Great Plains P16867 Serial No 18009156 - Manual (Page 18)

X-Press Trailing Kit
Operating Instructions
18
3.3 Adjusting Depth
Working depth is controlled using the tractor
linkage and the roll linkage.
Roll depth is controlled using the depth stops
and pins on the roll linkage. Reversing the
depth stop through 180° and refitting gives a
finer depth adjustment.
When the depth has been altered, lower the
machine into work and check operation. If
the depth change has been significant then
other setting could be affected. This could
be chassis pitch (front to rear) and disc angle
for the given depth.
A small amount of cultivation, eg. a 20 metre
run, should be carried out before altering
these settings to check whether they are now
suitable for the cultivation effect required.
These settings should be addressed
immediately to prevent too much work being
carried out.
3.2 Work Settings
The X-Press should be run with the chassis
level to slightly tail low. In practice it is possible
to use the X-Press on ground conditions that
are unsuitable to achieve the desired effect,
and it is usually possible to operate the DD
Light roll without regular blockage under such
unsuitable conditions, assuming that the roll
assemblies are tight, the scrapers correctly
adjusted and rings smooth. As such,
especially under wet conditions, it is advisable
to check on the cultivation effect of the X-
Press.
Optimum performance has been found to be
achieved when the DD Light roll rings have
worn away the painted finish leaving a smooth
shiny surface. When the DD Light rings are
new or rusty, soil may tend to pick up on the
surface and blockage may occur, this will
reduce when the rings are shiny again.
The X-Press should be lifted fully clear of the
ground onto the transport wheels for all
headland turns. Turning with the disc units or
roller on the ground could lead to damage of
these components.
I n work machine will want to normally move to
the left due to the forces acting on the front
and rear gangs. This can be countered by
allowing the machine to be offset from the
tractor centre line by enabling the tractor
linkage to float sideways. This is done by
removing or loosening the linkage sway bars.
If the machine always moves to the left either:
a) reduce the front gang angle to reduce
the forces acting on the front blades
which will move the machine towards
the centre or
b) increase the angle on the rear blades
to increase the forces acting on them.
3. Adjustment / Operation
Fig. 3.02: X-Press with Trailing Kit in work position
The changes must be made with the finished
cultivation in mind. Increasing rear blade
angle could lead to blocking of the blades /
roller in some circumstances.
If the rear roller is not giving enough
consolidation the tractor linkage may be
raised slightly to transfer weight to the roller.
Alternatively, reducing forward speed will
allow the roller more time to consolidate the
ground.
If an optional front cylinder is fitted to the
machine this can be used to alter the front to
rear pitch of the machine.