Yetter 3000 Series Viper II Fertilizer Coulter - Manual (Page 10)

10
OPERATION
VIPER FERTILIZER OPENER
The Viper II single disc fertilizer is designed for use in conventional, minimum and no-till
field conditions. Placement of fertilizer with the single disc fertilizer opener is
recommended at 2”-4” from the row. The opener is designed to hold the blade at a set
angle so the knife and fertilizer tube operate in the shadow of the blade. NEVER locate
the opener to place fertilizer closer than 2”. Maximum operating depth (16” blade - 3-
1/2”)(18” blade – 4-1/2”). Check the fertilizer hose clearance after adjusting opener
depth. Torque the setscrews and jam nuts to 100 ft. lbs.
WARNING: Operating the Viper opener in soils containing many large rocks is not
recommended. The opener’s upper movement limit stop is incapable of supporting the planter
frame weight as the opener rides up over large rocks.
ADJUST KNIFE TO BLADE CONTACT on each opener so the blade will turn by hand
with slight resistance, but will not coast or freewheel. In loose soil the knife adjustment is
critical. If adjustment is not maintained, soil or residue may wedge between knife and
blade, resulting in the blade not turning. Because of blade run out, rotate the blade one
full revolution after adjustment. Re-adjust knife as needed. Never strike the knife with a
heavy object or damage may occur.