The instument cluster will illuminate with
the corresponding gear.
Gear Display
LOW Mode
LOW mode should be used any time you
want to maximize engine braking and
minimize the use of the brake pedal. For
example, when driving down long grades
or when coming to a stop.
• Selects lowest available gear for
start gear. The starting gear cannot
be changed in LOW mode.
NOTE
If the driver attempts to select a non-
neutral mode without depressing the
service brakes the transmission will not
shift into gear. The driver must re-select
Neutral and depress the service brakes
before selecting the desired mode
again.
• If LOW is selected while moving,
the transmission will not upshift
(except for the Transmission
Override conditions noted on the
previous page). The transmission
system will downshift at the earliest
opportunity to enable higher than
normal engine RPM to provide
maximum engine braking.
WARNING
On slippery surfaces minimize engine
braking in LOW mode. Excessive en-
gine braking at higher engine RPM
could cause a loss of traction and vehi-
cle control.
NOTE
The PACCAR Automated Transmission
initiates upshifts from MANUAL and
LOW for engine overspeed protection.
How to Deactivate MAX Mode
Vehicles with automated transmissions will
have the engine brake function integrated
with the transmission controls. Follow
these steps to deactivate MAX engine
brake mode.
1. Accelerate with the throttle pedal.
2. Upshift, see Up or Down Shifting
on page 15.
3. Wait for the transmission coast
down gear to engage.
DRIVING - Up or Down Shifting
16 Y53-1272-1B1 (08/17)
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