Great Plains YP4425A Operator Manual User Manual
Page 89
Great Plains Manufacturing, Inc.
Troubleshooting
85
2012-02-23
401-805M
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
inch sampling lines from the row units
up to the sensor chamber for leaks.
• 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.
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 151.
Speed sensor angle.
With planter lowered, check radar speed sensor angle
per DICKEY-john
®®
recommendations.
Pass gaps too large
Check marker extension (page 150).
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 44) 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 76).
If seed is treated, increase seed lubricant.
Meter starvation due to bridging above inlet,
caused by low seed delivery air flow
Clear bridge (page 76). 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 76). Increase seed lubricant.
Population Too Low
Problem
Cause
Solution