GreatPlainsManufacturing,Inc. providesthis publication“as is” without warranty ofany kind,either expressedor implied.While ev eryprecaution has been takenin the preparation
of this manual, Great Plains Manufacturing,Inc. assumes noresponsibility for errors or omissions. Neither isany liability assumed for damages resulting from the use of theinformation contained herein. Great Plains Manufacturing, Inc. reserves the right to reviseand improve its products as it sees fit.This publication describes the state of this product at
the timeof its publication,and may notreflect the productin the future.
The followingare trademarks of Great Plains Mfg.,Inc.: Application Systems,Ausherman, Land Pride,Great Plains
All otherbrands and productnames are trademarks or registered trademarks oftheir respective holders.
01/29/2009196-522B
Great PlainsManufacturing, Incorporated Trademarks
Printed in the United States of America.
Page 3
Great Plains Mfg., Inc.
Introduction
This manual is your guide to planter adjustments for
achieving specific seed population and fertilizer density
targets.
Although some setup/adjustment material herein is
repeated from the drill Operator’s Manual, you need to
be thoroughly familiar with drill operations and adjustments before applying this Seed Rate manual and its
table data.
Accurately obtaining the desired seed population
requires four steps:
1. Setting Drive Type sprockets (from chart)
2. Setting initial Seed Rate Handle (from chart)
3. Positioning Seed Cup Door (by seed type)
4. Calibration: checking actual seeding rate
Seed rate charts, and rate setting/calibratinginformation,
is included in both the Operator’s Manual, and this separate Seed Rate Manual. The Seed Rate manual is normally stored in a weatherproof holder on the drill, for field
reference. The charts list proper sprocket pairings and
seed-rate-handle settings for various seeds and seeding
rates.
The seed-rate charts are based on cleaned, untreated
seed of average size and test weight. The charts are
based on 18-22.5 (445/65 D22.5) NHS 16-Ply tires,
inflated to factory specification. Many factors will affect
seeding rates including foreign material, seed treatment,
seed size, seed weight, field conditions, tire pressure
and test weight. Minor adjustments are commonly
required. Set and check the seeding rate using the procedures below, then readjust the rate as necessary.
Great Plains Mfg., Inc.
196-522B01/29/2009
Page 5
Great Plains Mfg., Inc.
Setting Drive Type
3
Refer to Figure1
Drive Type is determined by the size (tooth count) of a
sprocket on the seed jackshaft of each drill section. If
1
changed, the sprocket must be set identically on each
drill section (3 locations).
For correct Drive Type, refer to seed-rate charts beginning on page 8. The charts list Drive Types as 1, 2, 3 or
4. Each Drive Type corresponds to a specific sized
sprocket, per the table and Figure 2 at right.
Changing Drive Type
Refer to Figure1
1. Loosen top idler and slide idler up.
2. Lift drive chain off sprocket currently in use.
3. Remove lynch pins and rearrange sprockets on jack-
1
shaft.
Note: Sprockets are stored on both ends of jackshaft (1
alternate sprocket under the Drive Type sprocket,
and 2 alternates (plus Fertilizer alternates) on the
far end of the shaft.
Do not mix Drive Type sprocketswith Fertilizer
sprockets on the vertical storage trees.
2
3
3
2
Figure 1
Drive Type 1 Configured
Drive
Type
SprocketRelative Speed
172 ToothSlowest
234 Tooth2.12 times faster than Type 1
323 Tooth3.13 times faster than Type 1
414 Tooth5.14 times faster than Type 1
1
28178
4. Sprocketcorresponding to the required Drive Typeis
remounted as the outermost (, with larger side of
raised hub awayfrom pin, keeping teeth aligned with
driving sprocket at top). Make sure all 4 sprockets
are accounted for when remounting them on the
shaft.
5. Remount drive chain on the outermost (Drive Type)
sprocket.
6. Re-engage top idler and secure. Allow
1
⁄
in (1.3cm)
2
slack in longest (top) span of chain.
7. Set the same Drive Type on all three drill sections.
Figure 2
Drive Type Chain Routing
18839
01/29/2009196-522B
Page 6
3S-4010HD and 3S-4010HDF
4
Main Box Seed Rate Handle
There are main box seed rate handles for each section of
the drill (3 handles total). Generally, all need to be set
identically, and you need to calibrate only one section.
The seed rate handle controls the percent engagement
of the seed sprocket in each seed cup. The initial setting
of the handle is given by the Seed Rate Chart.
Note: Youcantemporarily stop seed flow to a drill section
by setting a handle to zero.
To set a handle:
1. Loosen wing nut under handle.
2. Move indicator to a rate about 10 higher than the
suggested rate from Seed Rate Chart. Then move
handle back to chart rate.
3. Tighten wing nut.
1
1
Fi S
1
Figure 3
Seed Rate Handle
Great Plains Mfg., Inc.
2
28181
Position Seed Cup Doors
Refer to Figure4,
which depicts the seed cup door handle in position.
At each main seed box seed tube, adjust the seed cup
door handle for the seed size.
4
The handle has three normal operating position detents:
(top detent) is for the smallest seeds.
1
Use it for wheat and similar small seeds.
(middle detent) is for larger seeds.
2
Use it for soybeans and similar larger seeds.
(bottom detent) is for oversize or fragile seeds.
3
If you experience excessive cracking with
setting, use setting.
Note: Handle positionis used for cleanout, not plant-
23
5
ing.Ifset to thispositionwithseedloaded, itmaybe
difficult to reset it to a normal operating position.
3
4
1
2
3
Figure 4
Seed Cup Door Handle
5
26211
196-522B01/29/2009
Page 7
Great Plains Mfg., Inc.
Main Box Seed Rate Calibration
Differences will exist between the tested seed and field
conditions used to generate the Seed Rate Charts, and
your seed and conditions. To accurately achieve your target population, Great Plains recommends calibrating.
Perform the calibration with the drill unfolded and lowered to field position. Turn off or disconnect power to the
clutches.
Refer to Figure5
1. Lower drill. Set MASTER switch on clutch control
box to OFF position.
2. Remove the calibration crank from its storage location on the right section drive. Store the pin on the
stob.
3. On the right drill section, if fertilizer rate is not also
being calibrated at the same time, and fertilizer is
present, remove the fertilizer drive chain.
Figure 5
Stored Calibration Crank
5
29240
Refer to Figure6
4. Install cr
ank on clutch shaft of right section.
Crank rotation is clockwise, facing to drill left.
5. Use crank to turn clutch shaft and check that the
drives and seed cups are engaged, working properly
and free from foreign material. If not already done,
set the Drive Type, Seed Rate Handle and Seed Cup
Doors across the drill.
ll C
Figure 6
Installed Calibration Crank
For example:
on a drill with a row spacing of:
7.5 inches
and a row count of:
64
you desire to plant barley at:
50 pounds per acre
which, from the Barley Drive Type 2 chart,
is an initial Seed Rate Handle scale setting of:
40
28180
01/29/2009196-522B
Page 8
3S-4010HD and 3S-4010HDF
6
Great Plains Mfg., Inc.
6. Record the weight of one to three empty containers
collectively large enough to hold seed metered for
6% of one acre or hectare.
7. Place several pounds or kg of seed over three seed
cups on the outside end of the right drill box. Pull
lower end seed hoses off of these drops at the
opener end.
8. Turn the calibration crank several times to fill seed
cups. Turn until seed drops to ground from each
hose.
9. Place empty container(s) under the three hoses to
gather metered seed.
10. Turn crank for one acre (45.1 rotations) or one hectare (111.4 rotations). While turning, check that cups
have ample seed coming into them.
11. Weigh metered seed. Subtract initial weight of container(s).
NetWeightGrossWeight ContainerWeights–=
12. Divide the net seed weight by three. Multiply by number of openers on your drill to determine the total of
pounds-per-acre seeded.
NetWeight
MeasuredRate
------------------------3
OpenerCount×=
For example:
three empty 8 oz. containers weigh a total of:
1.5 lb.
For example: the containers weighed a total of 4.0 lb
after test:
2.7 lb net
2.74.2 1.5–=
For example:
on the 64-row 7.5in drill:
57.5 lb/ac
2.7
57.5
-----3
64×=
13. The Seed Rate Handle scale is a percentage of
meter opening, and is quite linear near scale center.
Calculate a new scale setting based on the test.
TargetRate
NewScale
--------------------------------- MeasuredRate
OldScale×=
Note: You may want to repeat calibration procedure if
your results varied greatly from the Seed Rate
Chart, or if you must operate near the ends of the
Seed Rate handle scale (0-20 or 90-100).
14. Set the center and left drill sections to match the
now-calibrated right section.
15. With calibration complete, Reinstall fertilizer chain (if
removed) and reconnect seed hoses.
When drilling, check seeding rate by noting acres drilled,
amount of seed added to drill and seed level in drill box.
If you are seeding more or less than desired, adjust rate
slightly to compensate for field conditions.
For example:
the target rate was 50 lb/ac, and the initial scale 40:
the new scale setting is:
35
50
---------
35
57.5
40×=
196-522B01/29/2009
Page 9
Great Plains Mfg., Inc.
Reading a Seed Rate Chart
Charts in U.S. customary units begin on page 8.
Metric charts begin on page 25.
1. Find your seed. Charts are in alphabetical order by
seed name. Charts covering more than one seed
may be out of order.
For Rape, see Alfalfa.
For Sudan, see Flax.
This example presumes we desire to plant Barley at
50 pounds per acre with a 7.5in drill.
There are multiple charts for some seeds, and the
rates may overlap. Use the chart where your desired
rate is closest to 50 on the Seed Rate Handle scale.
In our example, that would be Barley chart 2 of 3.
If your seed is not listed, find one with similar size,
shape and density. Density of the test seed used to
develop the chart appears under the right end of the
handle scale values.
7
2. Note the Drive Type in the upper left corner of the
chart for your seed. This number (1-4) is used to
determine the seed jackshaft sprocket. See page 3.
In our example, this is Drive Type 2 (34T sprocket).
3. Find your row spacing in the far left column.
4. Locate your desired seed rate in the table row for
your row spacing.
In our example, 49 is the closest to 50.
5. Note the Seed Rate Handle setting required, at the
top of the column at that seed rate. This is the initial
value set on the Seed Rate Handle. See page 4.
In our example, we will start with a handle setting of
40, and calibrate. When a target rate falls halfway
between handle settings, you can adjust the handle
slightly to compensate, but calibration is apt to result
in further adjustment anyway.
01/29/2009196-522B
Page 10
3S-4010HD and 3S-4010HDF
8
Great Plains Mfg., Inc.
Main Box Seed Rate Charts
U.S. Customary Units. Metric charts begin on page 25.
Alfalfa or Rape
Drive Type
10510 15 20 253035404550556065707580859095 100
RowsSeed Rate in Pounds Per Acre(based on 60 pounds/bushel)
The 3S-4010HDF fertilizer meters are driven from the
clutch shaft through a series of sprockets.This system is
independent of the seed meter drive, and is unaffected
by Drive Type. Fertilizer rate is adjusted by changing 1 to
4 sprockets on each drill section (3 or 6 pairs total).
Fertilizer application rates vary with fertilizer type, density and particle size. Relative humidity and field conditions can also affect application rates. The chart on
page 31 is based on fertilizer with average particle size
and a density of 65 pounds per cubic foot. Initially set
rate according to charts, then calibrate the drill to your
material as described on this page.
Perform initial setup and calibration for the right drill box.
Once determined, set the center and left boxes to match.
Accurately obtaining the desired application rate requires
four steps:
1. Adjusting target rate for large differences between
material and chart density.
The fertilizer meter rate chart is based on fertilizer with a
density of 65 pounds per cubic foot (1.04 kg/liter). If your
fertilizer density is within a few percent of that, skip step
a through step e and use calibration to determine final
Driver/Driven setup.
For larger variances, particularly with very low densities,
pre-compensating can simplify calibration, bychoosing a
different target chart value for the application rate.
a. Find your actual material density. Normally, this
reported on the container in which it was supplied. If
not, weigh a known volume and calculate it.
b. Find your material Density in the table at right, and
the Conversion Factor below it.
c. Adjust your target application rate prior to consulting
the Fertilizer Rate Chart.
AdjustedRateTargetRateConversionFactor×=
d. Find the Adjusted rate in the Fertilizer Rate Chart.
e. Calibrate using the Adjusted rate sprocket setup.
Density: lbs/cu-ft
(kg/liter)
Conversion Factor1.451.301.201.10
Density: lbs/cu-ft
(kg/liter)
Conversion Factor1.000.930.870.81
Example: 64 row 7.5in drill
Your fertilizer has a density of 60 pounds/cubic-foot,
and you want to apply 140 pounds/acre. First, adjust
the density:
1551401.10×=
Example:
The adjusted 155 rate corresponds to either:
LOW Range 24T/12T Transmission, or
HIGH Range, and 12T/21T Transmission.
45.0
(0.72)
65.0
(1.04)
50.0
(0.80)
70.0
(1.12)
55.0
(0.88)
75.0
(1.20)
60.0
(0.96)
80.0
(1.28)
196-522B01/29/2009
Page 17
Great Plains Mfg., Inc.
Setting Fertilizer Drive Range
Refer to the Fertilizer Rate Chart on page 31 to find the
correct Range sprocket size for your drill’s row spacing
and the target (or adjusted) application rate.
Ranges overlap. Choose a Range so that the Transmission (Driver/Driven)pairing is further from the end of that
Range chart, reducing the chances that a Transmission
adjustment might also require a Range change.
Change fertilizer range requires changing one or two
sprockets per drill section, per the table at right. An idler
1
is loosed and re-engaged for any sprocket change.
Refer to Figure7
Range: Front Sprocket
15T
The two Front range sprockets (,) are permanently installed, and are exchanged by sliding left and
right on the shaft. Remove the spring-clasp polymer
spacer to permit sliding, and re-insert it as instructed
2
below to keep the Front and Rear sprockets aligned.
41T
15
In our example, two settings are near the adjusted rate:
LOW Range 24T/12T Transmission, or
HIGH Range, and 12T/21T Transmission.
Use the HIGH Range setting, as it is further from the
end of the chart, allowing easier adjustment.
Fertilizer Range
SprocketsLowHigh
Front15T41T41T
Rear60T47T16T
Ultra
High
Range: Rear Sprocket
There are three possible Rear range sprockets (,
47T 60T
,). Remove a lynch pin (not shown) to change
3
16T
this sprocket.
The two rear range sprockets not presently in use are
stored on the Driven Transmission shaft, directly
4
below the Rear range shaft.
There are also main box Drive Type sprockets stored
here, but the tooth counts are unique to each drive.Tooth
counts are stamped into the face of each sprocket.
Changing Range Sprockets
1. Loosen the Range idler.
2. If the Front sprocket needs changing:
remove the polymer spacer;
slide both sprockets to where spacer was; and,
re-clasp spacer on the other side of sprocket pair.
3. If the Rear sprocket needs changing:
remove the pin from the rear and storage shafts;
remove the current Rear sprocket;
remove the next sprocket from storage;
place the next sprocket on the Rear shaft and re-pin;
return other sprockets to the lower shaft and re-pin.
4. Re-engage the Range idler for
the top chain span.
5. If this is the final Range setting, after calibration,
repeat step 1 through step 4 for the center and left
drill sections.
2
3
1
⁄
in (6.4mm) slack in
4
4
3
2
41T
4
15T
1
Figure 7
Range Sprockets: Center Section
15T Front Engaged (Low Range)
28179
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Page 18
3S-4010HD and 3S-4010HDF
16
Setting Fertilizer Transmission
Refer to Figure8
The fertilizer Transmission is a Driver/Driven pair of
sprockets located above and behind the Drive Type
sprocket.
Refer to the Fertilizer Rate Charts (pages 19, 20, 31 and
32) to find the correct Transmission (Driver/Driven)
sprocket sizes for your drill’s row spacing and target (or
adjusted) application rate.
DRIVEN
Great Plains Mfg., Inc.
4
DRIVER
2
1
Examine the currently installed sprockets ( ,) to con-
1 2
firm that one or both needs to be changed (or moved
between shafts).
To change the transmission setting:
1. Loosen idlersand rotate idlers out of engagement
3
with chain.
2. Remove pin from vertical storage tower, and
4
retrievenewsprocket(s)required.Return other to the
storage tree, but leave pin off.
3. Remove lynch pinsfrom Driver and/or Driven
sprocket shaft to be changed, and remove
sprocket(s).
4. Place correct Driver and Driven sprockets on their
respective shafts.
5. Store removed sprockets on storage tree.
6. Re-install all pins.
7. Reinstall chain and engage idlers, allowing
1
⁄
in
4
(6.4mm) slack in the top chain span.
8. If this is the final setting, after calibration, repeat step
1 through step 7 for the center and left drill sections.
3
Figure 8
Fertilizer Transmission
28178
196-522B01/29/2009
Page 19
Great Plains Mfg., Inc.
Fertilizer Rate Calibration
Differences will exist between the tested fertilizer and
field conditions used to generate the Rate Chart, and
your fertilizer and conditions. To accurately achieve your
target application, Great Plains recommends calibrating.
Perform the calibration with the drill lowered to field position. Shut off power to the clutches.
If you have previously calibrated your acremeter (see
Operator’s manual), you can use it to tally acres.
Refer to Figure9
1. Lower drill. Set MASTER switch on clutch control
box to OFF position.
2. Remove the calibration crank from its storage location on the right section drive. Remove pin from
crank and return to storage stob.
3. On the right drill section, if seed rate is not also being
calibrated at the same time, and seed is present,
remove the seed box drive chain.
Refer to Figure10
4. Install crank on clutch shaft of right section.
Crank rotation is clockwise, facing to drill left.
5. Use crank to turn clutch shaft and check that the
drives and seed cups are engaged, working properly
and free from foreign material.
Figure 9
Stored Calibration Crank
17
29240
Figure 10
28180
Installed Calibration Crank
6. From the charts, configure the Range and Transmission sprock
ets based on the target or density-
adjusted application rate.
For example:
you desire to apply 60lb/cu-ft material at a rate of:
141 lb/ac
on a 64 row 7.5in drill.
Per the density adjustment on page 14,
the adjusted rate is:
155 pounds/acre
Per the chart, the drive system setup is:
HIGH Range, and
12T/21T Transmission (Driver/Driven)
7. Record the weight of one to three empty containers
collectivelylarge enough to hold fertilizermetered for
6% of one acre or hectare.
01/29/2009196-522B
For example:
three empty 8 oz. containers weigh: 1.5 lb.
Page 20
3S-4010HD and 3S-4010HDF
18
8. Place several pounds or kilograms of fertilizer over
three fertilizer openings at the outside end of the
right drill box. Pull lower end fertilizer hoses off of
these drops at the opener end.
9. Turn crank several times to fill flute cups. Turn until
fertilizer drops to ground from each hose.
10. Place empty container(s) under the three hoses to
gather metered fertilizer.
11. Turn crank for acre (45.1 rotations) or one hectare
(111.4 rotations). While turning, check that cups
have ample fertilizer coming into them.
12. Weigh metered fertilizer. Subtract initial weight of
container(s).
NetWeightGrossWeight ContainerWeights–=
Great Plains Mfg., Inc.
!
CAUTION
Follow material supplier recommendations for safety precautions in handling fertilizer.
For example:
the three containers weighed a total of 8.9 lb. after test:
7.4 lb. net
7.48.9 1.5–=
13. Divide the net fertilizer weight by three. Multiply by
number of openers on your drill to determine the
total of kg or pounds-per-acre applied.
NetWeight
MeasuredRate
14. Subtract to calculate the difference between the
measured rate and the original target (not adjusted)
rate.
VarianceTargetRate MeasuredRate–=
15. If a Density Adjustment was made (see page 14),
apply it to the variance.
AdjustedVarianceVarianceCorrectionFactor×=
16. Consult the chart for the chart rate used for your first
calibration run with this material. If the just-measured
result was low, add the [adjusted] variance to the
previously used chart rate. If the measured result
was high, subtract the [adjusted] variance from the
previous chart rate.
17. Reset the fertilizer Range and Final Drive based on
the settings at the new chart rate.
18. You may want to repeat calibration procedure if your
results varied greatly from the desired target rate.
19. With calibration complete, Reinstall seed chain (if
removed) or reset Seed Rate Handle, reconnect
hoses, and lower gauge wheel to ground.
20. Set the center and left drill sections to match the
now-calibrated right section.
When drilling, check metering rate by noting acres
drilled, amount of fertilizer added to drill and level of
material in drill box. If you are applying more or less fertilizer than desired, adjust metering rate slightly to compensate for field conditions.
------------------------3
RowCount×=
For example:
a 64-row (7.5cm) drill:
158 lb/ac
7.4
157.9
For example: the target rate was 141 lb/ac:
variance=17
17158 141–=
For example: the density adjustment factor was 1.10:
new variance=19
19171.1×=
For example:
Our measured rate was high, so we
subtract the adjusted variance (19)
from the previous adjusted chart rate (155)
to obtain a new adjusted chart rate (137).
This is close to:
LOW chart rate 137, and
HIGH chart rate 135.
Use either new drive setup:
Rate:
Range:
Driver:
Driven:
-----3
137
LOW
23T
13T
64×=
Rate:
Range:
Driver:
Driven:
135
HIGH
12T
24T
196-522B01/29/2009
Page 21
Great Plains Mfg., Inc.
Fertilizer Rate Charts, U.S. Customary Units
Fertilizer Rate, 7.5in Row Spacing
Based on 65 pounds per cubic foot
(see page 31 for 19.2cm metric chart))
7.5inFertilizer Rate7.5inFertilizer Rate
Row SpacingPounds per AcreRow SpacingPounds per Acre
TRANSMISSIONFertilizer Rates by RANGETRANSMISSIONFertilizer Rates by RANGE
Seeding rate from the optional Small Seeds Attachment
is controlled entirely by seed rate handles on each small
seeds box. No sprocket changes are required, and small
seeds rate is unaffected by settings for main seed box.
Refer to Figure11
To set Small Seeds rate, loosen the wing nut at each
handle, and adjust the lever position. Tighten nut.
2
1
Small Seeds Rate Calibration
Differences will exist between the tested seed and field
conditions used to generate the Small Seeds Rate
Charts, and your seed and conditions. To accurately
achieve your target population, Great Plains recommends calibrating.
As small seed rates are typically far lower than main box
seed rates, use a scale that is accurate for small weight
differences, or sample more than the usual three rows.
1. Lower drill. Set MASTER switch on clutch control
box to OFF position.
2. Set the small seed rate handle based on the seed
and rate desired.
Refer to Figure12
3. Remove the calibration crank from its storage location on the right section drive. Remove pin from
crank and return to storage stob.
4. On the right drill section, if fertilizer rate is not also
being calibrated at the same time, and fertilizer is
present, remove a fertilizer box drive chain on the
right drill section.
2
1
Figure 11
Small Seeds Rate Handle
For example: using a row spacing of:
7.5in
and a row count of:
64
you desire to plant alfalfa at:
8 lbs/ac;
this corresponds to an initial Seed Rate Handle of:
40
18511
Figure 12
Stored Calibration Crank
Refer to Figure13
5. Install crank on clutch shaft of right section.
Crank rotation is clockwise, facing to drill left.
6. Use crank to turn clutch shaft and check that the
drives and seed cups are engaged, working properly
and free from foreign material. If not already done,
set the Small Seeds Rate Handle.
Figure 13
Installed Calibration Crank
01/29/2009196-522B
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28180
Page 24
3S-4010HD and 3S-4010HDF
22
7. Check that your gauge-wheel tires are 18-22.5 (445/
65 D22.5) NHS 16-Ply and properly inflated. See
“Tire Inflation Chart” in Operator’s manual.
Great Plains Mfg., Inc.
8. Record the weight of one to three empty containers
collectively large enough to hold seed metered for
6% of one acre.
9. Place several pounds or kilograms of seed over
three seed cups on the outside end of the right drill
box. Pull lower end seed hoses off of these drops at
the opener end.
10. Turn crank several times to fill seed cups. Turn until
seed drops to ground from each hose.
11. Place empty container(s) under the three hoses to
gather metered seed.
12. Turn crank for one acre (45.1 rotations) or one hectare (111.4 rotations). While turning, check that cups
have ample seed coming into them.
13. Weigh metered seed. Subtract initial weight of container(s).
NetWeightGrossWeight ContainerWeights–=
14. Divide the net seed weight by the number of rows
sampled (3 in our example). Multiply by number of
openers on your drill to determine the total of
pounds-per-acre seeded.
NetWeight
MeasuredRate
------------------------3
RowCount×=
For example:
three 8 oz. containers weigh at total of:
1.5 lb
For example:
the three containers weighed a total 1.82 lb. after test:
0.32 lb. net
0.321.82 1.5–=
For example:
a 7.5in drill has 64 rows:
6.7 lbs/ac
0.32
---------
6.7
64×=
3
15. The Seed Rate Handle scale is a percentage of
meter opening, and is quite linear near scale center.
Calculate a new scale setting based on the test.
TargetRate
NewScale
--------------------------------MeasuredRate
OldScale×=
Note: You may want to repeat calibration procedure if
your results varied greatly from the Seed Rate
Chart, or if you must operate near the ends of the
Seed Rate handle scale (0-20 or 90-100).
16. Set the center and left drill sections to match the
now-calibrated right section.
17. With calibration complete, Reinstall fertilizer chain (if
removed), and reconnect seed hoses.
When drilling, check seeding rate by noting acres drilled,
amount of seed added to drill and seed level in drill box.
If you are seeding more or less than desired, adjust rate
slightly to compensate for field conditions.
For example:
new scale:
48
8
------
48
6.7
40×=
196-522B01/29/2009
Page 25
Great Plains Mfg., Inc.
Small Seeds Rate Charts, U.S. Customary Units
See page 21 for instructions.Metric charts begin on page 33.