Great Plains 2525A Operator Manual - Manual (Page 79)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 75
2013-06-04 Table of Contents Index 118-999M
Marker Maintenance
See also:
“Marker Operation (Option)” on page 28
“Marker Chain Adjustment” on page 99
“Sequenced Dual Marker Speed Adjustment” on
page 98
“Marker Extension” on page 100
“Marker Disk Adjustment” on page 34
“Marker Transport Carrier” on page 99
Marker Shear Bolt
Refer to Figure 80
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
-18x1<numerator>3
⁄
<denominator>4in Grade 2 bolt
(Great Plains 802-253C) or
3 ⁄
16
-18x2in Grade 2 bolt (Great Plains 802-266C).
If that size is not available in your local market, tempo-
rarily substitute an M10x1.5 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 81
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 80
Marker Shear Bolt
15669
1
2 1
2
Figure 81
Marker Bearing and Cap
18795
1
1