GREAT PLAINS YP4425A, Operating Manual, Page: 64 / 170

2018-07-30 Table of Contents Index 401-805M
YP4425A Table of Contents Index Adjustments 60
Marker Adjustments
There are three adjustments and two maintenance items
for markers:
•
Disc Angle (following)
Even if your row spacing rarely changes, you may
need to adjust disc angle for soil conditions and
planting speed.
•
Shear Bolt Replacement ( Maintenance , page 105)
If a marker hangs up on an obstruction, a bolt at the
fold is designed to fail.
•
Marker Cylinder Bleed ( Maintenance , page 105)
If marker operation is irregular, check that system is
not contaminated with air.
•
Marker Extension ( Initial Setup , page 154)
Once set for a specific row spacing, this only needs
periodic checking to ensure the clamp is secure.
•
Marker Speed ( Initial Setup , page 154)
Once initially set by your dealer, this rarely needs
modification.
Marker Disc Adjustment
Sharp Object Hazard:
Use caution when making adjustments in this area. Marker
discs may be sharp.
Refer to Figure 67
1. To change angle of cut, and the width of the mark,
loosen
1
/
2
-inch bolts holding the disc assembly.
For a wider mark , increase the angle of the
marker with respect to the tube . For a narrower
mark , reduce the angle.

Do not set a marker angle wider than need to make a
useful mark. Excess angle increases wear on all
marker components.
2. Tighten bolts .

The direction of travel tends to drive the disc angle
to Wide. If bolts are not tight enough, or loosen over
time, the disc will slip into the Wide mark
configuration.
Overhead Sudden Marker Movement Hazard:
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 planter when folding or
unfolding the markers.
Figure 67
Marker Disc Angle
11757
T
2
1
N
W
T
2
W
1
N
2
T