Great Plains YP1625A Operator Manual - Manual (Page 86)

82 YP1125A & YP1625A Table of Contents Index Great Plains Manufacturing, Inc.
401-625M Table of Contents Index 2013-08-13
Population Too High
Problem Cause Solution
Overall High
Population Incorrect seed rate Check seed rate charts
Ground Drive only: Incorrect
Transmission sprockets or shafts
used Check Transmission sprocket tooth counts and Driver/Driven
locations.
Ground Drive only: Incorrect Range
sprockets or shafts used Check Range sprocket tooth counts and Driver/Driven
locations.
Two seeds per pocket on the disk
(doubles), due to excess meter
pressurization Methodically decrease the controlled air to the meter. See
“Fan and Meter Pressurization Adjustment” on page 51.
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
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 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.
Overall High
Population 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).
Improper gap on speed sensor. Check speed sensor on planter for
1 ⁄
16
inch to
1 ⁄
8
inch
(1.6 to 3.2 mm) 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.
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.
High
Population,
One Wing Ground Drive only: LH and RH
Range setup not matched. Make sure LH and RH Range settings are identical, and that
sprockets are on proper DRIVING/DRIVEN shafts.
Ground Drive only: LH and RH
Transmission setup not matched. Make sure LH and RH Transmission settings are identical,
and that sprockets are on proper DRIVING/DRIVEN shafts.