Kenworth T410, Driver'S Handbook Manual

Page: 152 / 418

Page 126 CAT: 8612 November 2019
OPERATING INSTRUCTIONS
Multiple gear upshifts and downshifts may be allowed when the up/
downshift request procedure is performed multiple times (Each request
equals one gear change request).
• The transmission may also deny a shift while ascending or
descending grades if the load of the vehicle, and grade of the terrain
in combination with the drivetrain ratio and engine torque will fall
outside of the acceptable range to perform a shift. If the shift is
denied it will sound a tone.
*If you attempt to select a non-neutral mode without depressing the service
brakes the transmission will not shift into gear and you will have to return to
Neutral and depress the brakes before selecting the desired mode again.
Reverse Mode
• Reverse mode selects the default R everse gear. (see Note* page
126).
• Each time R everse is selected from N eutral, the default R everse
gear is engaged.
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 (see Note* page 126).
The starting gear cannot be changed in LOW mode.
• If LOW is selected while moving, the transmission will not upshift
(except for the Transmission Override conditions noted below).
The transmission system will downshift at the earliest opportunity
to enable higher than normal engine RPM to provide maximum
engine braking.
Transmission LOW Override
• If the vehicle is being back driven and the engine is approaching a
higher than normal level, the transmission system will override the
MANUAL position and perform and upshift.
The PACCAR Transmission initiates upshifts from Low and Manual for
engine overspeed protection above governed speed.
On slippery surfaces minimize engine braking in LOW mode.
Excessive engine braking at higher engine RPM could cause a loss
of traction and vehicle control.