Great Plains 2525A Operator Manual - Manual (Page 39)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 35
2013-06-04 Table of Contents Index 118-999M
Fan and Adjustment
1. These steps presume that correct seed disks are
installed (per Seed Rate Manual), and the seed inlet
shutters are set for the seed (page 46).
2. With fan off, check meter pressure reported by the
Magnehelic®
a
gauge. Re-zero as needed.
3. Determine the recommended meter pressure based
on your own notes or the published value in the
Seed Rate Manual.
4. Put tractor in Park and set brakes. Set tractor engine
speed to typical field rpm. Lift drill.
5. 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
pressure to the developed or suggested value from
step 3.
6. Rotate gauge wheels 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 sev-
eral rain covers, and check for seed in meters by
looking through the clear disks.
Note: Meter fill must be done separately for each drill
section.
7. Re-check meter pressure. With meters and disks
filled, air loss through empty disk pockets is reduced,
and meter pressurization can change.
8. Begin planting. Troubleshoot any obvious problems
or optional seed monitor alarms.
9. During the first pass, take note of the average popu-
lations reported on the optional seed monitor.
If no seed monitor is installed, or the reported seed
monitor population varies from your intentions by a
significant amount, it is imperative to perform a fur-
row check.
For serious rate variances, for which the source of
the problem and the solution are not quickly deter-
mined, see “Population Troubleshooting Charts”
on page 58.
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 pres-
surization may correct either condition (see step 12).
a. Magnehelic is a registered trademark of Dwyer Instruments, Inc.
1
Figure 21
Magnehelic® Gauge
29842
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)
1
2
3
4
3
2
4
Small seeds, such as Milo, may be under-reported by
the optional seed monitor. Use the “Alternate
Skip/Double Check” below to verify seed status at the
disc pockets.
Furrow Check:
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”