3-64

Section 3 - Operation

Transmission Operation

Autoshift

This auto shift mode can be used to simulate the functionality of a typical automatic transmission on an automobile.. Machine speed is controlled by throttle position and load.. The transmission will upshift to the maximum sustainable gear and downshift when load increases or speed reduction is requested..

Autoshift mode can be used to achieve the maximum performance of the machine.. If the load to the machine increases and the engine is lugged down below the optimum operating point in any gear, the transmission will automatically downshift to provide optimum performance.. When the load condition has passed, the transmission will automatically upshift to maximize speed and output of the machine..

Transmission shift points are determined by transmission output speed (engine speed)..

Once in autoshift mode, selecting a certain gear using the shifter will set the maximum gear that the transmission can operate up to.. For instance, if the operator upshifts to F12, then the machine will only shift up to F12, even if it is capable of operating in gears above F12.. Similarly, if the max gear is set at F12 and the machine is loaded and only capable of operating in F9, then it will stay in F9 until the load condition has subsided..

NOTE: The autoshift mode is meant to operate with the throttle set to full. If operating at part throttle, the machine may not upshift because the upshift point might not be reached at part throttle conditions. Similarly, if the throttle is lowered to the point where the downshift point is reached, it will downshift even if the machine is not loaded.

Autoshift Enable and Termination

The autoshift mode will be engaged through the use of the momentary SPDT auto function switch (1).. Press and release the front/symbol of the switch to engage autoshift.. Press and release the switch again to disengage the autoshift function.. The letter “A” will be displayed in the powershift display (2) when autoshift is engaged..

Once engaged, the transmission enters autoshift mode between F1 and the max gear limit set to the current desired gear.. The operator is then allowed to upshift or downshift to change the max gear limit..

When autoshift mode is disengaged through the use of the auto function switch, the transmission will remain in the current gear and enter manual shift mode..

1

F3-139

GEAR

2

F3-138

Rules of Operation

During autoshift, all manual upshifts and downshift requests using the bumpshift lever to upshift / downshift will be utilized to change the max gear limit.. All shifts will be performed automatically based to autoshift shift points..

During autoshift, if the inching pedal is pressed or if the shifter is placed into Neutral, the function will be terminated immediately..

•Upon inching pedal release or placing the shifter back into gear, gear selection will be based upon the selection made by the Speed Matching function..

•If the inching pedal was pressed down or the shifter placed into Neutral while operating in a gear that is at or above the max allowed launch gear, and if the tractor coasted to slow speeds or stop, unless changed by the operator while the inching pedal is down or in Neutral, the max allowed start gear will be used to launch the machine..

•Otherwise, the gear previously operated in that is below the max allowed launch gear will be used..

•The transmission will not resume autoshift mode until the operator request the activation autoshift through the auto function switch..

•If a shuttle shift is attempted while in autoshift, the shuttle shift will be initiated through the normal shuttle shift routine and autoshift will be disabled..

435/485/535