Great Plains 2015 Operator Manual - Manual (Page 20)

2015 Three-Point Soybean Machine 173-088M 4/18/05 18 Great Plains Mfg., Inc.
Section 4 Adjustments
Marker Adjustments
Chain Adjustment
There are two chain adjustments. These adjustments
are interrelated and should be done in the following or-
der. Refer to Figure 3-1.
1. Lifting Slack. Start with the marker unfolded. Back
the full-threaded adjustment bolt (1) down until the
head extends as little as possible. Slowly fold the
marker, observing the motion of the disk. If the disk
slides across the ground more than about a foot be-
fore the chain and linkage lifts it up, the chain is too
long. Shorten the chain by moving the clevis (2) in
one or two links. Check the adjustment by repeating
the folding process.
If the chain is too short when the marker is unfolded,
it will keep the end of the marker from dropping into
field depressions. Correct this condition by moving
the clevis (2) one or two links toward the end of the
chain to make it longer.
2. Folding Slack. After completing the adjustment in
step one, fold the marker. Extend the full-threaded
adjustment bolt (1) until the slack is out of the chain.
Lock the bolt in this position by tightening the nuts (3)
on either side of upright channel (4).
Figure 3-1
Marker Chain Adjustment
Disk Adjustment
The field mark left by the marker disk may be changed
by adjusting angle of cut or direction of cut.
1. Angle of Cut. Refer to Figure 3-2. To change the an-
gle of cut loosen the two 1/2-inch bolts holding the
disk assembly. Rotate the disk assembly as desired.
Figure 3-2
Disk Angle
2. Direction of Cut. The disk may be mounted to
throw dirt in or out for different marks in different soil
conditions. Refer to . To change the direction of cut:
a. Reverse the disk by removing the four lug bolts
on the disk hub. Remount the depth band and
lug bolts.
b. Turn the entire disk assembly by removing the
two 1/2-inch bolts and turning the assembly
one-half turn. Reinstall the 1/2-inch bolts and
set the disk angle as desired.
15669
Shear Bolt
IMPORTANT: To prevent marker damage, the mark-
er arm is attached to the marker body with a 3/8-
inch, grade 2 shear bolt. See Figure 3-1. If it breaks,
you must replace it with a grade 2 bolt. The bolt is
Great Plains part number 802-253C.
11757