Great Plains PH-20 Operator Manual - Manual (Page 31)

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Section 3 Adjustments
12/29/2011 PH-15, PH-20, PFH-15 and PFH-20 Precision Fertilizer Hitch 148-365M
Great Plains Mfg., Inc.
Pivot Lock Adjustment
To adjust the gap on pivot-locks, loosen jam nut (1) and
screw bolt (2) in or out to desired setting, then retighten
jam nut. When pivot frame is 90 degrees to tongue, bolt
head should be about 1/16 inch (0.16 centimeter) away
from hitch frame.
Figure 3-21
Pivot Lock Tube Adjustment
If the pivot locks do not automatically unlock in field posi-
tion, or lock in field position, check for binding in the locks,
and confirm that both sides have the 1/16 inch gap dis-
cussed above.
18146
1
2
adjusted properly.
Figure 3-22
18121
Leaf Spring Adjustment
A leaf spring is located just ahead of the vertical pivot. See
Figure 3-22 Leaf Spring AdjustmentFigure 3-22. 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 conditions. Proper leaf-
spring adjustment is important for smooth implement
operation.
To adjust properly, refer to . 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 roller pads (3)
on transport frame. Make sure both right and left sides are