Dawn Liquid Fertilizer Applicator
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All Dawn modular tools have mirror opposite assemblies. You should install your units so that half have the linkage on the right and half on the left. Inherent asymmetries in the linkage and support structure could cause the toolbar to drift if all units are the same hand.
If the parallel linkage and support are to the right of the centerline, it is a right hand unit, vice versa for the left. Always determine handedness standing in the operator’s position facing the direction of travel.
To set the depth on the unit, use the screw-adjust mechanism to adjust the distance between the bottom of the coulter blade and the bottom of the gauge wheel. Then adjust pressure in the airbag until the unit runs at depth, without leaving a significant depression from the rubber wheel.
The applicator can run at a maximum of approx. 5 in. deep. You can also adjust the relative distance between the injector tine and the gauge wheel, by bolting into one of three holes on the closer arm.
Coulter Angle of Attack
Another important adjustment to note is toolbar pitch. Even small changes to toolbar levelness can have a significant impact on the action of the coulter. Above you can see how tipping the toolbar forward has the effect of dropping the nose, and increasing the relative angle of attack. Similarly, tipping the toolbar backward decreases the relative angle of attack.
Under most conditions, you will run the toolbar level, however a hydraulic top link can make toolbar pitch adjustments very easy, and slight changes in pitch can make a huge difference in the field.