Great Plains Simba Single Press Operator Manual - Manual (Page 24)

24 Simba Single Press
609-060M-ENG
2013-01-25
4. Adjustment / Operation
4.6 Pitch Control
Pitch control on the Single 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 Simba Single 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 Single Press
to be effective.
In practice it is possible to use the Single
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 Single Press. Often the use of
the press 12 - 24 hours after a disc cultivator
(or longer following a plough) gives a far
superior surface consolidation effect.
It is not necessary to tilt the Single 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.
4.5 Work Settings
In work the wing cylinders should be fully
extended. The gangs are able to float over
any undulations on the ground due to the
accumulators in the hydraulic system.
Optimum performance has been found
to be achieved 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 blockage may
occur, this will reduce when the rings are
shiny again.
The Single Press should be run with the
chassis level front to rear by extending the
drawbar cylinder to the necessary position.
The cylinder should not be over extended
as this will remove the load on the rings
which could lead to reduced drive and hence
blockage of the axles.
It is not necessary to tilt the Single Press onto
the transport wheels during headland turns
whether the machine is used independently
or in tandem with a disc cultivator. Normally,
the Single Press should be tilted onto the
roll to a point where the rear axle wheels
are clear of ground contact.
Shims should be added to the levelling board
cylinders until the levelling boards are car-
rying soil. The levelling boards will need to
be set higher during 1st pass operations
especially on ploughed land where large
clods may not be able to pass under or be-
tween the sprung leaves. The boards need
to carry a certain amount of soil to effect a
levelling operation and also to give a clod
to clod crushing action.