Great Plains 2525A Operator Manual - Manual (Page 64)

60 2025A/2525A Table of Contents Index Great Plains Manufacturing, Inc.
118-999M Table of Contents Index 2013-06-04
Population Too High
Problem Cause Solution
Overall High
Population Incorrect seed rate Check seed rate charts
Two seeds per pocket on the disk (dou-
bles), due to excess meter pressurization Methodically decrease the meter pressure.
See “Fan and Adjustment” on page 35.
Two seeds per pocket on the disk (dou-
bles), due to pockets too large for the
seed Select a disk with smaller pockets.
The meter pressure is too high, as con-
firmed by gauge Reduce fan speed or increase butterfly valve setting.
Air meter pressure too high due to pres-
sure sensor not zeroed properly. Re-zero the gauge with the fan off.
Air pressure too high, but gauge is within
range or reading low. Check:
• Inspect the
1 ⁄
4
in sample lines from the row units up to
the sensor chamber for leaks (page 35).
• Make sure all non-planting rows have blank disks
(page 50).
• Check that rubber pressure relief plug is seated in
gauge (page 35).
(option) 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 drill configuration
and monitor setup.
Incorrect cell count Replace seed disks with correct disks, or reset rate for
current disks (if within range).
(option) Incorrect speed sensor constant. Perform speed calibration per seed monitor manual.
(option) Incorrect magnetic speed sensor
gap. Check and adjust (page 97).
(option) Incorrect radar speed sensor
angle. With planter lowered, check radar speed sensor angle
per DICKEY-john® recommendations.
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.
(option) Incorrect speed sensor constant Perform speed calibration per DICKEY-john® monitor
manual.
Overlapping passes Check marker extension (page 100).
For GPS, check planter size programmed.
Actual field size is different Population may be correct, and calculations are not.
Acremeter under-reporting distance Acremeter readings are not 100% precise. The meter
programming is based on an average swath for the drill
size (and never accounts for swath changes if rows are
shut down). Readings also vary with conditions (tire slip-
page, and effective rolling radius in soft soils) and plant-
ing patterns. Also check that acremeter is correct model
and programming for drill. See table on page 26.