Great Plains P17921E Operator Manual - Manual (Page 25)

25 UniPress
Operating Instructions
4. Adjustment / Operation
4.2 Pro-Active (Sprung)
Tines
The Pro-Active tines are designed to move
soil and shatter clods to a greater degree
than traditional rigid leading tines. The
ability to move in all directions (upwards and
sideways) allows them to clear stones and
other obstructions. They feature simple,
pinned tine depth adjustment for easy depth
variation.
Fig. 4.02: Pro-Active (Sprung) Tines
4.3 Levelling Boards
The action of the sprung leaf type levelling
boards is to carry and drop soil to level in
front of the press rings, to rub clod against
clod for additional soil breakdown, to force
clods down into the soil profile and to present
remaining clods passing between the leaves
into the row of press rings.
Fig. 4.03: Levelling Boards