Great Plains YP1625A Operator Manual User Manual
Page 87
Great Plains Manufacturing, Inc.
Troubleshooting
83
2013-08-13
401-625M
High
Population,
Single Row
Excess meter pressurization causing
doubles
Check shutter.
Worn seed-drop brush and/or strip
brushes allowing excess seed to
pass
Replace worn brushes.
Incorrect seed disk with higher cell
count.
Install correct disk.
Population Too High
Problem
Cause
Solution
Population Related
Problem
Cause
Solution
Overall
Population
Alarms
False alarms or actual rate errors
due to monitor setup with
incorrect [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
inch to
1
⁄
8
inch
(1.6 to 3.2 mm) 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
manual.
Low
Population
Bands Just
After Turns
Insufficient oil to fan - meter
pressures low - seeds falling from
disks.
Perform end-of-pass marker and lift operations separately. If
already performing separately, reduce marker speed, and/or
list more gradually.
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
intrusion. Use the population adjustment factor in the
DICKEY-john
®
monitor system to compensate for missed
seeds. For example, 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.
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.