505
Model Code Page
37. Autocontrol 5.2 (K41107---)
1. 8. 2000
371 3
6250--8950
B. Automatic traction control
An extra rocker switch (Autotraction ON/OFF) has been
fitted in the cab. This switch switches on/off an automatic
function, in which either driving directions (traction) (F, R)
can be engaged and disengaged automatically by using
the gas pedal or the brake pedals depending on the engine
revs and driving speed.
1. The function can be switched on, when:
--- tractor is stationary (i.e. gerabox speed is zero)
--- engine revs lower than 1000 rpm.
--- rocker switch is turned into position ON
--- gas pedal calibration has been done correctly
Note! After engine stop the function must be restarted with
the rocker switch.
When the function has been switched on and the shuttle
lever is in the neutral position, the system is in the stand---
by mode and symbol N is blinking in the display. The seat
switch functions normally during the autotraction control.
2. Automatic traction disengagement happens,
when:
A. the function is switched on, driving direction F or R is
engaged and the tractor is driven with. Now the automatics
observe signal from brake switches (S10, S20). When the
brake pedal/pedals are depressed and the driving speed is
below 10 km/h, the traction is disengaged automaticallly,
or
B. the function is switched on, driving direction F or R is
engaged and when the engine revs drop below 970 rpm. If
the gas pedal is almost in the upper position, the selected
driving direction is disengaged automatically.
If the above given terms (A or B) come true, the selected
driving direction is disengaged automatically and symbol N
is blinking in the display.
3. Automatic traction engagement happens,
when:
--- function is activated and either driving directions (F or R)
is engaged
--- brake pedals are not depressed
--- engine revs greater than 1020 r/min
--- the gas pedal is depressed sufficiently.
The following items affect the autotraction control
:
--- position of rocker switch (Autotraction on/off), d23
--- e n g i n e r e v s , F1.
--- gearbox speed (driving speed), F2
--- brake pedal switches, S10, S20, d24
--- g a s p e d a l p o s i t i o n , A3.
--- clutch pedal position (front/rear), A5/A7.
--- position of shuttle lever (front/rear), d9, d10/ d18, d19.
--- d i r e c t i o n (F, R ) , F4 and F5.
--- parking brake (front/rear), d16/d22
Note! If the traction control is switced off with the rocker
switch during driving, the selected driving direction is disen-
gaged into the neutral position and symbol N in the display
is blinking. After this the control unit does engage neither
direction until the parking brake is activated (driving speed
below 2 km/h) and the driving direction is reselected.
FAULT TRACING:
--- If the AutoTraction has malfunctions, check in the test
mode FII the sensors and switches and wires which affect
the function of the system. Also check the calibration of the
gas pedal.
--- check the gas pedal signal voltage in the test mode FII,
specially when the pedal is up (page 371/9).
Calibrate the gas pedal and check in the test mode, that the
position % is zero when the pedal is up.
--- check the gas pedal position sensor lever and its faste-
ning on the spindle.
--- check, that the engine revs drop clearly below 950 rpm,
when the gas cable is released.
NOTE! When driving with the reverse drive controls (Twin/
Trac), the use of the brake pedal does not disengage the
traction but the traction must be disengaged otherwise (the
rear brake pedal has not a brake light switch, so the control
unit cannot get information, when the pedal is depressed.
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