Great Plains P14889 Serial No 18007975 - Manual (Page 22)

Simba SL
Operating Instructions
22
4. Adjustment / Operation
Fig. 4.04: Front Disc Gang
4.2 Disc Units
The SL features two rows of discs which chop
and mix the crop residue. A disc spacing of
250mm ensures a fine tilth.
The discs fitted to the SL are 500mm in
diameter (20") and 6mm thick. They are
manufactured from heat treated chrome
boron steel which ensures excellent wear
resistance and enhanced working life. Each
disc is mounted on a Pro-Flex sprung leaf
linked to a track rod system. Gang angles
can be varied with ease and accuracy using
a graduated adjuster.
Adjustable angling of the discs (between 10°-
25°) ensures penetration and stubble mixing
are achieved in one pass. All this is achieved
without compromise to consolidation.
A level, evenly cultivated finish is maintained
by adjusting the balance of soil throw between
the front and rear disc.
Sprung Pro-Flex leaves offer protection
against damage as well as offering a degree
of contour following as they flex up and down
in work.
4.3 Terra-Grip Tines
Terra-Grip tines have a robust, basic
construction and are suitable for all soil types.
The spring-loaded auto-reset system with a
500kg trip force on each tine prevents
damage to the tines and tine brackets.
When the auto reset system is activated an
initial progressive phase holds the tine in the
ground in a steady position until the trip point
is reached. In the subsequent spring
compression phase the tine is raised gently
and rapidly to a maxmum height of 230mm.
The tines can be fitted with a selection of points
depending on application and have 6 depth
settings in 25mm increments down to a
maximum working depth of 250mm..
Fig. 4.05: Terra-Grip Tines