
2018-07-30
401-805M
YP4425A
Troubleshooting
88
Population Too High
Problem
Cause
Solution
Overall High
Population
Incorrect seed rate
Check seed rate charts
Two seeds per pocket on the disc
(doubles), due to excess meter
pressurization
Methodically decrease the controlled air to the meter. See “
Two seeds per pocket on the disc
(doubles), due to pockets too large for
the seed
Select a disc 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 displayed
pressure reads 0.00.
Air pressure too high, false information
driving the DICKEY-john
®
software.
Compare the air pressure reported on the monitor console to the
mechanical gage. If they do not match:
•
Inspect the
1
/
4
inch sampling lines from the row units up
to the sensor chamber for leaks.
•
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 monitor setup.
Incorrect cell count
Replace seed discs with correct discs, or reset rate for current discs
(if within range).
Incorrect speed sensor constant
Perform speed calibration per DICKEY-john
®
monitor manual. See
Doubles due to incorrect disc for crop or
seed size
Use recommended disc for crop and seed size.
Sticky seeds: excess seed treatment
Increase seed lubricant.
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 manual.
Overlapping passes
Check marker extension (page 154).
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 disc with higher cell
count.
Install correct disc.
Содержание YP4425A
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Страница 169: ...Table of Contents Index Table of Contents Index...
Страница 170: ...Great Plains Mfg 1525 E North St P O Box 5060 Salina KS 67402...