Meritor Engine Synchro Shift (Ess) Automated Models - freightliner CENTURY CLASS S Driver Manual

5th, 5th to 7th, and 7th to 9th. With the shift but-
ton forward—2nd to 4th, 4th to 6th, 6th to 8th,
8th to 10th.
NOTE: Lever-only shifts skip an entire gear ratio
and will require the engine rpm to decrease
twice the amount of a normal shift.
5. Combination button/lever shift—Preselect the
next gear by sliding the shift button rearward.
Break torque by releasing the throttle and de-
pressing the clutch pedal. Double-clutch and
move the shift lever to the next desired gear po-
sition.
The combination button/lever shift is used for
gear changes from 2nd to 3rd, 4th to 5th, 6th to
7th and 8th to 9th.
Downshifting
CAUTION
Do not attempt a button-only downshift at too
high an engine speed (generally above 1400
rpm). Doing so could result in damage to the en-
gine, transmission, and/or driveline.
1. Button-only shift—With the throttle still applied,
preselect the next gear by sliding the shift button
rearward. Break torque by releasing the throttle
or by depressing the clutch pedal. Increase en-
gine speed to synchronize the engine speed with
the transmission speed. The shift will complete
when the engine rpm has increased to the
proper speed.
The button-only shift is used for gear changes
from 10th to 9th, 8th to 7th, 6th to 5th, 4th to 3rd,
and 2nd to 1st.
CAUTION
Do not attempt a lever-only downshift at too high
an engine speed (generally above 1000 rpm).
Doing so could result in damage to the engine,
transmission, and/or driveline.
2. Lever-only shift—Break torque by releasing the
throttle and depressing the clutch pedal. Double-
clutching, move the shift lever to the next desired
gear position.
The lever-only shift is used to skip a full gear.
With the shift button rearward—9th to 7th, 7th to
5th, 5th to 3rd, and 3rd to 1st. With the shift but-
ton forward—10th to 8th, 8th to 6th, 6th to 4th
and 4th to 2nd.
IMPORTANT: Never use the clutch brake when
downshifting, or as a brake to slow the vehicle.
CAUTION
Do not attempt a combination button/lever down-
shift at too high an engine speed (generally
above 1400 rpm). Doing so could result in dam-
age to the engine, transmission, and/or driveline.
3. Combination button/lever shift—With the throttle
still applied, preselect the next gear by sliding
the shift button forward. Break torque by releas-
ing the throttle and depressing the clutch pedal.
Double-clutch and move the shift lever to the
next desired gear position.
The combination button/lever shift is used for
gear changes from 9th to 8th, 7th to 6th, 5th to
4th, and 3rd to 2nd.
Meritor Engine Synchro Shift
(ESS) Automated Models
Refer to the Meritor website for additional informa-
tion, www.arvinmeritor.com.
General Information, ESS
9–Speed and 10–Speed M, MO, RS, and
RSX Models
Meritor 9-speed and 10-speed automated transmis-
sions do not require use of the clutch except to start
and stop the vehicle.
NOTE: Meritor M and MO series ESS transmis-
sions are available only on vehicles equipped
with either Caterpillar or Cummins electronic
engines. Meritor RS and RSX series ESS trans-
missions are only available on vehicles
equipped with Detroit Diesel electronic engines.
The ESS system works with the engine fuel
control system to automatically synchronize en-
gine 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
Transmissions
8.32