Great Plains 2525P Operator Manual - Manual (Page 29)

Great Plains Manufacturing, Inc. Adjustments 25
2013-05-10 118-231M
Marker Adjustments
Pinch, Crush and Sharp Object Hazards:
You may be injured if hit by a folding or unfolding marker.
Markers may fall quickly and unexpectedly if the hydraulics
fail. Never allow anyone near the drill when folding or
unfolding the markers.
There are four operating adjustments for markers:
• Marker Width
Once set for a specific row spacing, this only needs
periodic checking to ensure the clamp is secure.
• Disk Angle
Even if your row spacing rarely changes, you may
need to adjust disk angle for soil conditions and plant-
ing speed.
• Chain Length
You may want to adjust the chain length to ensure the
markers track uneven ground, and/or are off the
ground when the drill is raised.
• Marker Speed
Once initially set by your dealer, this rarely needs
modification.
There are also three maintenance items for markers:
• “Marker Cylinder Bleeding” on page 56.
• “Marker Shear Bolt Replacement” on page 57.
• “Marker Transport Carrier” on page 57.
Marker Width
Marker extension depends on drill size, row unit spacing
and row units in use.
See “Marker Extension” on page 79 for initial values for
marker extension.
Refer to Figure 17
To adjust marker width, loosen jam nuts
and 1 ⁄
2
in set
screws . Move marker disk tube in or out to get the
proper dimension.
Refer to Figure 89 through Figure 138 beginning on page 79.
The diagrams shows marker width for the different
opener spacings and opener configurations.
To measure for marker width adjustment:
1. Lower drill in the field and drive forward a few feet.
2. Measure from the centerline of the outside active
row unit (not pair) to the mark in the ground made by
the marker disk.
Note: Extension for left and right sides may not be identi-
cal in some drill configurations.
Figure 17
Marker Extension Adjustment
19204
1
2