Great Plains 3S-4010HDF Operator Manual - Manual (Page 78)

74 3S-4010HD and 3S-4010HDF Great Plains Manufacturing, Inc.
196-522M 03/28/2012 E
Marker Shear Bolt Replacement
Refer to Figure 89
The marker arm is attached to marker body with a pivot
bolt
and a shear bolt . A third clamp bolt acts as a
hold-down for the top of the marker shear base.
The shear bolt is designed to fail if the marker tip gets
hung up on an obstacle. This prevents marker damage.
If the shear bolt fails, replace it with a bolt of identical
size and grade, or one of similar strength.
The supplied bolt is Great Plains part:
802-589C HHCS 7/16-14X2 GR5
This is a 7 ⁄
16
-14 x 2in Grade 5 bolt. If an exact replace-
ment is not immediately available, temporarily substitute
a metric bolt, M10x0.75 Class 8.8.
Equipment Damage Risk:
Do not replace the shear bolt with a higher grade bolt, or the
next obstruction may result in marker damage.
Note: Do not replace the shear bolt with a lower grade
bolt, or smaller bolt, or you may experience nui-
sance shears.
If conditions are causing frequent shears, keep spare
bolts in the storage holes of the marker shear base.
Before installing a new shear bolt, tighten the 5 ⁄
8
-11x5in
pivot and clamp bolts ( , ) just until marker shear arm
moves with some resistance when pushed by hand.
Note: Repeat the above bolt adjustment step at the be-
ginning of each season.
Marker Disk
Refer to Figure 90
If grease-seal cap for marker-disk-hub bearings is
damaged or missing, disassemble and clean hub.
Repack with grease and install a new seal or grease cap.
End of <maintenance topics>
FigureSpacer:
Figure 89
Marker Shear Base
22514
1 2
3
1 2 3
2
2
Figure 90
Marker Bearing and Cap
18795
1
1 3
1