Great Plains 2525A Operator Manual - Manual (Page 37)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 33
2013-06-04 Table of Contents Index 118-999M
Setting Planting Rate
Full details on rate setting sprocket selection and instal-
lation are found in the Seed Rate Manual (pub. number
118-999B). This is a summary. Adjusting the seeding
rate requires the following:
1. installing seed disks compatible with the crop and
field speed for the intended population,
2. adjusting drive speed Range sprockets,
3. adjusting Transmission sprockets,
4. setting seed inlet shutters and meter pressure,
5. checking seeding rate.
Seed Disk Selection and Installation
See the Seed Rate Manual for seed disk selection. In
this manual, see “Air-Pro® Meter Disk Installation” on
page 48. Before setting the seeding rate, rotate the
gauge wheels. Check that seed meters, seed tubes and
drives are working properly and free from foreign mate-
rial.
Range and Transmission
Refer to Figure 19
Set the same Range and Transmission sprocket combi-
nations on both gauge wheel assemblies. Select the
correct DRIVING/DRIVEN pairing from the storage
shafts on the gauge wheel assembly. Driven Transmis-
sion shaft is also one of the sprocket storage shafts.
Each gauge wheel drives its half of the drill. If a chain
breaks or is removed, that half of the drill does not plant.
Drive Speed Range Sprockets
Range sprockets are at front left on each gauge wheel
assembly. Determine the correct drive speed Range
sprockets for your seed by referring to the Seed Rate
Manual.
Transmission Sprockets
The Transmission sprockets are at top right on each
gauge wheel assembly. Determine the correct drive
speed Transmission sprockets for your seed by referring
to the Seed Rate Manual.
Shutters and Manifold Pressure
Obtaining a consistent seed rate, with minimum skips
and doubles, requires adjusting the meter seed inlet
shutter opening, and operating the air system at the a
pressure most likely to hold one, and only one, seed per
pocket in the seed disk.
The Seed Rate Manual provides suggested initial set-
tings for both shutter and pressure. See page 46 for
shutter adjustments. See page 35 for pressure adjust-
ments.
Checking Planting Rate
Without an optional seed monitor, it is crucial to perform
an actual furrow check early in the planting to assure that
you are obtaining the desired rate. Periodic inspection of
meters, and further furrow checks, ensure that rate is not
upset by seed run-out, blockages and malfunctions.
The optional seed monitor senses seed passage below
the meter. It accurately counts individual larger seeds,
and functions as a blockage monitor for smaller seeds.
However, a furrow check is still wise, as setup errors and
speed mis-calibration can cause the monitor to report a
false rate.
Figure 19
Drive Sprockets
26218
DRIVEN
DRIVING
DRIVING
DRIVEN
RANGE
TRANSMISSION