Gear selection, function

After actuating the shift control unit, GS/EPS (A15) the signals are read in by the GS/EPS electronic control unit (A16). This actuates the corresponding solenoid valves of the shift cylinders in order to implement the driver request, taking into account operational safety.

The driver perceives the shift operation through an electromechanical system in the shift control unit, GS/EPS (A15) while confirmation of it is also shown on the display. In the event of incorrect operation, an audible warning is given by the warning buzzer.

The gearshift is only performed if the driver has depressed the clutch pedal fully and for a sufficiently long period.

-----------------------------------------------------------------------------------------

If the clutch pedal is released prematurely, the transmission automatically shifts into the Neutral position. Transmission position "N" is shown flashing on and off in the display and by means of a clicking noise on the gearshift lever. At the same time the warning buzzer sounds.

If the clutch is disengaged again within 2 s without the gearshift lever or the half-gear rocker switch being operated, the gear most suited for the particular operating state is automatically engaged.

The gear selection can be performed by the electronics of the gear control (matched to the momentary operating state of the vehicle), or manually by the driver.

-----------------------------------------------------------------------------------------

Gear selection by electronics of gear control:

The driver determines the shift direction by operating the gearshift lever. The electronics determines the suitable gear for the selected shift direction on the basis of the momentary operating conditions.

Driving on-road:

- Gearshift lever to front = Upshift (min.  gear).

- Gearshift lever to rear = Downshift (min.  gear).

If differential locks engaged (construction site operation):

- Gearshift lever to front = Upshift (max. 1st gear).

- Gearshift lever to rear = Downshift (min. 1st gear).

 The transmission shifts only in the selected shift direction.

Shift facilities:

 Shifting without gear preselection

- Disengaging clutch.

- Move gearshift lever into the desired shift direction until a resistance is felt and hold with a slight pressure. It is only possible to remove the gearshift lever further after the shift has been completed. At the same time the gear stage engaged is shown in the display.

- Engaging clutch.

-----------------------------------------------------------------------------------------

 Shifting with gear preselection:

- Move gearshift lever into the shift direction until a resistance is felt and release.

- The gear stage which is preselected in this way remains stored for about 10 s (for about 30 s in the case of construction site operation) and is shown as a flashing indication in the display.

During the preselection time

- the preselected gear stage is automatically matched to the altered driving situation.

- it is possible to alter the gear stage.

- it is possible to cancel the preselection.

- Disengaging clutch.

The completed shift is shown in the display.

- Engaging clutch.

-----------------------------------------------------------------------------------------

Gear selection by driver:

The driver determines the shift direction and the gear stage by operating the gearshift lever and the skip-shift button or the half-gear rocker switch.

Upshift (maximum 2 gears):

- By  gear = Pull half-gear rocker switch upwards once.

- By 1 gear = Press and hold function key, then pull gearshift lever forwards or pull half-gear rocker switch up twice (with preselection).

- By 1 gears= Press and hold function key, then pull gearshift lever up and gearshift lever to front or pull half-gear rocker switch up three times (with preselection).

- By 2 gears = Press and hold function key, then pull gearshift lever forwards twice or pull half-gear rocker switch up four times (with preselection).

 If differential locks engaged (construction site operation)

it is possible to shift up by not more than 1 gear.

-----------------------------------------------------------------------------------------

Downshift:

- By  gear = Push half-gear rocker switch down once.

- By 1 gear = Press and hold function key, then pull gearshift lever to rear or push half-gear rocker switch down (with preselection).

- By 1 gears = Press and hold function key, push half-gear rocker switch downwards and push gearshift lever to rear or push half-gear rocker switch down three times in succession (with preselection).

 It is also possible to shift more than 1 gears.

The warning buzzer sounds if the selected gear stage is too low and the engine would overrev. A downshift is performed into a gear stage which is still permissible.

-----------------------------------------------------------------------------------------

Shift facilities:

Shifting without gear preselection (only  or 1 gear possible)

- Disengaging clutch.

- Move gearshift lever into the desired shift direction until a resistance is felt and hold with a slight pressure. It is only possible to remove the gearshift lever further after the shift has been completed. At the same time the gear stage engaged is shown in the display.

- Engaging clutch.

Shifting with gear preselection

- Move gearshift lever into the shift direction until a resistance is felt and release.

- The gear stage which is preselected in this way remains stored for about 10 s (for about 30 s in the case of construction site operation) and is shown as a flashing indication in the display.

- During the preselection time the programmed gear stage may be changed and the preselection deleted.

- Disengaging clutch.

The completed shift is shown in the display.

- Engaging clutch.

 Transmission neutral position "N" and reverse gear cannot be preselected.

Emergency shift:

When the emergency switch in the GS/EPS shift control unit (A15) is operated, the matching gear, gate or range solenoid valves are actuated. This results in air being admitted to the relevant working cylinders thus shifting the gears.

When in emergency shift mode only 2nd. gear, 5th. gear, neutral and the reverse gear are available. It is possible to shift from 2nd gear into 5th gear when driving. The other gears can only be shifted when the vehicle is stationary and the engine running.