5
Seed Calibration
5/2/06
EWD13 and EWF13 Sprocket Box Update 152-208M
Great Plains Mfg., Inc.
Set Seed-Rate Handle
The position the handle shown in Figure 1-10 to the setting indi-
cated on the chart. To adjust the handle, loosen the wing nut un-
der the handle and slide until the indicator lines up with the
correct setting.
12927
Figure 1-10
Seed-Rate Handle
Position Seed-Cup Doors
For wheat and other small seeds, move the seed-cup-door han-
dles to the highest position. For soybeans and other large seeds,
lower the handles to the second position. If excessive seed
cracking occurs, lower the handles to the third position. Move the
handles to the fourth, wide-open position for seed-cup clean out.
Make sure all handles are in the same position before drilling.
13867
Figure 1-11
Seed-Cup-Door Handle
Check Seeding Rate
1. Hydraulically lower the drill to planting position to activate
clutch.
2. Check that your gauge-wheel tires are 9.5 x 20 rib imple-
ment and properly inflated. Refer to Tire Inflation Chart in
your operator’s manual.
3. Jack the drive (left) end wheel off the ground. Rotate the
wheel to see that the drive system is working properly and
seed cups are free from foreign material.
4. Record the weight of an empty container large enough to
hold the seed metered for one acre.
5. Place several pounds of seed over three seed cups on an
outside end of the drill box. Pull the seed tubes off of these
three openers.
6. Turn the drive wheel several times to fill the seed cups. Turn
wheel until seed drops to the ground from each seed cup.
7. Place a container under the three tubes to gather metered
seed.
8. Rotate the drive wheel until one acre has been tallied on the
acremeter. This will be 348 rotations on a 13-foot drill. Check
that the three seed cups have plenty of seed coming into
them.
9. Weigh the metered seed. Subtract the initial weight of the
container. Divide by three. Multiply by the number of open
-
ers on your drill to determine total pounds-per-acre seeded.
If this figure is different than desired, reset sprockets accord
-
ingly.
NOTE: You may want to repeat the calibration procedure if your
results vary greatly from the seed-rate chart.
10. When drilling, check the 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 the rate slightly to
compensate for field conditions.
(72 pages)
(46 pages)
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