Great Plains 3P4025AH Operator Manual User Manual
Page 77
Great Plains Manufacturing, Inc.
Troubleshooting
73
2014-07-29
411-099M
Overall
Low
Population,
cont.
Pass gaps too large
For GPS, check planter size programmed.
Actual field size is different
Population may be correct, and calculations are not.
Seed monitor reporting excess area
Readings can vary with conditions (wheel slippage,
and effective rolling radius in soft soils) and planting
patterns.
Low
Population,
Single Row
Shutter opening too narrow - starving meter
of seed (low seed pool)
Adjust shutter to higher setting.
Meter starvation due to bridging at shutter
Re-adjust for shutter bridging (page 61).
If seed is treated, increase seed lubricant.
Meter starvation due to blockage above inlet Clear blockage (page 61).
Meter starvation due to bridging above inlet,
caused by high levels of seed treatment
Clear bridge (page 61). Increase seed lubricant.
Incorrect seed disk on one row
Install correct seed disk.
Chain skipping at row unit.
Check chain, idler and sprocket condition.
Skips due to low meter pressurization at one
or several rows
Check shutter setting. Check for excess wear on seed
drop brush. Check for loose or leaking pressure hose.
Skips due to skipping chain
Check for worn chain, worn idlers, low chain slack
(page 84) and failed meter bearing.
Skips due to debris in disk pockets
Remove rain covers. Inspect and clean out disks.
Row has blank disk installed
Replace with seeding disk.
Seed tube plugged
Raise planter, expose bottom of seed tube and clean
out.
Low or
Erratic
Seed Flow
Seed meter plugged, due to operation with
fan shut off, or manifold pressure too low.
Close shutters. Clean-out meters. Set fan for correct
manifold pressure. Resume planting.
Population Too Low
Problem
Cause
Solution
Population Too High
Problem
Cause
Solution
Overall High
Population
Incorrect seed rate
Check seed rate charts
Two seeds per pocket on the disk
(doubles), due to excess meter
pressurization
Methodically decrease the meter pressurization.
See “Fan and Adjustment” on page 42.
Two seeds per pocket on the disk
(doubles), due to pockets too large for
the seed
Select a disk with smaller pockets.
The meter pressurization is too high, as
confirmed by gauge
Reduce fan speed or increase butterfly valve setting.
Air meter pressure too high due to
pressure sensor not zeroed properly.
Re-zero the gauge with the fan off.