Great Plains 3S-4000HDF Operator Manual - Manual (Page 90)

86 3S-4000HD/HDF Table of Contents Index Great Plains Manufacturing, Inc.
195-067M Table of Contents Index 2013-06-13
Marker Maintenance
Marker Transport Carrier
When marker is folded, the second section should be
centered in transport carrier saddle and be parallel with
top of drill box.
Refer to Figure 99
To adjust height of saddle, loosen
1 ⁄
2
×
2in U-bolts that
hold carrier tube to mounting bracket. Slide carrier tube
up or down as needed.
Marker Shear Bolt
The marker arm is attached to marker body with a shear
bolt
, which is intended to fail if the marker strikes an
obstruction, allowing the marker to swing back around a
second bolt
.
If the shear bolt breaks, replace it with an equivalent
7 ⁄
16
-14
×
2 inch Grade 5 bolt (Great Plains part
802-589C). If that size is not available in your local
market, substitute an M10
×
0.75 Class 8.8 metric bolt
and nut.
If your conditions result in frequent shears, the marker
shear base has storage holes for spare bolts.
Note: Replacing the bolt with a lower grade, or smaller
size, can result in nuisance shears.
Equipment Damage Risk:
Replacing the bolt with a higher grade can result in marker
damage.
Figure 99
Marker Transport Carrier
18961
1
Figure 100
Marker Shear Bolt
23204
1
2
1
2