John Shearer Pasture Renovation Drill Operator's Manual page 15

02.19M143J1
TYNE SPRING TENSION
Set tyne spring tensions equally on each row.
Tynes on the front two rows are more likely to need tension. To
avoid higher loads than necessary on the tyne assembly
components, use the minimum spring tension that will achieve the
penetration required.
PASTURE DISC DRILL – SINGLE DISC
PENETRATION OF DISCS
Where you are unable to gain enough penetration with the discs
due to hard conditions, more pressure can be obtained by
compressing the springs on the pressure rods.
BREAST SET ON DISCS
The set of the disc may be altered by fitting or removing breast
adjustment spacers (item 18, page 43) between the arm and the
drill boot.
Spacers fitted between the arm and the front hole of the disc boot
gives a 50mm set to the disc and to the back hole gives a 70mm
set. Spacers taken out altogether give a 60mm set to the disc.
Increasing breast angle of disc aids trash or clod clearance, but
reduces penetration.
The breast cut of the discs is adjustable to vary the width of the
sowing slot.
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