Great Plains YP4025F-1670 Operator Manual - Manual (Page 65)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 61
2014-09-08 Table of Contents Index 401-571M
Marker Disk Adjustment
Sharp Object Hazard:
Marker disks may be sharp. Use caution when making
adjustments in this area.
Refer to Figure 63
1. To change angle of cut, and the width of the mark,
loosen
1 ⁄
2
inch bolts holding the disk assembly.
For a wider mark , increase the angle of the
marker with respect to the tube . For a narrower
mark , reduce the angle.
Note: 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 .
Note: The direction of travel tends to drive the disk
angle to Wide. If bolts are not tight enough, or
loosen over time, the disk will slip into the Wide
mark configuration.
Fan Adjustments
Refer to Figure 64
There is one butterfly valve at the fan outlet:
The recommended butterfly valve setting is 0
°
.
Recommended fan speed depends on planter
configuration:
Adjust the basic fan rate with the tractor hydraulic system
and the fan rpm display of the seed monitor. Do not run
the fan at speeds over 4500 rpm or speeds under
3000 rpm.
A fan operating at too high a speed creates too much air
flow causing seed to plug up the meter box, and meters
to run empty. A fan operating too slowly does not create
enough air flow to push the seed to the meter, causing
meters to run empty. If air system does not operate
suitably with fan speeds between 3000-4500 rpm, refer
to the troubleshooting chart, and then adjust the fan
butterfly valve only as needed.
Normally, each seed meter will be full of seed, up to the
top of the bypass screen at the base of the inlet neck. If
the meter has less seed, check for blockage upstream. If
there is no blockage, check for insufficient fan airflow: low
rpm and/or butterfly valve at too high an angle.
The butterfly valve may be helpful if your tractor can
maintain a high, but irregular fan rpm. Set the rpm to
above 3800 rpm with valve
completely open (0
°
).
Adjust valve angle in the 20-30 ° range until you achieve
the desired seed flow consistency.
3800 rpm 82 bu. hopper
150 bu. hopper
670/1440 liter seed/fertilizer hopper
a
a. See manual 403-362M for operation with this
hopper.
3500 rpm bulk seed boxes
Figure 63
Marker Disk Angle
11757
T
2
1
N
W T
2
W
1
N
2
T
Figure 64
Fan Butterfly Valve
29313
1
1
1