Great-plains YP825AR Operator Manual User Manual download pdf (Page 60)

56 YP825AR Table of Contents Index Great Plains Manufacturing, Inc.

401-923M Table of Contents Index 2014-06-17

Fan and Gauge Adjustment

1. These steps presume that correct seed disks are

installed (per Seed Rate Manual), and the seed inlet

shutters are set for the seed (page 74).

2. With fan off, check meter pressurization reported by

the Magnehelic

®a

gauge. If not zero, re-zero as

needed.

3. Determine the recommended meter pressurization

based on your own notes or the published value in

the Seed Rate Manual.

4. Put tractor in Park and set brakes. Set tractor engine

speed to typical ﬁeld rpm. Lift planter.

5. Start the fan. Gradually increase fan speed using the

tractor’s hydraulic ﬂow control for the circuit, or in the

case of a PTO pump, using the PTO ﬂow control.

Using hydraulic ﬂow and/or the butterﬂy valve, adjust

meter pressurization to the developed or suggested

value from step 3.

If the planter has PTO hydraulic drive (presently off),

check the fan rpm on the seed monitor. Increase

hydraulic ﬂow to raise fan speed by 150 rpm. The fan

loses 150 rpm when hydraulic drive is engaged.

6. Rotate ground drive wheel to ﬁll meters, or perform a

FILL DISK operation with hydraulic drive. Meters are

ﬁlled when seed begins emerging below two or more

openers. With fan running, put the tractor in Park and

set the brakes. Walk behind the openers, remove

several rain covers, and check for seed in meters by

looking through the clear disks.

7. Re-check meter pressurization. With meters and

disks ﬁlled, air loss through empty disk pockets is

reduced, and meter pressurization can change.

8. Begin planting. Troubleshoot any obvious problems

or optional seed monitor alarms.

9. During the ﬁrst pass, take note of the average

populations reported on the seed monitor. If the

reported seed monitor population varies from your

intentions by a signiﬁcant amount, it is imperative to

perform a furrow check.

For serious variances with no obvious cause, see

“Population Troubleshooting Charts” on page 86.

If the population is only slightly low, the problem can

be skips (periodic empty disk pockets). If slightly

high, the problem can be doubles (period pockets

with double seed). An adjustment to the meter

pressurization may correct either condition (see

step 14).

Note: Small seeds, such as Milo, may be under-reported

by the seed monitor. Use the “Alternate Skip/

Double Check” below to verify seed status at the

disc pockets.

10. Resume planting.

A small varying population deviation between rows is

normal. If a row is consistently running lower or

higher than the other rows, it could indicate a meter

or seed sensor problem that needs attention.

“Population Troubleshooting Charts” on page 86.

11. Continue to monitor meter pressurization.

When oil reaches operating temperature, fan speed

can change. Expect to make periodic adjustments to

fan circuit or butterﬂy valve to maintain ideal meter

pressurization.

Furrow Check:

12. Expose several seeds in each of several rows, being

careful not to disturb their relative positions. Measure

and average the distance between seeds. Compare

this to the predicted seed spacing for the population

in the Seed Rate Manual.

13. Any instances of no seed where expected may be a

sign of “skips”. Finding two seeds at the same spot is

clear indication of “doubles”

a. Magnehelic

is a registered trademark of Dwyer Instruments, Inc.

Figure 54

Magnehelic

Gauge

29842

Port ID for Troubleshooting:

Over-pressure relief port (with plug in place)

Low-pressure port (breather/atmospheric pressure)

High-pressure port (from manifold chamber)

Re-zero the Magnehelic

gauge on level ground with

the fan off, and if possible, under no-wind conditions.

Turn the set screw on the meter face until it reads

zero from the tractor driver’s viewing position.

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Great-plains YP825AR Operator Manual User Manual Page 60

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