Description

Mercedes-benz 722.9 2004 Technical Manual – What You Actually Get

You’ve got a 722.9 transmission on the bench or under a customer’s S430. The fifth generation Mercedes-Benz automatic, seven forward speeds, integrated control module. If you’re working off a third-party scan tool or some forum post, you’re gambling with a $6,000 gearbox. This 2004 Technical Manual from Mercedes-Benz USA is the only document that gives you the factory sequence: torque converter lockup strategy, clutch pack clearances, the exact procedure for flashing the TCM. 79 pages. Not a reprint. Not a generic.

I’ve been bending wrenches since before the 722.6 came out, and I’ve seen more than one shop scrap a perfectly good 722.9 because they used a spec from a obtained PDF that had the wrong planetary preload. This manual stops that. It shows you the Ravigneaux gear set layout, tells you which clutches apply for each gear, and gives you the OEM fluid fill procedure that accounts for temperature compensation. Page 26 has the torque converter bolt tightening sequence – 25 N·m then 90° turn. That kind of detail doesn’t show up in aftermarket copies.

Features of the 722.9 Transmission

Page 3 lists the electronic control system: seven forward speeds, two reverse, torque converter that stays in slip mode across all forward gears. Four multi-disc brakes, three multi-disc clutches – no sprag units. Three planetary gear sets: two simple planetary units and one Ravigneaux set. The transmission control module is bolted right inside the valve body, flash-capable through the CAN bus. If you’ve ever chased an intermittent shift flare, you know how critical that flash data is. The manual explains the adaptation strategy so you can reset it properly after an overhaul.

Advantages Over Earlier Generations

Page 4 spells out the numbers: shift reaction time cut by 0.1 second, downshifts reduced 0.2 second, coasting downshifts trimmed by 0.4–2.5 seconds. 37–74u202fmph acceleration times shortened 23–28% depending on model. Fuel economy improvement up to 4%. All due to the hydraulic circuit redesign and the faster processor inside the valve body. The manual gives you the oil flow diagrams so you can trace a pressure drop without pulling the whole unit. That’s worth the price alone.

Transmission Applications: Which Vehicles Use the 722.9?

Page 5 confirms that the 722.9 started in select MY 2004 non-4MATIC vehicles with the naturally aspirated M113 engine: S430, S500, CL500, E500, SL500. The same transmission is also called NAG 2 or 7G‑Tronic. The older 722.6 will continue on certain models until 2012, but if you’re working on anything with a 7-speed from 2004–2010, this is the document that matches your hardware. For a broader understanding of the 722.9’s predecessor, check the Mercedes-Benz 722.9 W7A700 Technical Manual for cross-referencing. If you’re working on a W220 chassis, the Mercedes-Benz W220 2012 Technical Manual – ACC Hidden Menus covers climate control menus. For diesel applications, the 2007 Unimog Technical Manual – BlueTec Diesel System is relevant.

3 Reasons to Trust Factory OEM Documentation

First, the torque values come straight from the Mercedes-Benz engineering group, not from a well-meaning forum member with a hand‑held torque wrench. Second, the wiring diagrams show the pin‑to‑pin connections for the electro‑hydraulic control unit. Aftermarket manuals often combine diagrams across model years and you end up with a crossed pin that kills the TCM. Third, the 2004 date stamp tells you this was printed during the 722.9’s introduction; the adaptation tables and solenoid resistances haven’t been altered by later revisions. That’s critical when you’re retrofitting or diagnosing early units.

What Torque Values Are Listed?

The manual includes the torque converter‑to‑flexplate bolts, valve body bolt torque, oil pan bolt sequence with step‑up torque, and the planetary carrier bolt preloads. It also gives the shift solenoid retention torque and the plug‑connector bolt torque. This is not a generic list; every value is tied to a specific step in the removal and installation procedure. If you skip the torque sequence on the valve body, you’ll warp the separator plate and get cross‑leaks. Page 26 covers the converter bolt torque step I mentioned earlier.

Access the Factory Manual

The 722.9 is a different animal from any previous Mercedes automatic. The integration of the TCM inside the valve body means one mistake – wrong fluid type, wrong fill level, wrong solenoid resistance check – takes out the whole assembly. This 79‑page OEM document is your insurance. Every spec, every diagram, every step comes from the same engineers who designed the transmission. Compare that to an aftermarket reproduction that has been scanned, re‑scanned, and printed until the torque numbers are illegible. If you want to do the job once and move on to the next bay, Manual Transmission or automatic, the principle stays the same: start with the factory data. This manual gives you that data. Access the Factory Manual now and keep it on the bench next to your scan tool. Manual Transmission”>Manual Transmission service intervals differ, but the logic is the same – specs first, then tools.

Frequently Asked Questions

Does this manual cover the valve body removal procedure?

Yes. The valve body removal steps are illustrated with fastener locations and torque values. It also covers the removal of the solenoid module and the integrated TCM.

Can I use this manual for the 722.6 transmission?

No. The 722.6 uses a different hydraulic circuit, different solenoid resistances, and a different torque converter lockup strategy. Using 722.9 specs on a 722.6 will cause shift quality complaints and potential clutch damage.

Are fluid capacities listed?

Yes. The manual includes the initial fill volume and the correct level check procedure using the dipstick at a specific fluid temperature (80°C). Aftermarket manuals often skip the temperature requirement.

What publication year is this?

2004. It is the original technical training document released alongside the 722.9 introduction. Later updates exist, but this is the baseline that all subsequent bulletins reference.