Great Plains YP1625A Operator Manual - Manual (Page 57)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 53
2013-08-13 Table of Contents Index 401-625M
Fine-Tuning Meter Pressurization
After several passes, if you are comfortable with the
planter’s operation, you can optimize meter
pressurization. Do this during longer passes, so there
are fewer distractions (and see sidebar regarding Milo).
16. Observe the current overall average population
reported by the monitor.
17. Adjust the meter pressurization down, in discrete
steps, waiting 5-10 seconds between adjustments,
until skips occur (population begins falling below
target). Note the pressure at which skips begin.
18. Restore pressure to the initial value at step 16.
19. Adjust the meter pressurization up, by periodic small
increments, until doubles occur (actual population
begins rising above target). Note the pressure at
which doubles begin.
Note: If unable to adjust up to doubles (or skips happen
instead), seed delivery is probably being starved of
air. Increase fan rpm and repeat limit search.
20. Adjust meter pressurization to a value halfway
between the limits established at step 17 and
step 19. This is the ideal value for your crop, disk and
population, providing equal margin against skips and
doubles. Record this value for future use.
Alternate Skip/Double Check
Small seeds, particularly Milo, are less reliably sensed as
skips or doubles by the seed tube sensors, and watching
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 fan running.
D. Inspect the seed disks closely. Look for empty seed
cells (skips) and cells with multiple seeds (doubles).
E. Repeat step B-step D until limits are established.
Record limits. Re-install rain covers. Plant with
median settings.