Great Plains YP825A Operator Manual User Manual
Page 92
88
YP425A, YP625A and YP825A
Great Plains Manufacturing, Inc.
401-651M
2014-08-15
Overall High
Population,
cont.
Air pressure too high, but gauge is within
range or reading low.
Check:
• Inspect the
1
⁄
4
inch sample lines from the row units up
to the sensor chamber for leaks (page 85).
• Make sure all non-planting rows have blank disks
(page 78).
• Check that rubber pressure relief plug is seated in
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 disks with correct disks, or reset rate for
current disks (if within range).
Incorrect speed sensor constant.
Perform speed calibration per seed monitor manual.
Incorrect magnetic speed sensor gap.
(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.
Incorrect speed sensor constant
Perform speed calibration per DICKEY-john
®
monitor
manual.
Overlapping passes
Check marker extension (page 165).
For GPS, check planter size programmed.
Actual field size is different
Population may be correct, and calculations are not.
Seed monitor under-reporting area
Readings can vary with conditions (wheel slippage, and
effective rolling radius in soft soils) and planting
patterns.
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.
Worn meter bearing causing seed disk
wobble and doubles
Replace meter bearing.
Incorrect seed disk with higher cell count. Install correct disk.
Population Too High
Problem
Cause
Solution