Population troubleshooting charts – Great Plains 3PYPA Operator Manual User Manual
Page 93
Great Plains Manufacturing, Inc.
Troubleshooting
89
03/20/2012
401-647M
Population Troubleshooting Charts
Population Too Low
Problem
Cause
Solution
Overall
Low
Population
Incorrect seed rate
Check seed rate charts
Empty pockets on disk (skips) due to insuffi-
cient air pressure.
Methodically increase the controlled air to the meter.
See “Fan and Adjustment” on page 62.
Empty pockets on disk (skips) due to sticky
seed treatments not allowing seed to rapidly
fill the pockets.
Increase seed lubricant.
Empty pockets on disk (skips) due to rough
field conditions causing seeds to fall from
the disks.
Decrease field speed or increase the air pressure in
the meter.
Empty pockets on disk (skips) due to seed
pool too low, and seeds are not filling every
pocket on the disk.
Open shutter one notch.
Empty pockets on disk (skips) due to disk
speed too high, and pockets are not filling.
Decrease field speed or change to a higher cell count
disc.
Empty pockets on disk (skips) due to singu-
lation (4 tufted) brush too aggressive.
Check for matted, stuck together fibers. Wash, scrape
clean, or replace as needed.
Empty pockets on disk (skips) due to seed
too big for pocket.
Select the correct disk for the seed size.
Seeds are not falling from disk, and get car-
ried past drop zone. Static electricity can
cause small, lightweight seeds to cling to the
pocket and not fall out.
The graphite component of Ezee Glide Plus addresses
this issue. Increase the amount of Easy Glide Plus
and/or more thoroughly mix the lubricant into the seed.
Overall
Low
Population
(cont.)
Air pressure too low, false information driv-
ing the DICKEY-john
®
software.
Compare the air pressure reported on the monitor con-
sole 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 insuffi-
cient 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.
Speed sensor angle.
With planter lowered, check radar speed sensor angle
per DICKEY-john
®
recommendations.
Pass gaps too large
Check marker extension (page 164).
For GPS, check planter size programmed.
Actual field size is different
Population may be correct, and calculations are not.