Great Plains YP825A Operator Manual - Manual (Page 91)

Great Plains Manufacturing, Inc. Table of Contents Index Troubleshooting 87
2014-08-15 Table of Contents Index 401-651M
Overall
Low
Population,
cont. Pass gaps too large Check marker extension (page 165).
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 75).
If seed is treated, increase seed lubricant.
Meter starvation due to blockage above inlet Clear blockage (page 75).
Meter starvation due to bridging above inlet,
caused by high levels of seed treatment Clear bridge (page 75). 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 107) 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 sensor obscured Clean out seed tube (see page 98).
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 54.
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.