Fan and adjustment, Furrow check – Great Plains YP825A3P Operator Manual User Manual
Great Plains Manufacturing, Inc.
Fan and Adjustment
These steps presume that correct seed disks are
installed (per Seed Rate Manual), and the seed inlet
shutters are set for the seed (page 55).
With fan off, check meter pressurization reported by
gauge. Re-zero as needed.
Determine the recommended meter pressurization
based on your own notes or the published value in
the Seed Rate Manual.
Put tractor in Park and set brakes. Set tractor engine
speed to typical field rpm. Lift planter.
Start the fan. Gradually increase fan speed using the
tractor’s hydraulic flow control for the circuit. Using
hydraulic flow and/or the butterfly valve, adjust meter
pressurization to the developed or suggested value
from step 3.
Rotate ground drive wheel to fill meters. Meters are
filled when seed begins emerging below two or more
openers. With fan running, put the tractor in Park and
set the brakes. Walk behind the wings, remove
several rain covers, and check for seed in meters by
looking through the clear disks.
Re-check meter pressurization. With meters and
disks filled, air loss through empty disk pockets is
reduced, and meter pressurization can change.
Begin planting. Troubleshoot any obvious problems
or optional seed monitor alarms.
During the first pass, take note of the average
populations reported on the optional seed monitor.
If the reported seed monitor population varies from
your intentions by a significant amount, it is
imperative to perform a furrow check.
For serious rate variances, for which the source of
the problem and the solution are not quickly
determined, see “Population Troubleshooting
Charts” on page 67.
If the population is only slightly low, the problem can
be skips (periodic empty disk pockets). If slightly
high, the problem can be doubles (period pockets
with double seed). An adjustment to the meter
pressurization may correct either condition (see
is a registered trademark of Dwyer Instruments, Inc.
Re-zero the Magnehelic
gauge on level ground with
the fan off, and if possible, under no-wind conditions.
Turn the set screw
on the meter face until it reads
zero from the tractor driver’s viewing position.
Port ID for Troubleshooting:
Over-pressure relief port (with plug in place)
Low-pressure port (breather/atmospheric pressure)
High-pressure port (from manifold chamber)
Small seeds, such as Milo, may be under-reported by
the seed monitor. Use the “Alternate Skip/Double
Check” below to verify seed status at the disc pockets.
Expose several seeds in each of several rows, being
careful not to disturb their relative positions. Measure
and average the distance between seeds. Compare this
to the predicted seed spacing for the population in the
Seed Rate Manual.
Any instances of no seed where expected may be a
sign of “skips”. Finding two seeds at the same spot is
clear indication of “doubles”