General Information, ESS
Refer to the Meritor website for additional information, www.meritor.com .
9–Speed and 10–Speed M, MO, RS, and RSX Models
Meritor 9-speed and 10-speed automated transmissions do not require use of the clutch except to start and stop the vehicle.
Note: Meritor M and MO series ESS transmissions are available only on vehicles equipped with either Caterpillar or Cummins electronic engines. Meritor RS and RSX series ESS transmissions are only available on vehicles equipped with Detroit Diesel electronic engines.
The ESS system works with the engine fuel control system to automatically synchronize engine rpm to road speed during gear changes. Use the clutch only to start and stop the vehicle and to shift into forward or reverse. The HI and LO ranges are automated, so the driver does not have to select ranges. A "break torque" feature allows the driver to move the shift lever and take the transmission out of gear without changing throttle position. Throttle position can be maintained while braking and downshifting through the gears when stopping the vehicle, as well as on steep grades.
The major components of the ESS system are the system switch, shift-intent switch, input and output shaft speed sensors, a Neutral position sensor, and an electro-pneumatic solenoid.