Great Plains YP4025A Operator Manual - Manual (Page 98)

94 YP4025A Table of Contents Index Great Plains Manufacturing, Inc.
401-627M Table of Contents Index 2013-04-24
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
manual.
Overlapping passes Check marker extension (page 167).
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.
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
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 manual.
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.
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.