Great Plains YP4025A Operator Manual User Manual
Page 96
92
YP4025A
Great Plains Manufacturing, Inc.
401-627M
2013-04-24
Overall
Low
Population
(cont.)
Air pressure too low, 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
in 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.
Low fan speed: meter starvation due to
meter pressurization, leaving insufficient air
for seed delivery
Increase fan speed.
Leaking meters in split row: meter starvation
due to meter pressurization leaving
insufficient air for seed delivery
Install blank disks and close shutters on unused rows.
Excess field speed
Plant within speed ranges recommended in seed rate
charts.
Incorrect speed sensor constant.
Perform speed radar calibration per DICKEY-john
®
monitor manual. See page 168.
Speed sensor angle.
With planter lowered, check radar speed sensor angle
per DICKEY-john
®
recommendations.
Pass gaps too large
Check marker extension (page 167).
For GPS, check planter size programmed.
Actual field size is different
Population may be correct, and calculations are not.
Low
Population,
One
Section
Clutch slipping, due to contaminants in
clutch, or wear
Lock-up clutch (page 47) until it can be overhauled or
replaced
Skipping chain from drive to section
Check chain slack.
Replace worn chain.
Low
Population,
Single Row
Shutter opening too wide - interfering with
meter pressurization
Adjust shutter to lower setting.
Shutter opening too narrow - starving meter
of seed (low seed pool)
Adjust shutter to higher setting.
Y-tube partially or completely closed,
reducing bulk flow to meter or causing
bridging
Open Y-tube for row
Meter starvation due to bridging at shutter
Re-adjust for shutter bridging (page 81).
If seed is treated, increase seed lubricant.
Meter starvation due to bridging above inlet,
caused by low seed delivery air flow
Clear bridge (page 81). Check that seed delivery
system is getting sufficient fan air, and that there are
no other obstructions upstream.
Meter starvation due to bridging above inlet,
caused by high levels of seed treatment
Clear bridge (page 81). Increase seed lubricant.
Population Too Low
Problem
Cause
Solution