Great-plains PT8030 V1015 Operator Manual User Manual download pdf (Page 19)

Section 3 Adjustments

4/12/05

PT6030 and PT8030 Pull-Type Planter 401-032M-B

Great Plains Mfg., Inc.

Section 3 Adjustments

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 30-inch rows, measure 17 feet 6 inches (one-thou-

sandth of an acre).

6. Count the number of seeds in one row over the mea-

sured distance.

7. Multiply the number of seeds counted by 1000. This

gives you total population.

Example

• 30-inch row spacing

• Measure 17 feet 6 inches

• 24 seeds over measured distance in one row

24 X1000 = 24,000 plant population per acre

If the planting population is signiﬁcantly different than de-

sired, make the following checks.

• Double check the sprocket combination in the trans-

mission. Refer to Planting Rates for Corn Meters,

page 18, or Planting Rates for Brush Meters, page 19.

• Check air pressure in the gauge-wheel tires. Refer to

Tire Inflation Chart, “Appendix,”

page 56.

• Check for meter malfunction or excessive contact-

drive-wheel slippage. Refer to “Troubleshooting,”

page 34.

Planting Rate

Transmission Adjustment

To change the planting population, change the sprocket

combination on the transmission.

1. Refer to Planting Rates for Finger Pickup Corn

Meters,

page 18, or Planting Rates for Brush Meters,

page 19, for proper sprocket combination for your de-

sired planting population.

2. Remove cover from transmission by loosening knob

on cover. See

Figure 3-2.

3. Loosen carriage bolt and ﬂange nut on idler plate. Ro-

tate 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.

2-to-1 Drive Reduction

The charts on page 18 and page 19 are based on a 15-

tooth, driven sprocket in the contact-wheel drive. To re-

duce planting rates by one-half, switch to 28-tooth sprock-

et. See Figure 3-1.

16863

Figure 3-1

2-to-1 Drive Reduction

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 58 59

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Great-plains PT8030 V1015 Operator Manual User Manual Page 19

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