NOTE: If conditions are difficult, start out in LO-
LO. Move the DEEP REDUCTION lever on the
dashboard to the IN position. Otherwise start
out in LO with the DEEP REDUCTION lever in
the OUT position.
3.
Depress the clutch pedal to the floor. Shift into
LO gear; then, engage the clutch, with the
engine at or near idle rpm to start the vehicle
moving. The vehicle will start in LO or LO-LO
depending on the DEEP REDUCTION lever
position.
4.
To upshift if in LO-LO, move the DEEP
REDUCTION lever to the OUT position and
immediately release the accelerator, depress the
clutch pedal once to break torque, and reengage
the clutch. The auxiliary section will shift from
LO-LO to LO when the gears reach the same
speed.
5.
Shift progressively upward from LO through 1st,
2nd, 3rd, and 4th gears while the range
preselection lever is in LO. Always double-clutch
between gears.
6.
When in 4th gear and ready for the next upshift,
pull up the range preselection lever and move
the shift lever, double-clutching, to the 5th gear
position. As the shift lever passes through
neutral, the auxiliary section will automatically
shift from low to high range.
NOTICE
Never move the shift lever into the LO gear
position after high range preselection or anytime
the auxiliary section is in high range.
Transmission damage could result.
7.
Continue upshifting from 5th gear through 8th
gear, always double-clutching between gears.
Downshifting
1.
While in high range, move the gear shift lever
from 8th gear through 5th gear as conditions
require, always double-clutching between gears.
2.
When in 5th gear and ready for the next
downshift, push down the range preselection
lever and move the shift lever to the 4th gear
position, being sure to double-clutch. As the shift
lever passes through neutral, the auxiliary
section will automatically shift from high to low
range.
3.
While in the low range, continue downshifting
from 4th through LO as conditions require,
always double-clutching between gears.
4.
Do not downshift into LO-LO from LO unless
operating conditions make it necessary. If it is
necessary, make sure that the shift lever is in the
LO gear position and the auxiliary section is in
the low range. Then, move the DEEP
REDUCTION lever on the dashboard to the IN
position. Immediately release the accelerator,
depress the clutch pedal once to break torque,
engage the clutch, and accelerate. The auxiliary
section will automatically shift from LO to LO-LO
when the gears reach the same speed.
NOTICE
Never use the clutch brake when downshifting, or
as a brake to slow the vehicle. This will cause
premature clutch brake wear.
Clutch
General Information
The hydraulic clutch control system consists of a
pedal unit and a slave cylinder connected by a
hydraulic hose. The components of the system have
been specially designed to use DOT 4 brake fluid.
The hydraulic system is self-adjusting.
Typical operation will not break down the clutch
friction surfaces. Heat and wear are almost
nonexistent when a clutch is fully engaged. However,
during the moment of engagement, when the clutch
is picking up the load, considerable heat is
generated. If a clutch slips excessively, high
temperatures develop quickly between the flywheel,
driven discs, and pressure plates. An improperly
adjusted or slipping clutch can generate
temperatures high enough to cause the friction-facing
material to char and burn, destroying the clutch.
To ensure long service life of the clutch, start in the
right gear and be alert to clutch malfunctions.
Clutch Operation
Clutch Break-In
With a new or newly installed clutch, the clutch may
slip for a short time while the friction surfaces break-
in. However, allowing the clutch to slip for more than
two seconds can severely damage the clutch disc,
pressure plate, and the flywheel.
Manual Transmissions, Clutch, and Transfer Cases
15.5
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