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Controls and Operating
4. 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 to 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.
5. Manual Mode Switch
Allows the transmission operation to be changed from Automatic to Manual.
When at the 'ON' position it is used to perform stall checks, clutch pressure
checks and, if necessary, to move the machine to a repair area. The manual
mode can only be used if the Mode Selection Switch is in the 'POWER'
position and the transmission is in Neutral.
Do not operate engine for more than 30 seconds at full throttle with
transmission in gear and output stalled as this will result in severe
overheat damage to the transmission.
The manual mode is not intended to be used for normal operations.
The machine should only be driven at very low speeds in first or
reverse gears if the manual mode is activated, or damage to the
transmission may result.
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MANUAL AUTO POWER ECONOMY
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MANUAL AUTO POWER ECONOMY
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