Great Plains P18046B Operator Manual - Manual (Page 27)

27 Double Press
Operating Instructions
4. Adjustment / Operation
4.5 Pitch Control
Pitch control on the Double Press is
governed by the quantity of shims fitted to
the drawbar cylinder. Increasing the number
of shims will lift the front of the chassis when
lowered into the work position.
Running the Double Press level allows the
press rings to give an even consolidation
and clod crushing action.
Running the machine significantly nose
down or raised will reduce the load on the
rear axle leading to loss of drive of the axle
and then blockage, together with a reduced
consolidation effect.
If any roll axle starts to block regularly, this
is generally an indication that the roll axle
is not tight. Failure to keep the axles tight
results in loss of drive between each pair of
rings allowing rings to turn individually on
the axle. Should this occur the axle must
be tightened immediately to prevent any
damage occurring to the axle shaft.
If the roll axles start to block regularly this
may also be an indication that the ground
conditions are too wet for the Double Press
to be effective.
In practice it is possible to use the Double
Press on ground conditions that are unsuit-
able to achieve the desired effect, and it
is usually possible to operate the machine
without regular blockage under such unsuit-
able conditions, assuming that the axles are
tight and rings smooth.
As such, especially under wet conditions, it
is advisable to check on the cultivation effect
of the Double Press. Often the use of the
press 12 - 24 hours after the disc or longer
following the plough gives a far superior
surface consolidation effect.
It is not necessary to tilt the Double Press
onto the transport wheels during headland
turns whether the machine is used inde-
pendently or in tandem with a disc cultivator.
Fully extending the drawbar
cylinder and then reversing into
the headland furrow could lead to
damage of the cylinder.