Great Plains P18140C Operator Manual - Manual (Page 26)

8-10m Press Range
Operating Instructions
26
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 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.
4. Adjustment / Operation