Great Plains 2SF30 Operator Manual - Manual (Page 61)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 57
2014-01-09 Table of Contents Index 155-015M-A
Marker Maintenance (Option)
Marker Shear Bolt Replacement
Refer to Figure 44
If a marker gets caught or hits an obstruction, it is
designed to fail a shear bolt
at the fold, pivot on a
second bolt (not visible in Figure), and swing back.
The shear bolt is a hex head cap screw,
5 ⁄
16
-18
× 1 1 ⁄
2
inch Grade 5,
Great Plains part number 802-012C, plus a
5 ⁄
16
-18 lock nut, Great Plains part number 803-011C.
Note: If an exact replacement is not immediately
available, temporarily substitute an
M8
×1.25 Class 8.8 bolt and nut.
Install a replacement shear bolt on the vertical face on
the side opposite from the pivot bolt. Do not use a higher
grade bolt, or marker hang-ups may result in machine
damage. Do not use a lower grade bolt, or you may
experience nuisance shears.
Marker Grease Seal Cap
If grease seal cap for marker-disk-hub bearings is
damaged or missing, disassemble and clean hub.
Repack with grease and install new seal or grease cap.
3
4
Figure 44
Marker Shear Bolt
34718
3
3
4