Great Plains P18651C Operator Manual - Manual (Page 21)

21 SL700
Operating Instructions
The Simba Great Plains SL700 is an
amalgamation of time proven, successful
Simba 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