Great Plains 8-10m Press Range SN 12672+ Operator Manual - Manual (Page 25)

25 8-10m Press Range
Operating Instructions
4. Adjustment / Operation
4.8.1 General Instructions For
All Machine Variations
„ When carrying out a headland turn
reduce forward speed and operate the
tilt hydraulics to ensure all ground
engaging elements are out of work and
clear of the ground with all weight being
carried on the rear roll.
„ Depending on field conditions (type of
soil, surface trash) it is possible to
operate the UniPress, X-Press and
CultiPress with a forward speed up to
9mph (12km/h)
„ X-Press Version only. When levelling
boards are fitted it is not possible to
adjust both the levelling board rake
angle and disc angle whilst moving. It is
only possible through the 6 port divert
valve to operate one system or the other.
4.8 Work Settings
In work the wing cylinders should be fully
extended. A simple pressurized hydraulic
circuit automatically sets itself as the wings
are unfolded.
Optimum performance has been found to be
when the press roll rings have worn away the
painted finish leaving a smooth shiny surface.
When the press roll rings are new or rusty, soil
may tend to pick up on the surface and a
blockage may occur. This will reduce when
the rings are shiny again.
The press should be run with the chassis level
by extending the tilt cylinders to the necessary
position then adjusting the trip switch. NOTE:
to ensure the correct machine pitch is
achieved it is necessary to extend the tilt rams
enough to reset the switch then lower it back
into work again. If this is not done it may
appear that continual switch movement has
not effect.
In practice it is possible to operate the press
on ground conditions that are unsuitable to
achieve the desired effect, and it is usually
possible to operate without regular blockage.
As such, especially under wet conditions, it
is advisable to check on the cultivation effect
of the press.
Generally a forward speed of 5-9 mph (8-
12kph) will achieve optimum results,
maximizing inversion and burial. Speeds in
excess of those stated above will tend to give
a deterioration in the quality of the work. This
may be seen as ridges or troughs across the
work surface due to soil being thrown too far
by the disc/tine elements.
In normal operation the machine should be
drawn on forward on the tilt cylinders until the
limit switch is activated. For this to happen
the power to the solenoid valve must be on
(switch on the side lights). With this system it
is possible to run the tilt cylinder circuit in the
float position. This will allow the implement to
contour follow as the tractor drawbar drops
(e.g.: over the brow of a hill).
General Rules when Setting
the X-Press
„ The lighter the land conditions the less
the disc angle required and the forward
speed can be increased.
„ The wetter the land conditions the less
the disc angle required and the forward
speed will need to be decreased.
„ Heavier land will require more of a disc
angle and a slower forward speed.
„ The more the trash the less the angle
on the discs and forward speed will
have to be decreased.
„ On ploughed land reduce the disc angle
to give a cutting/chopping action.
„ In hard conditions increase the disc
angle to increase penetration.