 slk Comments: Hello need help with my slk 320 2003 the the switch to open the top of the convertible does not work it does not light up when I started the car it does not blink couple time I try to open the top nothing happens I check the relay i even put a newcone and check all the fuses ,, any idea why the swith to open the top does no turn on and light up and works ??,, please advise help !!!!!!
August 11, 2016
  Followup from the Pelican Staff: The system may have a stored fault not allowing it to function. I would start by checking the vehicle for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
Skip Comments: I put the top down w/o a problem. When raising it, it could not get over the hump so I lowered it. Then, I decided to close it manually and pulled the two release cables But, when I next checked the fluid level I saw that it was low. After filling it, the control light blinked rapidly and it produced no action. I suspect that the cable release must be re-engaged. How do I do it?
August 9, 2016
  Followup from the Pelican Staff: You didn't mention what vehicle you are working on. I may be able to help if you give me that info. - Nick at Pelican Parts  
buck Comments: So if i go thru manual release procedures to put it down i can t reset and
Put it back up if needed. Didn t have trouble going up.
August 5, 2016
  Followup from the Pelican Staff: You are better off using manual all the time if one movement is faulty. - Nick at Pelican Parts  
Buck Comments: Slk 230 top not working, don t hear motor and nothing.
If i manual release top, which i think i can do. I hope and assume that maybe it will run pump to close top.
When i can check latches, inspect, grease hinges.
I m hoping this works
August 1, 2016
  Followup from the Pelican Staff: The motor will not run with the top released. Check the procedure, you may have to manually crank it closed. - Nick at Pelican Parts  
Nate Comments: I have a 2000 slk230 whose top needed more and more help until it wouldn't work at all. Pump runs, Fluid is full and manual valve is closed. Is there a pump rebuild kit available? Is there a way to test the pump at home?
July 20, 2016
  Followup from the Pelican Staff: No way to bench test it that I know of, same goes for the rebuild kit.

Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Ravi Comments: I have a 2002 SLK. Noticed after 30 days of liited use that the fabric on the hard top has balloned to the extent that it touches my head while driving. How do I resolve it ?
July 19, 2016
  Followup from the Pelican Staff: You will have to replace the headliner. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Matti from Finland Comments: Problem solved! A friend came over and we investigated the clunking sound while opening and closing the roof and located the clunk to the bottom of the left hydrolic piston which raises the trunk. Upon inspection we found an old tailight socket wedged underneath and upon removal, no more clunk!!!
July 11, 2016
  Followup from the Pelican Staff: Thanks for sharing your experience. These type of comments add so much to the Pelican tech community.
- Nick at Pelican Parts
 
Matti from Finland Comments: Hello! I don't know if I have a problem. My roof works fine but when the rear hood closes, a few centimeters before it closes there is clunk sound from the left side I think. It didn't do this before. From your great advice, I removed all the interior panels and visually there is nothing loose or leaking. I siliconed and lubed and no help. Do you have any tips? Thanks for your help and advice I couldn't have taken the inside out without your guides!
July 11, 2016
  Followup from the Pelican Staff: Here is your repair info:

Upon inspection we found an old tailight socket wedged underneath and upon removal, no more clunk!!! - Nick at Pelican Parts
 
Red Comments: 1999 slk 230 original owner, 46K miles. Suddenly the fabric on interior roof has expanded away from the ceiling - like a balloon. What happened? And what do I do to fix it?
July 7, 2016
  Followup from the Pelican Staff: Could be from age or moisture. You wil have to replace the headliner.

- Nick at Pelican Parts
 
Buck Comments: Not hearing a motor run when trying to put top down. Light blinks slowly. You should hear a motor even if it locked at head liner
July 6, 2016
  Followup from the Pelican Staff: The motor should run once the top latches unlock. - Nick at Pelican Parts  
Vy Nguyen Comments: My car 1999 slk1999 convertible top slowly dropped in the trunk. The light stay on & trunk is not close. How can i reset it? what's wrong? Please advise.

Thanks.
July 2, 2016
  Followup from the Pelican Staff: Could be a fluid issue or a fault code. I would start by checking the vehicle for fault codes using a Mercedes-benz scan tool. - Nick at Pelican Parts  
Clete Comments: Good morning, I think from reading all issues I have fault codes issues. Switch inside car flashes but nothing happens.I have replaced the two hydraulic cylinders in the trunk. Put everything back to original way it was.
June 8, 2016
  Followup from the Pelican Staff: Yes. You will need to read the fault codes to see what part may be the cause. - Nick at Pelican Parts  
joseph Comments: bought the car recently like 2 month ago the roof worked fine in opening and closing but then when i opened the roof it wasnt as powerful as before i tried closing it but it closed from the driver side only i checked the pump and found an oily mess with the hydrolic fluid down but i couldnt locate the leak !!
June 1, 2016
  Followup from the Pelican Staff: Clean the oil from the pump, then top it up. Run the top for a few days, then recheck the pump for leaks. Look for clean oil, that will be the leak. - Nick at Pelican Parts  
duke Comments: just had the convertible pump replaced on my 99 slk230. seems to work fine until when I press the button to put the top up halfway the top free falls closed with a big bang.What should be done?

















i
May 25, 2016
  Followup from the Pelican Staff: There may be a fluid or pressure issue. I would check if the pressure relief (emergency closing) screw is in the right position. Also check fluid level. - Nick at Pelican Parts  
Carlos Comments: Hi Nick. After driving my '01 SLK320 one rainy day, I noticed the next day in my garage where car was parked, an oily mess that ran the sides of vehicle. Coincidentally next time I tried to lower the top it wouldn't work at its normal speed and couldn't even lower it all the way. I went ahead and closed it back manually. Since then I don't even get any sounds when activating switch nor a light on switch. BTW, the hydraulic reservoir is empty. Where should I start? Thanks
May 5, 2016
  Followup from the Pelican Staff: The reservoir is empty, i would top it up. be sure to fill it via the instructions in a MB repair manual. - Nick at Pelican Parts  
marixo Comments: Can you please tell me how to remove the cylinder lines from the hydraulic pump. These lines have the 90degreee bend in metal inserted into the pump. I see there are several torx plugs but I do not know if they have relevance to this or not.
May 5, 2016
  Followup from the Pelican Staff: What vehicle are you working on? can you share a photo of the line? - Nick at Pelican Parts  
Tim Comments: Hi, I have a 2004 SL600, my pump failed during a cycle. I manually had it closed by a mechanic. I then ordered a new pump and changed it. I can hear it run but it's like the top is stuck or locked? Can you manually lock the roof or pump? Additional information while I was waiting on the pump the safety roll bar got deployed during driving for safety. I can't get that down as well, it moves shortly but back to possition also like it's locked?

I hope you can help
May 2, 2016
  Followup from the Pelican Staff: The pump may have an emergency raising pressure relief screw / valve, if released, the pump will run and the top will not move. - Nick at Pelican Parts  
Mari Comments: 2005 350 slk vario roof leaking fluid and will not open/close. hydraulic pump is behind seats and under retractable roof area - can not get to from trunk and have to remove center console to remove metal behind carpet behind seats. How do you remove center console?
April 24, 2016
  Followup from the Pelican Staff: We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Jay Comments: Hi, I have a 2004 SLK 320 that I just rebuilt the top roof latch cylinder. After reassembling everything I tried to open or close the top, nothing happened. I had someone in the car and try the switch and nothing from the relay. I am buying a relay and will try again. Is there something I might have overlooked?
April 15, 2016
  Followup from the Pelican Staff: Was everything working before your rebuild? Maybe a position switch is out of sync. - Nick at Pelican Parts  
wolf Comments:

dear rick
the rear windows only move in association with the roof functions, even though they are not controlled hydraulically, they will not work properly if the roof does not. they receive commands based on what the roof is doing. so if one of the roof sensors, ex the three in the forward roof/windshield attachment area, are misaligned or bad,there will be a problem. also where the roof folds the wires tend to go bad.
April 8, 2016
  Followup from the Pelican Staff: Thanks for the input on this one. We appreciate the help.
- Nick at Pelican Parts
 
Bill Comments: Good afternoon! I am dealing with the following problem and i would be grateful if you could help me: there was a leak from the cylinder that secures the hard top.after i had it fixed by changing the sealing materials, while i can hear the pum function and it unlocks the roof it doesn't go further to open the roof or the trank. the oil level is ok.in addition while in the beginning it seems to properly function,after a few seconds, it sounds like working without any resistance. Looking forward to your reply,thank you in advance.
April 3, 2016
  Followup from the Pelican Staff: Sounds like air is trapped in the system. You may have to operate it a few times to bleed the air. - Nick at Pelican Parts  
Wayne Comments: Hi Nick, I replaced the top lock cylinder but when I was putting the hydraulic lines 31 and 33 into the pump 2 other lines 42 and 22 came out and I am not sure into which holes they go. I tried to read the positions from the pictures and I think that I found those 2 but is there a picture or schematic that has the positions labeled that you might share with us. If someone was to replace a pump motor they would need that info. Thanks
March 27, 2016
  Followup from the Pelican Staff: let me see if I can have the info added. See attached photo. - Nick at Pelican Parts
Goof G Comments: There are flaps on either side of the deck lid below the rear window of a 1999 230 SLK. When the retractable roof is engaged these flaps are not coming up fully which interferes with the roof folding back into the trunk. The flaps are actuated by braided wire mechanism. The wire seems to be stretched out. My problem is that I do not know what to call these things or know a part # to try and order replacements. Please help indentify this part.
March 24, 2016
  Followup from the Pelican Staff: I’m not the best with part numbers.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Help Comments: The motor will change tones, to me it seems like the top is not unlocking for the trunk to open? The pump holds full pressure and is not leaking. I've taken to repair shop and they can't get a code to pull up due to there being a fault in the CAN sensor not communicating.
March 23, 2016
  Followup from the Pelican Staff: Well I would start with the communication error. If the system can't communicate or the bus is shorted, the top may not function. - Nick at Pelican Parts  
wicks Comments: how can i close it manual cause i can find the problem its opened half way
March 15, 2016
  Followup from the Pelican Staff: There should be an emergency closing procedure in your owner's manual. - Nick at Pelican Parts  
Help Comments: I have replaced the hydraulic cylinder that was leaking. I still cannot get the trunk to open so the top can fold down when I press the switch. However it will close if I manually pull the trunk up and then close it with the switch. Does this mean I may need a new hydraulic pump?
March 13, 2016
  Followup from the Pelican Staff: Might be, does the pump run? How does it sound? for example, does it sound like it is free-wheeleing, or does the tone change? - Nick at Pelican Parts  
Sophia Comments: Fluid level is okay, I'm wondering if there's something I need to do to put take it out of manual mode. Thanks!
February 29, 2016
  Followup from the Pelican Staff: I am not 100% sure. I would grab a repair manual. It will have the procedure.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
yvon Comments: hy!i would like to now where is the system to take codes erreur for mercedes slk 230 1998 i have one Under the dash driver side is theres another for the top?Thank you for your help!
February 22, 2016
  Followup from the Pelican Staff: I don't understand the questions. Can you describe what you are trying to fix? - Nick at Pelican Parts  
Sophia Comments: I recently purchased a 2001 slk230...the top will not go down. The Windows go down but the trunk will not engage and top will not go down. I can hear the pump and have replaced the relay...any other suggestions? I have noticed that it looks as if someone has manually put the top back up using the cables in the trunk. Thanks
February 18, 2016
  Followup from the Pelican Staff: have you checked the fluid level? - Nick at Pelican Parts  
Pete Comments: Hi Nick, Any scan tool you can recommend? Any economical one? Thanks.
February 15, 2016
  Followup from the Pelican Staff: Escan may do it. Not sure of any economical models that access full-vehicle control modules. - Nick at Pelican Parts  
Pete Comments: My 2004 SLK 230 was bumped in behind. Bumper isn't damaged. Trunk lid was deformed a little.
The roof was closed during the accident. The trunk can close and lock after the accident.
Then I tried to open the roof. The window rolled down, the trunk lid raised an inch and stop. I can close the lid back. Then the trunk cannot be locked afterward without a push in the lock area. After a while it can lock normally.

What should I check further? Thanks.
February 14, 2016
  Followup from the Pelican Staff: I would assume one of the position switches are out of sync due to the impact. You will need a scan tool to check function, fault codes and position. - Nick at Pelican Parts  
chelo Comments: the trunk was not damaged.
February 8, 2016
  Followup from the Pelican Staff: Then it may be fine. - Nick at Pelican Parts  
chelo Comments: what are the causes of hydraulic cylinder will be damage? my 1997 mercedes benz slk230 was bumped by a 6 wheelers truck and the damaged of the bumper was minimal. Is it possible that it will cause the damage of the hydraulic cylinder?
February 3, 2016
  Followup from the Pelican Staff: If the trunk was damaged, it is possible. Have the top and components inspected. - Nick at Pelican Parts  
BOB Comments: Hi Do you have a flow chart for the operating sequence for the roof on a 320slk
January 29, 2016
  Followup from the Pelican Staff: No I do not. - Nick at Pelican Parts  
Has Comments: Where i can check the module/ switch position?
January 29, 2016
  Followup from the Pelican Staff: Using a Mercedes-Benz scan tool. - Nick at Pelican Parts  
Has Comments: Hello, i want to ask you mr nick, about my slk230 top convertible, what the problem if i open the top work better, but when i want to close the top it not working. Only open the top is work. What the problem?
January 28, 2016
  Followup from the Pelican Staff: Likely a window or position switch is in the wrong state. Check the top module for fault codes and switch position. - Nick at Pelican Parts  
Dannychh Comments: I did step by step and it seems like it's leaking from the cylinder that locks the top. Who do I do?
October 17, 2015
  Followup from the Pelican Staff: Replace the cylinder or line that is leaking. - Nick at Pelican Parts  
Jack Comments: Hey Nick, I'm in the process of replacing my front top lock hydraulic cylinder on my 1999 SLK230 Mercedes, and need to disable and remove the two hydraulic fluid lines from the pump. So, which two on the pump are for the front top lock cylinder? They're not labeled as far as I can tell.
October 11, 2015
  Followup from the Pelican Staff: Lines labeled 43 and 44. - Nick at Pelican Parts  
SKIP Comments: slk230 2003 I disconnecter the battery and reset the code and the top works but the two hooks connected to the roof will not open th allow roof to seat on the algnment pins.The cylinder I replaced is connected to the hooks can it go in backward?
September 14, 2015
  Followup from the Pelican Staff: It has to be installed in the correct direction. Piston shaft faces the top. - Nick at Pelican Parts  
SKIP Comments: 2003 SLK230 I REPLACED TOP CYLINDER AND REFILLED HYDRAULIC FLUID BUT I'M GET A FLASHING LIGHT NO POWER TO THE PUMP.
September 8, 2015
  Followup from the Pelican Staff: Check the vehicle for fault codes. You may have set one during the repair that needs to be cleared. - Nick at Pelican Parts  
Skip Comments: replace roof cylinder and refilled pump is there a procedure to get fuild to the cylinders
September 4, 2015
  Followup from the Pelican Staff: You didn't mention what vehicle. It may be self-bleeding. Just run the top. - Nick at Pelican Parts  
Chuck Comments: My vario roof in 2001 slk 320 started getting slower. And sometimes I had to give it a boost. Now when I press button the pump just had hums. Could it possibly be the pump itself. I have ordered a used working one of eBay. It doesn't look to hard to replace. I just had all cylinders replaced earlier this year.
September 2, 2015
  Followup from the Pelican Staff: Start by checking the fluid level. May be low or a leak. - Nick at Pelican Parts  
Terri Comments: Replaced all 5 rams for roof slk 200 but now when I lower the roof all seems fine except the boot will not close. Checked the switch Om the right boot ram with multi meter and appears to be working
August 17, 2015
  Followup from the Pelican Staff: The windshield latch switches may not be in the right position. - Nick at Pelican Parts  
Daniel M Comments: I got the exact same problem as "TINO" - I would very happy to know the problem as well.
July 23, 2015
  Followup from the Pelican Staff: My response.
Check if the connector to the switch is worn. Inspect the terminals, if ok, I would run new wires to the module. The new wires will either fix the issue, or confirm the control module is faulty (which is unlikely). - Nick at Pelican Parts
 
Tino Comments: 2001 SLK 230, Mercedes dealer couldn't find the problem after checking for fault codes. Convertible top functions fine to bring the windows down and open the trunk. One every 5 attempts it continues the cycle bringing the roof down. I was advised to replace the trunk lid limit switch and I did put a new one but the problem remained. Every time I have to reach this switch and shake the wires to make it work. I am suspecting a bad wire back to the control unit.! What is your advise, and where is the control unit located? Appreciate if you have a picture. Any help will be highly appreciated.
Thanks
July 19, 2015
  Followup from the Pelican Staff: Check if the connector to the switch is worn. Inspect the terminals, if ok, I would run new wires to the module. The new wires will either fix the issue, or confirm the control module is faulty (which is unlikely). - Nick at Pelican Parts  
Tom Comments: 1998 SLK How do you release and remove the hydraulic lines from the roof pump? also what size plugs or caps do I need .
July 12, 2015
  Followup from the Pelican Staff: Remove the center bolt and retaining bracket, then pull the lines out.

There is a plug kit available: 129589009100 Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
DannyT Comments: Need to know the hydraulic pump location for top, SLK350 2006. Some say it is in the trunk and some say it is behind the seat. Could you help
July 6, 2015
  Followup from the Pelican Staff: It is behind the seats. Below the rollover protection bar. behind an insulating panel. - Nick at Pelican Parts  
Kim Comments: I have lost this part.
June 13, 2015
  Followup from the Pelican Staff: If it's available, I am sure we can get it for you.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need. - Nick at Pelican Parts
 
Kim Comments: Hi,
I have a 1998 230 SLK. I have missed the filler plug on the top of hydraulic pump. Can I order it? I attached pic
June 13, 2015
  Followup from the Pelican Staff: If it's available, I am sure we can get it for you.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Wild Bill Comments: Pic.
April 27, 2015
  Followup from the Pelican Staff: Got it, thanks. - Nick at Pelican Parts  
Will Bill Comments: Do you have replacement filler plugs as you call them for a 2004 mercedes sl500 mine are stripped and would like to replace.i believe the. Front one is for filling and the rear is for breathing.I attached pic .the 2 torx bolts.
April 27, 2015
  Followup from the Pelican Staff: We may be bale to get you one.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
rickv0809 Comments: I have a Mercedes Benz SLK 230 2000
Is the rear window connected to the hydraulic system for the convertible? Please get back to me ASAP I need to know because my mechanic fixed the hydraulic motor for the convertible and one of the rear windows because it went down and didnt want to come back up. He then said it was an electrical issue, two days later the window went down and he said that he never did anything to that window but he did! he than said it was not connected to the work he did on the hydraulic for the convertible.
April 7, 2015
  Followup from the Pelican Staff: A rear side window? No, it has a regulator and motor that drives it. I would trust your mechanic and ask him to show you the faulty part. - Nick at Pelican Parts  
mike foster Comments: Is there any hydraulic fluid that can be used to substitute the mercedes brand, as i dont have a dealer close to me.
April 5, 2015
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Mb-SLK320-00 Comments: Hi, my hydraulic fluid has been consummated quiet fast. What can it be ?
March 23, 2015
  Followup from the Pelican Staff: You probably have a leaking piston. - Nick at Pelican Parts  
G Comments: SLK 230 2000 sometimes the roof works and sometimes it doesnt
January 28, 2015
  Followup from the Pelican Staff: Could be many things. I would start by checking the vehicle for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing. - Nick at Pelican Parts  
coonass Comments: Both of my rams at corner of roof are leaking where the ram comes out. Any way thows can be rebuilt or do I have to replace them?
January 18, 2015
  Followup from the Pelican Staff: I think replacement is the only option. - Nick at Pelican Parts  
Nick Comments: Took my 98 slk to a dealer to repair leak at roof latches. Roof works fine but warning buzzer and light come on every 10 miles. Push button for 5 seconds to make pump run, light goes off. Dealer can't find problem. Suspect air in hydraulics. Can you tell me procedure to bleed the system?
January 3, 2015
  Followup from the Pelican Staff: Raise and lower the roof, it should auto-bleed. Top up fluid when complete. Going by memory. - Nick at Pelican Parts  
PeterS Comments: Hi,
I have a 1999 230SLK. Vario roof works OK but a bit slow and sometimes needs a little push up to get it to start opening. When parked for a while in the hot sun, the roof locks will not release. Seems as if the viscosity of the hydraulic may be affected by the heat, or maybe my pump unit has some wear. Appreciate your advice.
Peter S.
Brisbane, Australia
October 30, 2014
  Followup from the Pelican Staff: The pump itself may be failing. If the fluid level is Ok and the top isn't binding, you may need to replace the pump. - Nick at Pelican Parts  
Unfullfilled Comments: The plug on the top seems very hard to remove. I'm afraid I might strip something if I keep going. I'm using the number 5 with the socket wrench. I am to turn left to loosen an right to tighten as usual?
September 20, 2014
  Followup from the Pelican Staff: yes, it is counterclockwise to remove. - Nick at Pelican Parts  
mb-SLK230-99 Comments: Thanks for getting back to me. I agree there is probably a fault. As the article suggest there were options to check before paying the over priced fee for the scan. For instance is there anyway to check the part that the switch plugs into?
September 18, 2014
  Followup from the Pelican Staff: A scan tool is the best way to check the convertible top. You can perform function tests as well as check for fault codes.

You can grab a wiring diagram and do some testing once you determine what part of each circuit does what, but the scan tool is the path of least resistance. - Nick at Pelican Parts
 
mb-SLK230-99 Comments: Also, not hearing any sounds while attempting to operate the convertible top switch.
September 17, 2014
  Followup from the Pelican Staff: Sounds like there is a fault with the top. I would check the vehicle for fault codes. The fault code will direct you to the area of the failure. - Nick at Pelican Parts  
mb-SLK230-99 Comments: Hello, Best article I have seen yet! looking for some further advice. Vehicle's interior got wet while top was down. Closed top then went to open top next day. 1/3 of the way of opening top there was a jerk in the motion so I put the top down with no problem. Next day everything worked except convertible top switch. The convertible top switch light blinks once when starting the car. When pressing the switch forward or backward the light blinks steady but does not operate the windows or roof. All advice will be appreciated
September 17, 2014
  Followup from the Pelican Staff: Sounds like there is a fault with the top. I would check the vehicle for fault codes. The fault code will direct you to the area of the failure. - Nick at Pelican Parts  
John Comments: The trunk cover will open but very small movement from the top and will not lift or close , I have to shut the engine a re-start it again to be able to return to the topless position, can you help
August 25, 2014
  Followup from the Pelican Staff: Is it attempting to move or does it stop with no sound? If there is no sound, I would check the system for fault codes, as one may be set. There could be an electrical problem, causing the top to quit. - Nick at Pelican Parts  

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