Terex TR60 Maintenance Manual page 73

the range selector in direct response to throttle
position and transmission output speed.
When Reverse is selected the reverse alarm sounds and
the reverse light illuminates at the rear of the vehicle. This
feature warns personnel to the immediate rear of the
vehicle that the operator has shifted to reverse.
When drive 'D' is selected, the transmission
automatically upshifts and downshifts through all six
forward ranges as required by loads and travel
speeds. Selecting a lower range (4th, 3rd etc.) limits
the highest range to which the transmission will
automatically upshift.
If a lower range is selected while moving forward, the
transmission automatically downshifts sequentially to
the selected lower range at maximum controlled
engine speeds. Downshifts will not occur until vehicle
is slowed by use of the service brakes and/or retarder.
When shifting from neutral to start from a standstill, or
to reverse direction, decelerate the engine to idle
speed. To move forward, select drive 'D' and
accelerate the engine to the vehicle load and speed
requirements. The transmission will automatically
upshift from 1st through 6th ranges as travel speed
increases.
With the throttle fully depressed, and the mode
selection switch in the Power position, the
transmission upshifts to the next higher range when
the engine attains maximum rated speed, since
maximum power train output is needed under this
condition. At lower throttle settings where minimum
power train performance is required, the transmission
will upshift to the next higher range at less than
maximum rated engine speed.
Upgrades or soft spots might slow travel speed, even
at full throttle, requiring transmission downshifts to
maintain maximum powertrain performance. When this
occurs, the transmission downshifts automatically.
Shift the transmission to the next lowest range if
transmission 'Hunting' or 'Shift Cycling' occurs.
When temporarily stopped, such as for yielding the
right-of-way to a loaded vehicle, the transmission can
be left in the selected range and the vehicle held
stationary with the service brakes.
However, when stopped for a more extended period
with the engine left running, shift the transmission to
neutral to avoid unnecessary heat buildup and apply
the parking brake.
SM 1575 Rev 2 11-00
Transmission - CEC Plus II Shift System
WARNING
Always select Neutral and apply the parking
brake before leaving the operator's seat.
5. Mode Selection Switch - Gives the option to select
between transmission Power and Economy shift
schedules. The transmission must be in Neutral before
the switch will function.
The transmission torque converter is equipped with a
lockup clutch which, when engaged by the ECU, locks
the converter pump and turbine together as a single
unit and allows power to be transmitted mechanically
from the engine directly to the transmission gearing on
a 1:1 ratio. When the lockup clutch is disengaged, the
torque converter acts as a fluid coupling, multiplying
torque when engine speed is significantly higher than
transmission output shaft speed.
When the mode selection switch is in the Power
position, the ECU controls operation of the lockup
clutch according to signals received by the throttle
position sensor (giving engine speed as a percent of
throttle), the transmission output shaft speed sensor,
and range selector. The ECU may delay application of
the lockup clutch and allow torque multiplication by the
torque converter to take place until a balance is
achieved between engine speed and transmission
output shaft speed before activating the lockup clutch.
Power versus Economy Mode
The Power mode is designed for applications involving
heavy loads and hilly duty cycles where performance
rather than fuel economy is of prime importance.
The Economy mode is designed for applications
involving lighter loads and level duty cycles or where
fuel economy is more important than performance.
In the Economy mode, the ECU controls operation of
the lockup clutch with a timed, preprogrammed
schedule where in second through sixth gears the
lockup clutch is disengaged only long enough to allow
the torque converter's fluid coupling to absorb shift
shock. Otherwise, the lockup clutch is engaged and no
torque multiplication takes place in second through
sixth gears.
6. Manual Mode Switch - The manual mode facility is
designed as a Service Technician facility to allow stall
checks and clutch pressure checks to be implemented
by Service Personnel, and permit movement of the
vehicle, if necessary, to a repair area. With the manual
mode switch in the 'On' position, the body up interlock
Section 120-0070
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