How to replace Mercedes-Benz convertible pump

In this step-by-step guide, you will find instructions on how to replace the convertible pump on Mercedes-Benz soft-top and hard-top convertibles such as CLK, SLK, SL, E Class convertible, etc. 

Symptoms

Common symptoms indicating the convertible pump needs to be replaced: 

  • Convertible pump won't run
  • Convertible fuse keeps blowing
  • Convertible relay burned up
  • A leak from the convertible fluid reservoir or motor

What you will need

Instruction

  1. Open the trunk and locate the convertible pump on the left side of the trunk. mercedes convertible top pump location

     

  2. Remove the plastic retainer screws. They simmply pop out. Remove the panel. mercedes convertible pump removal

     

  3. Remove the tonneau cylinder locking pins. Remove the retainer from the lower pin with a flathead screwdrivermercedes convertible top cylinder

     

  4. Remove the upper pin and disconnect the cylinder. You don't need to completely remove the cylinder.mercedes convertible top cylinder removalSimply move it to the side to make room to pull out the convertible top pump. 
  5. Remove the 10mm nut that secures the pump to the frame. convertible pump bracket to frame

     

  6. Remove the 10mm nut for the ground wire. It is located right behind the hydraulic lines. Disconnect the wire. convertible pump ground

     

  7. Lift up the cover from the positive junction box.mercedes convertible pump motor clk slk sl positive lineRemove the 10mm bolt and disconnect the positive cable. 
  8. Unplug the electrical connector. Squeeze the connect then pull it to disconnect it from the pump. mercedes convertible hydraulic pump connector

     

  9. Remove the three bolts on top of the plate with the hydraulic lines. This is also known as the manifold plate. mercedes convertible pump line

     

  10. Pull up the manifold plate then pull the hydraulic lines out one by one until all of them are removed. disconnect convertible line

    Hydraulic lines completely disconnected. 

    mercedes convertible pump motor with lines removed
  11. Remove the hydraulic pump from the vehicle.mercedes convertible pumpConvertible pump removed. convertible pump

     

  12. Install the new convertible pump in reverse order. Connect the electrical connector, negative and positive wires. install new mercedes  clk convertible pump

     

  13. Connect all the hydraulic lines and tighten the three aluminum bolts. Don't overtighten the bolts. These are aluminum bolts and can easily strip. It is not the pressure from the plate that prevents fluid leaks. It is the O rings that are present at the tip of each line. install mercedes convertible top

     

  14. Remove the brass bolt on the side of the reservoir and use a syringe to fill up the reservoir. Once the reservoir is full, fluid will start to come out of the fill hole. All the lines should be connected at this point. ADD COVERTIBLE TOP FLUID

     

  15. Reinstall and tighten the brass bolt by hand. Operate the convertible top two to three times. 
  16. Recheck the convertible top fluid level by looking at the side of the translucent reservoir. Add convertible top fluid as needed. The level will drop as you operate the top a couple of times. After a couple of top open/close operations, the air should be removed from the cylinders at which point you shouldn't be losing any more fluid unless there is a leak present. 

FAQ

Do I need to bleed the lines? 

You do not need to bleed the air from the cylinders or lines. The system will return the air back to the reservoir as you cycle the convertible top a few times. Top off the convertible top fluid level and add more fluid if the level drops below the min level. 

 

By YOUCANIC on Aug 15, 2019

Vehicle

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