Great-plains 3S-3000F Operator Manual v2 User Manual download pdf (Page 40)

Section 3 Adjustments

3S-3000 Three-Section Folding Drill 195-110M-A 11/9/07

Great Plains Mfg., Inc.

Fertilizer Adjustment

The 3S-3000F has chain drives powered off the gauge

wheels to meter fertilizer. Adjust the application rate by

changing the drive sprockets.

Fertilizer application rates will vary with fertilizer type, den-

sity and particle size. Relative humidity and ﬁeld condi-

tions can also affect application rates. Initially set the rate

according to the charts, then calibrate the drill to your ma-

terial as described under Fertilizer Rate Calibration on this

page.

Fertilizer metering is controlled by separate sprocket sets

on each drill box. After setting and calibrating the metering

rate for one drill box, install the same sprockets on the re-

maining drill boxes.

1. Refer to the fertilizer rate charts on page 39 to ﬁnd

sprocket sizes for your drill and desired meter rate.

2. To switch between high and low range, loosen and

slide the idler sprocket out of the chain shown in Fig-

ure 3-5. Remove the lynch pin from the end of the

shaft and install correct sprocket.

• For high range, install the 16-tooth sprocket and

shorten the chain by removing a 16-pitch strand.

• For low range, install the 44-tooth sprocket and

lengthen the chain by reinstalling the 16-pitch

strand.

Move idler sprocket back into place. Chain should

have 1/4-in. slack.

Hi/Low Range Sprocket

Figure 3-5

3. To change the driver/driven ratio, refer to Figure 3-7.

Loosen and slide idler sprockets out of the chain. Re-

move the lynch pins from the shafts. Place the correct

sprockets on the shafts. Store sprockets not used. Re-

install chain and slide idlers back into place. Chain

should have 1/4-in. slack.

IMPORTANT: The fertilizer meter rate charts are for

granular fertilizer with a density of 65 pounds per cubic

foot. If you are applying fertilizer with a different densi-

ty, use the density conversion chart on page 39.

16379

16T/44T

Driver/Driven Sprockets

Figure 3-6

NOTE: The driver and driven sprockets must be next to

the shaft bearings. Use the end of the shafts to store

sprockets not used.

Fertilizer Rate Calibration

The charts on page 39 are based on fertilizer with average

particle size and a density of 65 pounds per cubic foot. Dif-

ferences in particle size, density and shape can cause

wide variations in actual metering rates. Tire pressure and

ﬁeld conditions can also affect metering rates.After setting

the rate as described under Fertilizer Adjustment, com-

plete the following procedure to calibrate your drill.

1. Raise the drill with the tractor hydraulics so the gauge

wheels are off the ground. Rotate the gauge wheels to

see that the metering system is working properly and

free from foreign material.

2. Check that your gauge-wheel tires are 9.5L x 15 and

properly inﬂated. Refer to Tire Inﬂation Chart,“Ap-

pendix,” on page 64. Place several pounds of fertilizer

over three fertilizer feed cups on the outside end of the

drill box. Pull the fertilizer tubes off of these three disk

openers.

3. Place a container under the three tubes to gather me-

tered fertilizer.

4. Turn the gauge wheel 175 rotations until one acre has

been tallied on the acremeter. Checkthat the three feed

cups have plenty of fertilizer coming into them.

5. Weigh the metered material. Divide by three. Multiply

by the number of openers on your drill to determine to-

tal pounds-per-acre metered. If this ﬁgure is different

than desired, reset sprockets accordingly.

NOTE: You may want to repeat the calibration procedure if

your results vary greatly from the meter rate chart.

6. When satisﬁed with the metering rate, install the same

range, driver and driven sprockets on each drill box.

7. When drilling, check the rate by noting acres drilled,

amount of fertilizer added to drill and level of material

in drill box. If you are applying more or less than de-

sired, adjust the metering rate slightly to compensate

for ﬁeld conditions.

iver

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Great-plains 3S-3000F Operator Manual v2 User Manual Page 40

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