9
Operation
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.
Selecting LOW from Neutral:
•
If LOW mode is selected from Neutral while stopped, the starting
gear is always 1st gear. The starting gear cannot be changed in LOW
mode.
•
If LOW mode is selected from Neutral while stopped, 1st gear is
maintained - no shifts are performed, except for conditions noted
below.
Selecting LOW from Drive or MANUAL while moving:
•
If LOW mode is selected while moving, no upshifts are performed,
except for override conditions noted below.
•
Downshifts are performed at higher RPM’s than normal to enhance
engine braking. The downshift point is chosen so engine speed after
the shift is about 50 rpm below engine rated speed.
Some engines do not use the Eaton overspeed protection.
Transmission LOW Override:
•
If the vehicle is being back driven and the engine is approaching a
higher than normal level (approximately 300 rpm above rated
speed), the AutoShift overrides the LOW position and performs an
upshift to prevent engine damage.
•
If the gear being maintained is higher than the starting gear, and the
driver depresses the pedal, the AutoShift system will override the
LOW mode and shift to the best available gear if the engine lugs
excessively.
WARNING
Summary of Contents for FO-6406A-ASX
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