390
Model Code Page
35. Autocontrol IV
1. 1. 1994
6600E
8100E-- 8750E
350 6
Differences between Autocontrol III and IV
--- The front wheel steering angle sensor is different to Auto-
control III.
--- The gearbox speed sensor is fitted on the RH side of the
reverse shuttle and it measures gearbox rotation speed
from the gearwheel of the 4WD clutch drum (not an
impulse disc as on AC III).
--- The front axle speed sensor measures the rotation speed
of the 4WD output shaft. There is an impulse plate fitted
between the two output shaft nuts. On the side of the
impulse plate there are holes for possible running
recorder (tachograph) which must be ordered separately.
Central processing unit ECS
The ECS is fitted in thesame placeason ACIII. Thecentral
unit of the AC IV is different as on AC III but its appearance
and size is the same. The AC IV ECS has a sticker with
marking ”Autocontrol 4 Control Unit”, order no 32884200.
Other markings, see page 353/2.
Parameter files:
Autocontrol IV parameter files are different compared with
AC III, see page 343/2 (AC III) and 353/2 (AC IV). AC III
parameter files must not be used. The parameter file is
input into the ECS in the same way as on AC III (see under
code 353) but the Service Program is different.
Delta Powershift control
The greatest difference is the automatic control of the
Delta powershift. AC IV has a 2---position rocker switch
with which can be selected either manual or automatic
control of the gear. In the manual mode the gear ratio is
changed with the push buttons in the speed gear lever
knob.
On AC IV the Delta Powershift control unit A10, indicator
light panel A9 and buzzer B1 are the same as on Autocon-
trol II, see pages 311/3 ---6.
Intheautomaticmode,ACIVengagesthebestpossiblegear
ratio according to the loading conditions. When changing the
gear, ECS sends a current signal to the control unit A10 to the
same pins as the push buttons in the manual mode. The con-
trol unit A10 then sends output signals to the gear solenoids
and indicator lights for gear changing.
On AC III, the automatic gear change happened according to
the max output or max torque. On AC IV there is only one auto-
matic position and the gear change happens between these
two possibilities and the rocking switch has only one auto-
matic position.
Slip control and the power lift
The slip control is the same as on AC III. The hydraulic power
lift is the same as on AC III but the lift/lower switch has three
positions from the beginning of the year 1994. The middle
position stops the movement of the lower links.
Display unit and switches
The function keys are the same as on AC III but the possible
flow meter calibration has been changed a little. The functions
of the switches below the display unit are different. The 4WD
and diff. lock switcheshave been removed from the gear lever
knobs.
Counting functions (same as on AC II)
The counting functions are checked in the same way as on AC
III, see page 341/7.
Implement functions (same as on AC III)
The implement functions and the rear socket are the same as
on AC III. Possible functional checking is carried out in the
same way as on AC III, see page 352/9 (AC IV).
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