All-wheel drive

Drive

40001296.00-en

The grader is equipped with a drive acting on all four wheels of the rear axle (tandem axle).

All-wheel drive

A front-wheel drive can be switched on in addition to the rear-wheel drive.

Front-wheel drive

The front-wheel drive is switched on and off using the button (41, Fig. 6) and only becomes active when a gear is engaged.

Fig. 6

Activating the front-wheel drive

Switch 41 (Fig. 6) Press the pushbutton with the symbol – the symbol lights up Front-wheel drive is active.

Deactivating the front-wheel drive

Switch 41 (Fig. 6) Press the pushbutton without the symbol – the symbol does not lights up Front-wheel drive is not active.

It is possible to switch it on or off in any operating condition. This is done as follows: - When the machine is stationary and in gear - When the travelling speed is less than 2 km/h When the front-wheel drive is on, the powershift transmission cannot be used in 6th gear. When the 6th gear is engaged, the front-wheel drive is not engaged. A microprocessor monitors the front-wheel drive and adapts it to the rear-wheel drive. When the front-wheel drive is off, the front wheels turn freely.

If the hydraulic pump of the frontwheel drive is defective and therefore no longer driven, the machine must be parked. The machine can then no longer be driven, even if the front-wheel drive is off. Locate and rectify the cause of the malfunction. Front-wheel drive, speed levels

For adapting the front-wheel drive to the working conditions, the speed of the front wheels can be varied in eight levels with respect to the speed of the rear wheels. The speed levels are selected by the rotary switch (84, Fig. 7). Position 0 = Front and rear wheels have the same speed Positions 1 to 5 = Front wheels have higher speed (lead) Front-axle traction force is increased. Positions -1 and -2 = Front wheels have lower speed (lag) Front-axle traction force is reduced.

Fig. 7

Gearshift lever – powershift transmission

40001297.00en

Never allow the machine to roll with the gear lever in neutral position, e.g. when driving downhill.

Forward and reverse travel and the six forward and three reverse gears are selected with the gearshift lever (82, Fig. 1).

Fig. 1 All gears can be shifted under load. The electronic transmission only shifts within the speed ranges of the individual gears.

Fig. 2 The control can be switched with rocker switch (88, Fig. 2) optionally into the manual or into the automatic mode.

Automatic mode:

Set rocker switch (88, Fig. 2) to automatic mode. After starting of the engine, the transmission is in the automatic-mode neutral position. • Preselection of gears: - Engine speed below 1,500 RPM - Releasing the parking brake - Press the button on the gearshift lever (82,

Fig. 1) and shift the lever forwards into forward gear or backwards into reverse gear.

Release the button. - The automatic transmission now shifts into 2nd forward or 1st reverse gear. Only if required by the driving situation, for instance setting off under load, will the gear control automatically shift down into 1st gear. - Depending on the speed range, the automatic transmission then either shifts up into 6th forward gear or down into 3rd reverse gear.

Ending automatic mode and shifting manually

Fig. 3 The automatic mode is ended by setting rocker switch (88, Fig. 3) to manual position. The transmission retains the gear actually fixed by the automatic gearshift. The automatic mode can also be ended by moving the gearshift slightly sideways. The transmission shifts into the next higher or lower gear. Thereafter, the machine can be shifted manually down into next lower gears by moving the gearshift lever slightly to the left. By moving the gearshift lever slightly to the right, the machine can be shifted into the next higher gear. The gearbox returns to the automatic mode if either the button on the gearshift lever is pressed briefly or the gearshift lever is moved through the N position.

Forwards-reverse shifting

Before forwards-reverse shifting (reversing), reduce the engine speed. There is a risk of accident due to reversing at higher travelling speeds.

Shifting from forward gears into reverse gears (reversing) is also possible while moving. The machine is braked smoothly and, after stopping, sets off again in opposite direction. • Reduce the engine speed before reversing the travel direction. • Shift into the opposite travel direction.