Meritor Range-Shift Transmissions - freightliner CENTURY CLASS S Driver Manual

Downshifting
1. With the transmission in high range, shift pro-
gressively downward to the bottom gear in high
range, double-clutching between shifts.
2. When in the bottom gear of the high-range shift
pattern, and ready for the next downshift, push
the range preselection lever down into low range.
Double-clutch through neutral, and shift into the
top gear of the low-range shift pattern. As the
shift lever passes through neutral, the transmis-
sion will automatically shift from high range to
low range.
3. With the transmission in low range, downshift
through the low range gears, as conditions re-
quire.
IMPORTANT: Never use the clutch brake when
downshifting, or as a brake to slow the vehicle.
Meritor Range-Shift
Transmissions
Refer to the Meritor website for additional informa-
tion, www.arvinmeritor.com.
General Information, Meritor Range-
Shift
9-Speed RM, RMO, and RMX Models
Meritor 9-speed transmissions have a 5-speed front
section, and a 2-speed auxiliary section. The low
gear in the front sections of the "A" and "B" ratio
transmissions is used only as a starting ratio. The
high gear in the front section of the "R" ratio trans-
missions is used only as the top gear. The remaining
gear positions of the above transmissions are used
once in the low range and once in the high range.
See Fig. 8.21 for the shift patterns.
NOTE: The 3rd/7th and 4th/8th shift positions in
the RM and RMX (direct ratio) are opposite of
the RMO (overdrive ratio) transmissions. The
RMX-R ratio transmissions have the 1st/5th shift
positions where low is in the A and B ratio trans-
missions. The top gear in the RMX-R ratio
transmissions is called 9th gear.
10-Speed RM and RMX Models
Meritor 10-speed transmissions have ten evenly-
spaced forward ratios. Each transmission consists of
a 5-speed front section, and a 2-speed auxiliary sec-
tion. The ten forward speeds are obtained by twice
using a 5-speed shift pattern: the first time in low
range; the second time in high range. See
for the shift pattern.
Operation, Meritor Range-Shift
Reverse
To drive in reverse, push the range selector lever
down to put the transmission in the low range. Push
the clutch pedal to the bottom of travel so the clutch
brake slows the transmission for initial gear engage-
ment. Holding the clutch pedal at the bottom of
travel, shift into reverse.
Slowly release the clutch pedal to move the vehicle
in reverse.
Upshifting
1. To drive forward, make sure the vehicle is com-
pletely stopped and the range selector lever is
pushed down to put the transmission in the low
range.
Push the clutch pedal to the bottom of travel so
the clutch brake slows the transmission for initial
gear engagement; holding the clutch pedal at the
bottom of travel, shift into low.
2. Slowly release the clutch pedal to begin moving
the vehicle forward.
3. To upshift into 1st gear, only partial depression of
the clutch pedal is needed. Do not push the
clutch pedal all the way to the floor and engage
the clutch brake; instead, partially depress the
clutch pedal, and move the shift lever into neu-
tral.
4. Release the clutch, and allow the engine to de-
celerate until the road speed and the engine rpm
match.
5. Partially depress the clutch pedal, and move the
shift lever into first gear.
6. Double-clutch and continue upshifting until you
reach the top gear in the low range, 4th gear in
9-speed models and 5th gear in 10-speed
models. See Table
Transmissions
Fig. 8.22
8.3.
8.24