Drive-wheel slippage may cause actual rates of seed or fertilizer to differ from delivery rates shown on the rate charts.

While a certain amount of wheel slippage is normal, excessive drive-wheel slippage may cause undesirable changes in actual rates.

The rates shown in the rate charts are based on approximately 6 percent drive wheel slippage.

Excessive drive-wheel slippage may be caused by binding, poorly lubricated parts or misaligned bearings.

Down pressure attachments, coulters, row tillage attachments, or any other attachment that removes weight from drive wheels, may contribute to drive-wheel slippage and lower than expected rates.

Tire air pressure will affect slippage. Low air pressure will result in higher seeding rates. See CHECKING TIRE INFLATION in Preparing Machine section.

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To calculate the amount of drive-wheel slippage proceed as follows.

NOTE: Centerframe and wing frame wheels are different sizes. If wing wheel revolutions are counted, the percentage of wheel slip calculated will be wrong.

2. Mark a CENTERFRAME drive wheel with a rubber hold-down strap, reflective tape or duct tape. This will help to count wheel revolutions.

3. Drive the 96 m (315 ft) course in actual field conditions, at normal planting speed, with all desired planter functions actually operating.

4. Have another person count drive-wheel revolutions from behind machine.

5. Subtract counted number of revolutions from 30. Divide this difference by 30. Multiply result by 100.

EXAMPLE:

If 28 wheel revolutions are counted, subtract 28 from 30.

30 - 28 = 2

Divide 2 by 30.

2 ÷ 30 = 0.066

Multiply 0.066 by 100.

0. 066 x 100 = 6. 6

There is 6.6 percent drive wheel slippage.

If drive-wheel slippage is greater than or less than 6 percent (baseline slippage), adjust seed transmission to obtain desired population.

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