Great Plains 3PYPA Operator Manual User Manual
Page 95
Great Plains Manufacturing, Inc.
Troubleshooting
91
03/20/2012
401-647M
Null4.aac:
Metadata: End of “Population Too High“
Population Too High
Problem
Cause
Solution
Overall High
Population
Incorrect seed rate
Check seed rate charts
Two seeds per pocket on the disk
(doubles), due to excess meter pres-
surization
Methodically decrease the controlled air to the meter. See
“Fan and Adjustment” on page 62.
Two seeds per pocket on the disk
(doubles), due to pockets too large
for the seed
Select a disk with smaller pockets.
Air meter pressure too high due to
pressure sensor not zeroed properly.
Re-zero the air pressure with the fan off. Make sure the dis-
played pressure reads 0.00.
Air pressure too high, false informa-
tion driving the DICKEY-john
®
soft-
ware.
Compare the air pressure reported on the monitor console to
the mechanical gage. If they do not match:
• Inspect the
1
⁄
4
in sample lines from the row units up to the
sensor chamber for leaks.
• Make sure all non-planting rows have blank disks.
• Re-zero the air pressure with the fan off.
False alarms or actual seed rate
errors due to monitor setup with
incorrect row count, spacing or
active rows
When troubleshooting population issues, always first rule out
seed monitor setup. Review planter configuration and moni-
tor setup.
Incorrect cell count
Replace seed disks with correct disks, or reset rate for cur-
rent disks (if within range).
Incorrect speed sensor constant
Perform speed calibration per DICKEY-john
®
monitor man-
ual.
Doubles due to incorrect disk for
crop or seed size
Use recommended disk for crop and seed size.
Sticky seeds: excess seed treatment Increase seed lubricant.
Overall High
Population,
cont.
Speed sensor angle.
With planter lowered, check radar speed sensor angle per
DICKEY-john
®
recommendations.
Incorrect speed sensor constant
Perform speed calibration per DICKEY-john
®
monitor man-
ual.
Overlapping passes
Check marker extension (page 164).
For GPS, check planter size programmed.
Actual field size is different
Population may be correct, and calculations are not.
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.