Great Plains P18432A Operator Manual - Manual (Page 22)

SLD
Operating Instructions
22
4. Adjustment / Operation
4.4 Pro-Lift Tines
The arrangement of the toolbars in a ‘V’
frame gives lower draught requirements and
maximises the loosening effect of each tine.
The depth of the subsurface tines can be
altered by moving the tines vertically relative
to disc depth in their respective clamps using
the 4 holes in the leg. Altering the drawbar
and lift circuit depth will also affect subsoiling
depth as well as discing depth.
Different wings are available to suit the soil
conditions and optimise the performance
of the machine.
It is important to set the machine up
correctly in order to achieve an efficient
and worthwhile operation. Although the SLD
can work down to around 350mm (14”) this
does not mean that running at this depth is
always worthwhile, taking time to identify
where there is a problem in the soil profile
and working to the minimum depth required
will save a lot of otherwise wasted fuel and
time. It is also very important not to operate
below the critical depth of the tine, this is
where the tine no longer produces upward
movement of soil and effectively behaves as
a mole plough, therefore not producing the
shattering effect desired.
If the tines are operating below their critical
depth, this is indicated by a reduced
(minimal) heave/shattering effect coupled
with an extremely high draft requirement.
Under these circumstances either reduce
tine depth, increase the front disc depth to
alleviate the problem or change the type of
wings.
Fig. 4.02: Pro-Lift Tines