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3P3025AH
Adjustments
Great Plains
| 411-332M | 2019-02-19
55
Fine-Tuning Meter Pressurization
If, after several passes you are comfortable with the
planter’s operation, you can optimize meter
pressurization. Use this method during longer passes, so
there are fewer distractions (and see sidebar regarding
Milo).
1. Observe the current overall average population
reported by the planter monitor.
2. Adjust the fan speed down, in small steps, waiting
5-10 seconds between adjustments, until skips occur
(actual population begins falling below target). Note
the pressure at which skips begin.
3. Restore pressure to the initial value at step 1.
4. Adjust the fan speed up, by periodic small
increments, until doubles occur (actual population
begins rising above target). Note the pressure at
which doubles begin.
5. Adjust Meter pressurization to a value halfway
between the limits established at step 2 and step 4.
This is the ideal value for your crop, disc and
population, providing equal margin against skips and
doubles. Record this value for future use.
Fan Speed Switch Adjustment
Refer to Figure 53 and Figure 54
A fan speed switch is located in the fan
. The fan
speed switch counts the revolutions of the three
mounting screws in the fan.
To adjust the fan speed switch:
1. 1. Park the planter on a flat level surface. Apply the
tractor parking brake. Stop the engine and take the
key with you.
Alternate Skip/Double Check
Small seeds, particularly Milo, are less reliably sensed as
skips or doubles by the seed tube sensors, and watching
planter monitor population is unlikely to locate the
pressure limits. This test can also be quicker for all
seeds.
A. After planting a few passes with initial settings,
remove the rain covers from several rows (use rows
with a variety of seed hose lengths and routes).
B. Make a meter pressurization adjustment. Resume
planting for a pass or less.
C. Stop planter motion but leave engine at field rpm and
fan running.
D. Inspect the seed discs closely. Look for empty seed
cells (skips) and cells with multiple seeds (doubles).
E. Repeat step B-to-step D until limits are established.
Record limits. Re-install rain covers. Plant with
Figure 53
Fan Location
38339
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