Great Plains HD Series Operator Manual - Manual (Page 9)

9
Tooth Angle Adjustment –
The teeth can be pulled at either a 40 or 22 degree (back from vertical) angle depending upon the
aggressiveness and soil stirring action needed. If the harrow is pulled with the long side of the
restrictor bracket toward the front of the harrow, it is set at 40 degrees back of vertical (flatter
and most commonly used tooth angle – factory setting). If the short side of the restrictor bracket
is to the front of the harrow, the setting is 22 degrees back of vertical (straighter up and down –
more aggressive). To change the setting, the harrow sections must be unhooked from the frame,
reattached and pulled from the other end of the section. Harrows come from the factory set at 40
degrees and most people use them that way in most conditions.
In most conditions the 40 degree setting (flatter) is preferred. It will give a
better seedbed and will flow residue more easily.
If you use the harrow in the 22 degree setting, you must slow down to 4 ½
mph. The aggressiveness of the tooth in the straighter up and down position is
much harder on the machine and the section will hop if the speed is too fast.
Residue flow will be much better in dry conditions. Wet residue has a
tendency to ball up.
40
22