Great Plains CPH-20 Operator Manual - Manual (Page 16)

14
Section 3 Adjustments
CPH Center Pivot Hitch 148-152M 12/29/2011
Great Plains Mfg., Inc.
Coulter Mounting Height
You can change the depth of individual coulters by adjust-
ing coulter-mounting height. If you adjust coulter height,
be sure to rebolt coulters vertically straight and correctly
spaced. To raise or lower individual coulters:
1. Loosen mounting clamps and adjust coulter to desired
height. Do not lower coulter spring bar below top u-
bolts on coulter clamp.
2. To retighten clamps, refer to Figure 3-3. Snug hex-
head clamp bolts (1) just until u-bolts are tight on each
side of spring bar.
3. Tighten nuts (2) on u-bolts.
4. Finish tightening hex-head clamp bolts.
Figure 3-3
Individual Coulter Mounting
NOTE: Even when coulter is held securely, there may be a
gap between clamp halves.
Lock Plate
Set lock plate to match your field conditions. Lock plate is
located at rear of level link.
No-Till, Hard and Dry Soil
For maximum opener penetration, operate drill and hitch
in rigid position. See Figure 3-4. The rigid position is the
most common position for no-till seeding and is effective
for a wide range of field conditions. Lock plate down over
top link pin.
Figure 3-4
Link in Rigid Position
Minimum Till, Average Soil with Hills and Terraces
For softer soils that have been tilled lightly and for drilling
over hills, contours, ditches or terraces, operate drill in lim-
ited-float position. See Figure 3-5. Leave lock plate un-
locked and adjust level link so top link pin is at back of slot.
(Refer to Level Link Adjustment, page 15.) The limited-
float position allows hitch and drill to flex when traveling
over contours but transfers enough weight to drill for open-
er penetration in softer soils.
Figure 3-5
Link in Limited-Float Position
Conventional Tillage, Very Soft Soils
For maximum flotation over hills and contours in soft soils,
operate drill and hitch in maximum-float position. See Fig-
ure 3-6. Leave lock plate unlocked and adjust level link so
top link pin is in center of slot. (Refer to Level Link Adjust-
ment, page 15.) In maximum-float position, drill tips for-
ward and back independent of hitch.
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