Great Plains YP825A3P Operator Manual - Manual (Page 85)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 81
2013-05-28 Table of Contents Index 401-652M
Marker Maintenance (Option)
See also:
“Initial Marker Setup (Option)” on page 113,
“Marker Operation (Option) S/N-” on page 33, and
“Marker Disk Adjustment” on page 42
Marker Shear Bolt Replacement
Refer to Figure 88
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.
Figure 88
Marker Shear Bolt
29982
2
1
3
1
2
3
3