Great Plains CPH-20 Operator Manual - Manual (Page 17)

15
Section 3 Adjustments
12/29/2011 CPH Center Pivot Hitch 148-152M
Great Plains Mfg., Inc.
Figure 3-6
Link in Maximum-Float Position
Level Link Adjustment
After setting lock plate to position that matches your field
conditions, adjust level link to level drill.
1. With drill box half-full of seed, lower drill and coulters
into field position in the field.
2. Observe drill and hitch from the side. The top of drill
box (1) should be parallel with the ground.
3. If necessary, adjust level link. Refer to Figure 3-7.
Raise drill and hitch, unlock lock plate and unpin level
link (2) from hitch. Loosen jam nut (3) and turn eye bolt
to shorten or lengthen link as necessary.
4. Repin link, lower drill and coulters and recheck top of
drill box. When drill box is parallel with ground, tighten
jam nuts.
Figure 3-7
Leveling Adjustment
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17690
Leaf Spring Adjustment
A leaf spring is located just ahead of the vertical pivot. See
Figure 3-8. The spring is designed to provide just enough
force to keep the hitch square and stable for turning at field
ends and to add stability for drilling in rough field condi-
tions. Proper leaf-spring adjustment is important for
smooth implement operation.
To adjust properly, refer to Figure 3-8. Square tongue with
transport frame and adjust 3/8-inch u-bolts (1) on each
side until leaf-spring rollers (2) just make contact with roll-
er pads (3) on transport frame. Make sure both right and
left sides are adjusted properly.
Figure 3-8
Leaf Spring Adjustment
Pivot Lock Tube Adjustment
To adjust tension on pivot-lock tubes, loosen jam nut and
screw bolt in or out to desired setting and retightening jam
nut. When pivot frame is 90 degrees to tongue, bolt head
should be about 1/16 inch (0.16 centimeter) away from
pivot frame.
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