Paccar TX-18, Operator'S Manual

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pressing and releasing the Hill Start Aid
Disable Switch (see
Hill Start Aid (HSA)
Disable Switch on page 31).
Vehicle Facing Uphill – Forward
Mode
Vehicle must be on an incline of 2% or
greater and in a forward mode.
1. Bring vehicle to a stop and depress
the service brakes.
2. Release the service brakes to
launch the vehicle.
WARNING
After Hill Start Aid releases, apply the
vehicle service brake to remain stop-
ped, or use the accelerator pedal to
launch the vehicle. Failure to do so
could result in unintended vehicle
movement resulting in property dam-
age, personal injury, or death.
Vehicle Facing Downhill - Reverse
Mode
Vehicle must be on a decline of 2% or
greater and in Reverse mode.
1. Bring vehicle to a stop and depress
the service brakes.
2. Release the service brakes to
launch the vehicle.
WARNING
After Hill Start Aid releases, apply the
vehicle service brake to remain stop-
ped, or use the accelerator pedal to
launch the vehicle. Failure to do so
could result in unintended vehicle
movement resulting in property dam-
age, personal injury, or death.
Low Mode Operation
WARNING
On slippery surfaces, minimize engine
braking in Low mode. Excessive en-
gine braking at higher engine rpm may
cause a loss of traction and vehicle
control. Failure to comply may result in
property damage, personal injury, or
death.
NOTE
Activating Low mode while using
cruise control will downshift the trans-
mission into the lowest gear that also
maintains vehicle speed above the
cruise control minimum speed set-
point, keeping cruise control active.
Canceling cruise control allows the
transmission to downshift into the low-
est gear.
This procedure begins at engine start,
selecting the lowest available gear. If Low
mode is selected while moving, the
transmission will downshift at the earliest
opportunity, using the higher-than-normal
engine rpm to provide maximum engine
braking.
1. Start the vehicle.
2. Press and hold the service brake.
OPERATION - Low Mode Operation
38 Y53-1349-1A1 (02/2022)
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