GREAT PLAINS 1510HDP, Operator'S Manual

Page: 107 / 135

1525P and 1510HDP Table of Contents Index Maintenance and Lubrication
Great Plains | 118-949M | 2018-07-03 Table of Contents Index 103
Marker Maintenance
See also:
“
Marker Operation (Option) ” on page 22
“ Marker Chain Adjustment ” on page 59
“ Sequenced Dual Marker Speed Adjustment ” on
page 122
“
Marker Extension ” on page 60
“ Marker Disk Adjustment ” on page 56
“ Marker Transport Carrier ” on page 59
Marker Shear Bolt
Refer to Figure 158
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 bolt,
which is one of:
3 
16
-18×1
3 
4
in Grade 2 bolt (Great Plains 802-253C) or
3 
16
-18×2 inch Grade 2 bolt (Great Plains 802-266C).
If that size is not available in your local market,
temporarily substitute an M10×1.5 Class 5.8 metric bolt
and nut.
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
Refer to Figure 159
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 158
Marker Shear Bolt
15669
1
2
1
2
Figure 159
Marker Bearing and Cap
18795
1
1