Wheel System, Traction 202Service Manual – SW4000
Wheel System, Traction
Functional Description
The main components for the drive system are: the driving wheel assembly with integrated disc brake, the
drive pedal, the electronic board, forward/reverse gear switch and the brake pedal with parking brake lever.
The direction of travel is dened by the switch on the dashboard. If the switch is set to reverse, the reverse
gear buzzer starts to sound until the forward gear is not restored.
On the driving wheel there is a disc brake keyed to a reduction unit fast shaft.
The brake pedal activates the disc brake piston with a sheathed cable. The parking brake lever mechanism is
integrated in the brake pedal.
The driving wheel (M0) is powered by the drive system control electronic board (EB1).
The driving wheel is electronically protected by the drive system control electronic board (EB1), which limits
the current supplied at the values set in the relevant parameters (see parameters 19, 20, 21 in Drive System
Electronic Board Parameter Table).
The electronic board power circuit (EB1) is powered through the safety electromagnetic switch (ES0).
The electromagnetic switch (ES0) is activated by the same electronic board (EB1), after the rst check on the
conformity of the input conditions, when it receives the start-up signal by the ignition switch circuit (SW1)
through the relay (K4).
The main control inputs of the electronic board (EB1) are the hall-effect pedal (R1) and the forward/reverse
gear switch (SW2).
Other inputs of the electronic board (EB1) are: the driver’s seat microswitch (SW7) and the lifted hopper sen-
sor (S1) signal. The drive system is inhibited when the microswitch (SW7) does not detect the operator on
the driver’s seat, but when the sensor (S1) detects that the hopper is lifted, the maximum machine speed is
decreased to a safety value (see parameter 12, in Drive System Electronic Board Parameter Table).
Upon start-up (with the ignition switch SW1) or when the driver’s seat microswitch signal (SW7) is inter-
rupted and then restored, the system is always set to forward speed. Pressing the forward/reverse gear switch
(SW2) changes to reverse gear until the switch is pressed again. When the reverse gear is selected, the warn-
ing light on the switch (SW2) and the buzzer (BZ1) turn on.
The position of the drive pedal (R1) determines the machine speed. The safety condition for drive system ac-
tivation is that the drive pedal (R1) is totally released (machine stopped) when the system is turned on (with
the ignition switch SW1).
When the machine is stopped, the output signal for R1 is less than 1V.
When the machine reaches the maximum speed, the output signal for R1 is higher than 5V.
This calibration should be correct for 100% of pedals. Otherwise, if a different pedal calibration is necessary,
perform the following learning procedure for the electronic board:
1. Connect the programmer (9097297000) and enter the potentiometer calibration enabling page
2. Conrm by pressing the MODE key
3. Release the pedal and conrm by pressing the MODE key
4. Press the pedal until the end of stroke (max. speed) and conrm by pressing the MODE key
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