Great Plains PD8070 Operator Manual - Manual (Page 22)

PD8070
401-266M 1/24/2006
20
Adjustments
Planting Rate
Transmission Adjustment
To change planting population, change sprocket combi-
nation on transmission.
1. Refer to the chart on page 21 for proper sprocket
combination for desired planting population.
Refer to Figure 9
2. Loosen knob to remove cover from transmission.
3. Loosen carriage bolt and flange nut on idler plate.
Rotate idler plate and move idlers out of chain.
4. Remove chain. Place correct sprockets for desired
planting rate on shafts. Store all unused sprockets
on storage bracket.
5. Reroute chain over idlers and sprockets.
6. Turn idler plate counterclockwise to take up all but
1/4-inch slack out of chain. Retighten carriage bolt
and flange nut on idler plate.
7. Replace transmission cover and hand tighten knob.
Checking Planting Population
After setting transmission, always field check planting
population as follows.
1. Release spring pressure on closing wheels or
disks.
2. Tie up closing disks or wheels to hopper support
using a chain or heavy wire. Lock up optional Seed-
Lok wheels.
3. Adjust planting depth to a shallow setting.
4. Plant at a normal speed for a short distance.
5. For 70cm, measure 14.29m (thousandth of a hect-
are).
6. Count the number of seeds in one row over the
measured distance. Multiply the number of seeds
counted by 1000. This is the total population.
If planting population is significantly different than de-
sired, make the following checks:
• Double check sprocket combination in transmis-
sion. Refer to page 21.
• Check air pressure in gauge wheel tires. Refer to
Tire Inflation Chart, “Appendix,” page 55.
• Check for meter malfunction or excessive con-
tact-drive-wheel slippage. Refer to “Trouble-
shooting,” page 34.
Figure 9 16861
Planter Transmission Drive and Driven Sprockets
• 70cm row spacing
• Measure 14.29m
• 24 seeds over measured distance in one row 24
x 1000 = 24,000 plant population per hectare
Example