Great Plains 80403P Operator Manual - Manual (Page 16)

8-Row 36", 38", 40" & 10-Row 30" 3-Point Wide Row Planter 401-020M 8/1/01 14 Great Plains Mfg., Inc.
Section 4 Adjusting Planting Rates
This section discusses the adjustments and settings for
seeding and chemical rates.
Planting Rates
Please read the following sections. Complete under-
standing of this process will help to prevent problems.
Transmission Adjustment
Planting population changes are accomplished by set-
ting the sprocket transmission. By changing the
combination of sprockets the desired planting popula-
tions can be achieved.
To change the sprocket combination, do as follows:
1. Select the sprocket combination for your planting pop-
ulation from the" Planting Rates for Finger Pickup
Corn Meter Chart" in this section on page 21 and 22.
2. Remove the cover from the transmission by loosen-
ing the knob on the cover.
3. Release the spring tensioner on the idler,
see Figure 4-1.
4. Remove the chain and sprockets.
5. Exchange the sprockets with the desired sprockets,
selected in step 1, on the storage bracket.
6. Place the sprockets on the drive/driven shafts ac-
cording to the " Planting Rates for Finger Pickup
Corn Meter Chart" in this section on page 21.
7. Loop the chain over the sprockets and between the
2 idlers.
8. Turn the idler plate counter-clockwise (ccw) to take
up the slack. Hook the spring onto the idler plate Ro-
tate the tensioner over center. If the chain is too
loose, hook the spring onto the next notch in the
plate.
9. Replace the transmission cover and hand tighten
the knob.
Checking Planting Population
After setting the transmission, ALWAYS check the plant-
ing population in the field.
Follow these steps to check the planting population:
1. Tie up 1 or more closing disks or wheels with a chain
or heavy wire to the hopper support. Releasing the
spring pressure on the disks and wheels will make
this easier. Adjust the planting depth to a shallow
setting. It may be necessary to tie up the seed lok
wheels so that the seeds are easier to find.
2. Plant at a normal speed for a short distance.
Note: When not in use, keep all extra sprockets on the
storage bracket. 3. Measure 1/1000 of an acre. Refer to table below for
conversions.
4. Multiply the number of seeds counted by 1000. This
gives you total population.
Spring Tensioner on Transmission
Figure 4-1
12349
Row Planter 1/1000 of an Acre
40" 13’ - 1"
38" 13’ - 9"
36" 14’ - 6"
30" 17’ - 6"
Section 4
Adjusting Planting Rates