Great Plains YP1220 Operator Manual - Manual (Page 67)

Great Plains Manufacturing, Inc. Maintenance and Lubrication 63
03/14/2012 401-506M
Marker Maintenance
Refer to Figure 74
The marker arm is attached to the marker body with a
1 ⁄
2
-13 x 2 1 ⁄
2
in Grade 5 shear bolt. If shear bolt breaks,
replace it with a Great Plains part 802-130C or equiva-
lent.
Note: Replacing shear bolt with a higher grade bolt can
cause marker damage. Replacing it with a lower
grade can result in nuisance shears.
Note: If an identical Grade 5 bolt is not immediately avail-
able, temporarily substitute a metric M12x1 6.4mm
or longer Class 8.8 bolt and nut.
If grease seal cap for marker-disk-hub bearings is dam-
aged or missing, disassemble and clean hub. Repack
with grease and install new seal or grease cap.
Figure 74
Marker Shear Bolt
21962