Seed population troubleshooting charts – Great Plains YP1630F-1670 Operator Manual User Manual
Page 69
Great Plains Manufacturing, Inc.
Troubleshooting
65
2012-12-27
401-832M
Seed Population Troubleshooting Charts
Seed Population Too Low
Problem
Cause
Solution
Overall Low
Population
Incorrect seed rate
Check seed rate charts
Incorrect Transmission sprockets or shafts
used
Check Transmission sprocket tooth counts and
Driver/Driven locations.
Incorrect Range sprockets used
Check Range sprocket tooth counts and Driver/Driven
locations.
Seed size: rate is correct, but
under-counted. Very small seeds (e.g.
Milo) may not be sensed accurately.
Rely on furrow check for verifying population.
Finger Meter: all brushes mis-adjusted or
worn.
Adjust brushes (page 58). Check for wear if adjustment
does not correct rate.
Finger Meter: incorrect insert for crop
Consult dealer about alternate inserts.
Finger Meter: field speed too high for
6-finger meter
Switch to 12-finger meters.
Brush Meter: Empty pockets on plates
(skips) due to sticky seed treatments not
allowing seed to rapidly fill the pockets.
Increase seed lubricant.
Brush Meter: Empty pockets on plates
(skips) due to rough field conditions
causing seeds to fall from the plates.
Decrease field speed.
Brush Meter: Empty pockets on plates
(skips) due to platter speed too high, and
pockets are not filling.
Decrease field speed or change to a higher cell count
plate.
Brush Meter: Empty pockets on plates
(skips) due to seed too big for pocket.
Select the correct plate for the seed size.
Brush Meter: Seeds are not falling from
plates, and get carried 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.
Inadequate ground drive wheel spring
pressure
Check for correct spring setting, page 73.
Improper gap on speed sensor.
Check speed sensor on planter for 1.6 to 3.2 mm
(
1
⁄
16
inch to
1
⁄
8
inch) 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 PM400 monitor manual.