Range Hold - Bell B35E 6X6 ADT Operator's Manual

If the operator just down-shifts or just uses the service
brakes while going downhill, he may lose full control of
the vehicle.
To help in keeping full control on down-hills, use a
combination of down-shifting and braking.
Down-shifting to a lower gear increases engine
braking and helps the operator maintain full control.
The transmission has a feature which prevents
automatic up-shifting above the lower gear
selected. However during downhill operation, if
engine governed speed is exceeded in the lower
gear, the transmission may shift to the next higher
gear. This will reduce braking and may cause loss
of control.
Apply service brakes to prevent exceeding engine
governed speed in the lower gear selected.
Shift Control
Occasionally road conditions, load or traffic
conditions will make it desirable to restrict
automatic shifting to a lower gear. Lower gears
provide greater engine breaking for going down
grades (the lower the gear; the greater the braking
effect).
Even though a lower gear was selected, the
transmission may not down-shift until machine
speed is reduced
The shift control utilises the (Up) and (Down) arrow
buttons on the SSM to select individual forward
gears. The CDU screen will display the operator's
choice.
Even though a lower gear was selected, the
transmission may not down-shift until machine
speed is reduced .
Use 1st gear when pulling through mud and deep
snow, when manoeuvring in tight spaces or while
driving up/down grades.
1st gear provides the machine with maximum
driving torque and maximum engine braking effect.
When selecting D from N and the bin is raised (bin
raised warning indicator is illuminated), the
transmission will limit gear selection to 1st gear.
The CDU display will show "1".
As soon as the bin is fully lowered (bin raised
warning indicator is extinguished), the transmission
will automatically revert to normal gear selection.
OPERATING INSTRUCTIONS
Lowering The Bin
The machine has just been emptied and the bin is
at 100%. The operator selects drive, and at the
same time operates the bin-down switch thus
activating the detent.
While the bin is between 100-50%, the machine is
limited to only 1st gear. When the bin passes the
50% mark, the machine will allow shifting into 2nd
gear and at the same time limits the truck to a
maximum of 2nd gear while being between the
points of 50-15%.
As the bin passes the 15% mark, the machine will
allow shifting into 3rd gear as the maximum. The
machine will remain limited to a maximum of 3rd
gear until the bin reaches 5%. At this point the
detent becomes de-activated, and the bin float
comes into effect. All limits are switched off, and the
machine drives as normal.
The CDU display will show "2" as long as
retardation is in progress and will revert back to the
original displayed value when:
• 2nd gear is attained and the machine has slowed
down almost to a stop
• or when the operator applies the accelerator to
cancel retardation.
The engine exhaust brake is automatically
applied and the exhaust brake warning indicator
is illuminated during the above retardation period.

Range Hold

The range hold switch (on the SSM) allows the
operator to manually hold the transmission in a
gear of his choice to prevent shift cycling to improve
cycle time in abnormal operating conditions.
The operator must watch gear position and engine
rpm. When a lower gear is selected than the gears
which the transmission is cycling between and
engine speed. is increasing, the range hold switch
must be applied.
When the switch is actuated, the gear which the
transmission is in at the time, will be held.
No up-shifting will happen beyond this gear (except
in over-speed conditions) but down-shifting is
allowed.
The held gear is displayed on the CDU.
When the range hold switch is switched OFF,
normal gear selection (up shifting) will continue and
the CDU display will show the original value.
OPERATION