Challenger Techstar CVT MT525B Series, Operators Instruction Book, Page: 155 / 248

7 . ACCESSORIES AND OPTIONS
7.17 Challenger MT500B EU
7
7.3.5 - Working operation
(Fig. 18, Fig. 19)
In the
"furrow start" phase, the front plough share pene-
trates into the earth and the rear depth wheel initiates a
partial lowering (ref. K, set to L, Fig. 16).
When the last share reaches the ground, the rear depth
wheel is lowered to its
working position ref. 23.
Windows 16 and 17 (Fig. 19) indicate the plough length cor-
rection applicable to the next furrow starts or ends.
To change the values, select the window using keys 6-1 or
6-2 and adjust knob 14.
E.g.: Field start correction (- 0) (straight headland furrow).
Field end correction (+ 15) (point headland furrow).
The (+/-) values are inverted at each end of the field after
the plough is lifted (on the headland furrow).
In the working position, windows 16 and 17 are displayed
automatically at the end of the field.
NOTE: If the field is rectangular, the correction values in
windows 16 and 17 must be set to "0".
7.4 - GLOSSARY
Working mode:
When the "Dual Control" is switched to this mode, the
plough depth wheel repeats the lifting movements, com-
plying with the amplitude and the phase of the lifting move-
ments.
The depth wheel position can be corrected by operating
the manual control of the spool valve.
Furrow start mode:
When a transport/work transition is made, the system
switches to partial lowering mode.
The following steps are carried out: Lowering of the linkage
and
partial lowering of the plough depth wheel to the
stored partial lowering setting value.
The lowering of the linkage continues; the plough depth
wheel height does not change as long as the equivalent
distance covered by the tractor (first to last share) is less
than the set and stored value called
Furrow start plough
length .
Furrow end mode:
When a work/transport transition is made, the system
switches to partial lifting mode.
The following steps are carried out: Lifting of the linkage
and
partial lifting of the plough depth wheel to the stored
partial lifting setting value.
The lifting of the linkage continues; the plough depth wheel
height does not change as long as the equivalent distance
covered by the tractor (first to last share) is less than the
set and stored value called
“Furrow end plough length” .
Headland furrow mode:
The linkage is raised to maximum high position. (value de-
termined by the high position potentiometer) and the
plough
depth wheel is in the stored high position .
Plough length:
This is representative of a "distance value" from the tractor
rear wheel axle to the plough depth wheel axle.
This setting determines the partial lowering and lifting tim-
ing for the plough depth wheel.
Optimum setting:
Setting obtained from the plough length values which pro-
vide best penetration into the earth of first and last share
on a same furrow start line (X. Fig. 18).
Fig. 19
16
17
2 1
6
14