Clip Control (Option); Calibrating Drive - Valtra 6000 Workshop Manual

32. ACD electro---hydraulic power lift
E. Clip control (option) (not on ACB)
(on E ---models as standard)
In the draft control mode the ACD ---power lift uses the
mutual relation of the draft control and the slip per cent
when adjusting the working depth. The slip is determined
with a speed difference between the transmission speed
and the radar speed.
Note! Before the slip control functions, the radar signal and
the transmission speed sensor signal should be calibrated.
The calibrating drive ensures, that the ACD control unit
"knows" the mutual relation of both these signals in an non-
slip situation. When the wheels slip, the signals have differ-
ent speeds, which the ACD recognises and makes a lifting
reaction.
Transmission signal frequency depends on the tractor
model and the wheel rolling radius. For this reason, the
ACD has an automatically functioning calibrating default
value.

Calibrating drive:

--- Activate the ACD
--- Attach load to the three point linkage, which assures that
the calibrating occurs in the working condition.
--- Drive the tractor on an firm surface.
With the lift/lower switch in the transport position: the driv-
ing speed should be greater than 15 km/h.
In the most difficult situation, the ACD requires a calibrating
drive of 12 minutes after the first activation, to validate a
correct transmission calibrating value. One term is that the
radar signal is in order.
When the ACD is activated the first time, it has in the mem-
ory a calibrating value, which corresponds to the trans-
mission frequency signal of 55 Hz / km/h. This default
value is corrected continuously during the calibration drive,
when the above mentioned terms are fulfilled.
The first calibration is carried out in the factory. If the ACD
control unit is changed, a new calibrating drive must be
done.
15. 5. 1996
1. 11. 1998
Functional check
--- disengage the diff. lock and the 4WD
--- raise the RH side rear wheel
--- activate the ACD and adjust the lower links to the work-
ing position, in which they follow accurately the position
control potentiometer.
--- turn the draft control selector to position 6
--- switch on the slip control
--- start driving carefully (e.g. with gear M1). The raised rear
wheel rotation can be slowed up with aid of the clutch
pedal
--- the lower links must raise when a "slip effect" has been
produced
--- declutch (the rear wheel stops). The lower links should
lower almost to the original position
--- turn the slip control selector to the OFF ---position. Now
the rotation of the RH side rear wheel must not cause a
lifting reaction.
Important! Fault code 35 indicates, that there are malfunc-
tions in the slip control selector. Fault code 41 indicates prob-
lems in the radar (only in the draft control mode) and fault
code 42 indicates problems in the transmission speed sensor
(only in the draft control mode). Checking the slip control
selector, see instruction F.
Radar --- You are not allowed to go under the tractor
which has radar (slip control models) before the current
switch has been turned off. --- dangerous for eyes.
310
Model Code
8450-- 8750
321
Page
6