ATSG

  • Mercedes 722.9 transmission is a two part case (Figure 1). The converter housing is made of die-cast aluminum. The main transmission case or housing is made of die-cast magnesium.
  • When it comes to automotive repair, and in particular automatic transmission repair, being on the diagnosing and repairing end of this increased technology is an incredible challenge. 
  • After a good long test drive to relearn the shift adapts, sometimes a shifting or engagement problem remains. Assuming that there is not excessive wear in the valve body and the linear solenoids are good, the clutch control valves on the valve body can be adjusted to correct these problems.
  • Whether you have a 2-wheel drive or 4-wheel drive vehicle equipped with a 6R140 (commonly referred to as the Torqshift 6), there is only 1 valve body listed for this transmission. 
  • This transmission is notorious for solenoid malfunction causing a wide variety of shift complaints. One of which can be harsh garage shifts into gear such as from Park to Reverse. 
  • The ZF6HP19, ZF6HP26 and ZF6HP32 are considered ZF-6 speed series Generation or version 1 transmissions.  Consequently, ZF6HP21, ZF6HP28 and ZF6HP34 are considered as Generation or version 2 ZF-6 speed transmissions.
  • Changing the sensor and cleaning the connector will fix the problem but if the hose leak isn’t addressed, it will only be a matter of time before this problem repeats itself.
  • Audi or BMW vehicles, equipped with the ZF5HP-19/ FL/FLA may exhibit a condition of a firm engagement in the Drive position accompanied with a harsh coast-downshift. This condition will typically get more pronounced when hot.