The other four ratios in the front section are used
once in low range and once again in high range;
however, each of the five ratios (low–1–2–3–4) in low
range and each of the four ratios (5–6–7–8) in high
range can be split with the overdrive splitter gear.
All of the 18 speeds are controlled with one shift
lever. A range preselection lever and a splitter control
button are built into the shift knob. The range prese-
lection lever controls range selection and the splitter
control button (located on the side of the shift knob)
controls gear splits.
Operation, Eaton Splitter and Range-
Shift
IMPORTANT: The shifter knob has an interlock
feature that prevents the splitter control button
from being moved forward when the range pre-
selection lever is down (in low range); when in
high range and the splitter control button is in
the forward position, the range preselection
lever cannot be moved down.
1.
When operating off-road, or under adverse condi-
tions, always use low gear when starting to move
the vehicle forward.
When operating on-highway, with no load, or
under ideal conditions, use 1st gear when start-
ing to move the vehicle forward.
For all conditions, use the highest gear that is
still low enough to start the vehicle moving with
the engine at or near idle speed, and without
slipping the clutch excessively.
2.
Use the clutch brake to stop gear rotation when
shifting into low (or 1st) or reverse when the ve-
hicle is stationary. The clutch brake is actuated
by depressing the clutch pedal all the way to the
floor.
For normal upshifts and downshifts, only a partial
disengagement of the clutch is necessary to
break engine torque.
3.
Use double-clutching between all upshifts and
downshifts that require movement of the shift
lever. Splitting of the high range gears does not
require movement of the shift lever.
4.
Never move the shift lever into low gear while in
high range.
5.
Never move the splitter control button while in
neutral.
6.
Do not preselect with the splitter control button;
after moving the control button, complete the
shift immediately.
7.
Except when downshifting from 5th direct to 4th
gear, never push the range preselection lever
down into low range while operating in high
range—the splitter will become inoperative.
8.
Do not shift from high range to low range at high
vehicle speeds.
9.
Do not make range shifts with the vehicle moving
in reverse gear.
10. Never attempt to move the range preselection
lever with the gear shift lever in neutral while the
vehicle is moving. Preselection with the range
preselection lever must be made prior to moving
the shift lever out of gear into neutral.
11. After your shifting ability improves, you may want
to skip some of the ratios. This may be done
only
when operating conditions permit, depend-
ing on the load, grade, and road speed.
Upshifting
1.
Position the gear shift lever in neutral. Start the
engine, and bring the air system pressure up to
100 to 120 psi (689 to 827 kPa).
2.
Position the range preselection lever down, into
low range. See
Fig. 8.17
for 13-speed transmis-
sions and
Fig. 8.18
for 18-speed transmissions.
3.
Make sure the splitter control button is in the di-
rect (rearward) position.
4.
For 13-speed transmissions:
Depress the clutch to the floor, shift into low or
1st gear; then engage the clutch, with the engine
at or near idle speed, to start the vehicle moving.
Accelerate to 80 percent of engine governed
speed.
For 18-speed transmissions:
Depress the clutch to the floor, shift into low;
then engage the clutch, with the engine at or
near idle speed, to start the vehicle moving.
To shift from low direct to low overdrive, move
the splitter control button (
Fig. 8.18
) into the
overdrive (forward) position, then immediately
Transmissions
8.19
