Paccar TX-18 - MAX Mode; Neutral Coast Mode; Optimized Gear Selection

vehicle, until first gear is achieved (see
Low Mode Operation on page 38 for use).
Use Low mode to
•
Stop the vehicle when carrying a
heavy load while remaining in gear
– this is assisted by activating the
engine brake (see Engine Brake
Operation on page 30).
• Maintain smooth, continuous power
when going up or down steep
grades at a low vehicle speed (10
mph or less).
NOTE
Overspeed protection remains active
while Low mode is engaged.
MAX Mode
MAX mode applies engine braking and the
transmission lower gears to quickly slow
the vehicle without using, and potentially
overheating, the service brakes or rocking
the cab.
NOTE
MAX mode is not a substitute for using
the service brakes in urgent situations.
When activated, MAX displays on the
Engine Brake Indicator (see Engine Brake
Indicator on page 23) and the
transmission begins downshifting and
using 100% engine braking. The
transmission stops downshifting in 7
th
gear
, the coastdown gear. See MAX Mode
Operation on page 39 for use.
Neutral Coast Mode
Neutral Coast mode places the
transmission into Neutral on slight downhill
grades, improving fuel economy. Neutral
Coast mode only operates when cruise
control is active and the transmission is in
Drive.
When Neutral Coast Mode is active, the
engine will drop to idle speed and the
transmission will disengage. The gear
display shows a green N when Neutral
Coast mode is active. The transmission
exits Neutral Coast, returning to an
appropriate gear, when the
• Vehicle brake is applied
•
Operator depresses accelerator
pedal
•
A mode other than Drive is
selected
• Operator performs an upshift or
downshift request
• Cruise control is canceled
• Cruise high or low set speeds are
exceeded
• Maximum vehicle grade is
exceeded
• Driver Assistance systems (ADAS)
make a brake request
Optimized Gear Selection
This feature will automatically select the
start gear depending on the following
conditions:
• Vehicle weight (load)
• Road grade
• Axle / transmission ratio
The start gear selection can be changed
using an upshift or downshift request, as
long as the selection requested would not
cause transmission damage or engine
lugging.
FEATURES - MAX Mode
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