Great Plains 3PYPA Operator Manual User Manual
Page 96
92
3PYPA
Great Plains Manufacturing, Inc.
401-647M
03/20/2012
Null4.aac:
Population Related
Problem
Cause
Solution
Overall
Population
Alarms
False alarms or actual rate errors
due to monitor setup with incor-
rect [active] row count or spacing
When troubleshooting population issues, always first rule out
seed monitor setup. Review planter configuration and monitor
setup.
Incorrect cell count
Replace seed disks with correct disks, or reset rate for current
disks (if within range).
Improper gap on speed sensor.
Check speed sensor on planter for
1
⁄
16
in to
1
⁄
8
in (1.6-3.2mm)
gap from wheel. Improper gap can cause erratic speed signal
causing monitor to falsely report improper planting rate.
Incorrect speed sensor constant
Perform speed calibration per DICKEY-john
®
monitor man-
ual.
Mismatch
Between
Reported and
Furrow
Population
Small seeds (example milo) are
not reliably sensed in the seed
tube
Run with rain covers in place to minimize ambient light intru-
sion. Use the population adjustment factor in the Dickey John
monitor system to compensate for missed seeds. For exam-
ple, change the DICKEY-john
®
Population Adjustment values
from 100% to 130% or 140% as needed. Remember to set
this back to 100% for large seeds.
Seed tube sensor is not counting
all seeds
Clean the seed tube of graphite and dust buildup with long
narrow seed tube brush. Replace sensors that malfunction.
Seeds / revolution value in the
DICKEY-john
®
setup does not
match the disk cell count.
Correct the value in a setup screen or install the correct cell
count disc.
Excessive
Seed
Cracking
Incorrect seed pocket size
Use correct disk for seed.
Damaged, old or dried-out seed
Use new seed.
Unclean seed
Use clean seed.
Skips and
Bare Spots
After Turns
Fan was turned off at turns
Leave fan running. Meter Pressurization must be maintained
during turns, or seed will fall out of disk pockets.
Insufficient hydraulic flow to keep
fan running at speed required to
maintain meter pressurization
Check tractor capability against requirements (page 138).
If sufficient:
• Fold markers before engaging lift.
• Use a less aggressive lift rate.
• Monitor fan rpm during end-of-pass operations.
Unable to
adjust air
pressure low
enough.
Lower limit reached in
DICKEY-john
®
software.
At User Level 2, reduce the controlled air lower limit in the
software.
Fan speed too high, vane rotated
to maximum.
Reduce the fan speed.
Seed too
shallow or
scattered on
ground from a
single row
Bottom of seed tube damaged.
Replace seed tube. Avoid setting planter straight down. Use
forward motion when lowering.
Row not penetrating in tire tracks. Increase down force on parallel arm springs.
Opener depth too shallow.
Change side depth wheel setting.