Great Plains Simba SL700 Operator Manual - Manual (Page 21)

21 Simba SL700
603-216M-ENG
2013-01-25
The Great Plains SL700 is an amalgamation
of time proven, successful Great Plains
design components brought together to
form this important development. The
SL700 has been designed and produced
to provide a one pass mix with a fissured
layer at disc depth for through drainage
and root access to lower horizons. This
enables rapid drainage and access after
rain, creating a greater effective capacity
for moisture compared to ploughing for the
same effective total depth of cultivation.
In principle, the machine is an offset disc
with Spring reset tines, designed for low
draft, high speed operations. The addition
of a levelling board and rear mounted roll
enables more effective cultivation in one
pass. The leading set of disc blades cultivate
the top horizon, minimising clod formation
and reducing tine loadings and blockage.
This starts the ‘top down’ cultivation process,
retaining weathered tilth in the surface level
for stale seedbed purposes. The tines
follow the disc blades to shatter at depth
retaining the surface intact to work as a stale
seedbed. This eliminates the problem of
‘wet years’ in non-plough based terms. The
key to the SL700’s success is the lower draft
tine point and wing which maintain shatter
across the full width of cultivation. The rear
roll then consolidates the surface, cracks
any clods and firms the soil profile after
the rear gang completes mixing to depth.
The corrugated top and shattered lower
horizons are left fully weatherproof to any
conditions between cultivation and drilling
whilst retaining moisture below the surface
for rapid straw breakdown and optimum
establishment of the next crop.
4.2 Depth Wheels
The depth wheel units support the front of
the machine helping to reduce the load on
the drawbar / rear of tractor in work and
ensuring a level soil finish.
Fig. 4.02: Depth Wheels
4. Adjustment / Operation