Mercedes-Benz cars made after 2003 use a 7-speed automatic transmission, called 7G-Tronic. The 7-speed transmission offers superb better performance, shorter shift times, and improved fuel economy. Even though the manufacturer may recommend the transmission is sealed for life and doesn't need servicing, transmission fluid and filter changes every 60,000 miles can extend the life of the transmission when properly performed.

In this guide, we go over the steps required to change transmission fluid and filter on the 7-speed transmission. This is a simple job that you can perform in your garage. It requires a few basic tools and a special connector

Parts you will need 

Tools required

  • 722.9 Transmission Fluid Adapter Filler adapter 
  • Fluid transfer pump
  • 6mm Allen key socket
  • 10mm Allen key socket
  • Extension for sockets
  • Universal joint (on some models)
  • Flat screwdriver
  • MB specific scan tool or an IR thermometer
  • Oil drain pan
  • Torque wrench

Before you start

  • Avoid letting fluid get in contact with your skin. Use gloves and safety glasses. 
  • Transmission fluid may be too warm and cause burns. 
  • Secure the vehicle with jack stands in addition to the jacks. 
  • This procedure only replaces the fluid that is in the oil pan which is about 40% of the total capacity of the transmission fluid.  

Procedure

  1. Jack up the vehicle at all four-wheel. The vehicle needs to be level. The easiest way to do this is on a lift. Still, if you don’t have access to it, lift both the front and rear side of the car on jack stands, making sure it is leveled and sits securely.
  2. Depending on the model, you will need to remove the whole splash guard or just the rear section. You will need an 8mm socket to remove the screws that hold the splash guard. SPLASH GUARD

     

  3. Place an oil pad directly under the drain plug located at the bottom of the transmission pan. Using a 6mm Allen key, loosen the drain plug that is located at the bottom of the transmission pan. drain mercedes 722.9 transmission fluid

     

  4. Only one portion of oil will flow out, as there is an overflow pipe above the drain hole. After the oil stops flowing out, use a suitable flathead screwdriver to push the overflow pipe up, which will allow the rest of the oil to drain out. oil drain bolt 722.9 transmission

     

  5. Locate and remove eight bolts that hold the transmission pan in place. For this, you will need a 10mm Allen key socket and a suitable extension. Carefully lower the transmission pan and move it out of the way. A small amount of oil remains in the oil pan so be careful as you lower the oil pan. Don't tip the pan to the side. oil pan bolts

     

  6. Carefully pull down and remove the filter, which is integrated into a metal housing. You may need to wiggle until it comes free. The oil filter simply snaps in place. 
  7. On the transmission pan, remove the old gasket and the overflow pipe. Locate and remove two disc-shaped magnets. Thoroughly clean both magnets and the pan itself, ensuring there are no metal shavings. Install a new washer on the drain plug.
  8. Refit magnets and overflow pipe at their previous locations and install a new pan gasket. While fitting the gasket, make sure it sits properly. 
  9. Install the new oil filter by carefully pushing it into the hole on the control-valve body. Using a brake cleaner and rugs, clean the mating surface at the gearbox housing.
  10. Raise the transmission pan in its location and bolt it down. Use a torque wrench to tighten the bolts to 3 lb-ft. 
  11. Fill the transfer pump with 5 liters of gearbox oil and build up the pressure. If you are using an electric pump, connect the pump to a 12-volt power source and insert the pickup tube in a fluid container that's full. 
  12. Place the filler adapter into the drain plug, connect the pump hose on it, and open the valve. Let the pump do its work until 5 quarts are in and then close the valve. 
  13. Setting the correct level requires the gearbox oil to be at 45 °C, turn on the engine, and leave it running until the gearbox oil temperature reaches this value. You will need either a specific scan tool that can access these values, or use an IR thermometer the temperature on the gearbox housing. 
  14. With transmission temperature at 45 °C, push the gearbox lever through P-R-D and back several times. 
  15. Go back underneath the car, disconnect the filler adapter allow excess fluid to drain until only a small amount still drains out. If there is no transmission fluid draining out add more fluid and repeat the process as needed.
  16. Whit drainage almost over, quickly reinstall the transmission drain plug and tighten it to 17 lb-ft using a torque wrench and reinstall all remaining parts.

Where is the dipstick to measure the transmission fluid level? 

The 7-Speed 722.9 transmission has no dipstick tube or dipstick. The fluid level is checked using the overflow method via the oil drain bolt hole. Always check the transmission fluid at the recommended temperature for the transmission fluid. 

Applications

Applications of the 7-speed automatic transmission include:

  • 2007-2010 Mercedes-Benz CLK 63 AMG Coupé
  • 2005-2007 Mercedes-Benz SLK 280 Roadster
  • 2005-2007 Mercedes-Benz SLK 350 Roadster
  • 2005-2007 Mercedes-Benz SLK 55 AMG Roadster
  • 2005-2007 Mercedes-Benz SLK 55 AMG Black Series Roadster
  • 2012-2015 Mercedes-Benz SLK 200 Roadster
  • 2012-2015 Mercedes-Benz SLK 250 Roadster
  • 2012-2015 Mercedes-Benz SLK 250 CDI Roadster
  • 2012-2015 Mercedes-Benz SLK 350 Roadster
  • 2012-2015 Mercedes-Benz SLK 55 AMG Roadster
  • 2003-2006 Mercedes-Benz SL 500 Roadster
  • 2006-2008 Mercedes-Benz SL 350 Roadster
  • 2006-2008 Mercedes-Benz SL 550 Roadster
  • 2008-2009 Mercedes-Benz SL 280 Roadster
  • 2008-2011 Mercedes-Benz SL 350 Roadster
  • 2008-2011 Mercedes-Benz SL 550 Roadster
  • 2008-2011 Mercedes-Benz SL 63 AMG Roadster
  • 2009-2011 Mercedes-Benz SL 300 Roadster
  • 2012-2014 Mercedes-Benz SL 350 Roadster
  • 2012-2015 Mercedes-Benz SL 400 Roadster
  • 2012-2015 Mercedes-Benz SL 500 Roadster
  • 2012-2014 Mercedes-Benz SL 63 AMG Roadster
  • 2012-2018 Mercedes-Benz SL 65 AMG Roadster
  • 2016-present Mercedes-Benz SL 400 Roadster
  • 2016-present Mercedes-Benz SL 500 Roadster
  • 2006-2010 Mercedes-Benz R 320 CDI 4MATIC LWB
  • 2006-2010 Mercedes-Benz R 350 4MATIC LWB
  • 2006-2007 Mercedes-Benz R 500 4MATIC LWB
  • 2007 Mercedes-Benz R 63 AMG 4MATIC LWB
  • 2008-2010 Mercedes-Benz R 280 LWB
  • 2008-2010 Mercedes-Benz R 280 CDI LWB
  • 2008-2010 Mercedes-Benz R 350 LWB
  • 2008-2010 Mercedes-Benz R 500 4MATIC LWB
  • 2005-2008 Mercedes-Benz ML 280 CDI 4MATIC SUV
  • 2005-2008 Mercedes-Benz ML 320 CDI 4MATIC SUV
  • 2005-2008 Mercedes-Benz ML 350 4MATIC SUV
  • 2005-2007 Mercedes-Benz ML 500 4MATIC SUV
  • 2006-2008 Mercedes-Benz ML 420 CDI 4MATIC SUV
  • 2006-2008 Mercedes-Benz ML 63 AMG 4MATIC SUV
  • 2008 Mercedes-Benz ML 500 4MATIC SUV
  • 2005-2007 Mercedes-Benz C 320 CDI Sedan
  • 2006-2007 Mercedes-Benz C 230 Sedan
  • 2006-2007 Mercedes-Benz C 280 Sedan
  • 2006-2007 Mercedes-Benz C 350 Sedan
  • 2004-2006 Mercedes-Benz CLS 350 4-Door Coupé
  • 2004-2006 Mercedes-Benz CLS 500 4-Door Coupé
  • 2005-2006 Mercedes-Benz CLS 320 CDI 4-Door Coupé
  • 2006-2010 Mercedes-Benz CLS 320 CDI 4-Door Coupé
  • 2006-2010 Mercedes-Benz CLS 350 4-Door Coupé
  • 2006-2010 Mercedes-Benz CLS 350 CGI 4-Door Coupé
  • 2006-2010 Mercedes-Benz CLS 500 4-Door Coupé
  • 2006-2010 Mercedes-Benz CLS 63 AMG 4-Door Coupé
  • 2007-2010 Mercedes-Benz CLS 63 AMG Black Series 4-Door Coupé
  • 2006-2010 Mercedes-Benz R 280 CDI 4MATIC Sedan
  • 2006-2010 Mercedes-Benz R 320 CDI 4MATIC Sedan
  • 2006-2010 Mercedes-Benz R 350 4MATIC Sedan
  • 2006-2007 Mercedes-Benz R 500 4MATIC Sedan
  • 2007 Mercedes-Benz R 63 AMG 4MATIC Sedan
  • 2008-2010 Mercedes-Benz R 280 Sedan
  • 2008-2010 Mercedes-Benz R 280 CDI Sedan
  • 2008-2010 Mercedes-Benz R 350 Sedan
  • 2008-2010 Mercedes-Benz R 500 4MATIC Sedan
  • 2006-2009 Mercedes-Benz GL 320 CDI 4MATIC SUV
  • 2006-2009 Mercedes-Benz GL 420 CDI 4MATIC SUV
  • 2006-2009 Mercedes-Benz GL 450 4MATIC SUV
  • 2006-2009 Mercedes-Benz GL 500 4MATIC SUV

There may be other applicaitons of this transmisison not included in this list. 

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