Air and seeding system overview – Great Plains YP625PD Operator Manual User Manual

Page 32

YP625PD

Table of Contents

Index

Great Plains Manufacturing, Inc.

401-754M

Table of Contents

Index

02/23/2011

Air and Seeding System Overview

Refer to Figure 22, on page 27, and Figure 23.
The hydraulic fan

supplies air exclusively for meter

operation. Fan rpm is operator-adjusted (page 30),
normally via the tractor circuit’s hydraulic flow control.

A manually-adjusted butterfly valve

is provided at the

fan outlet. See page 30 for valve adjustment.

The manifold system

delivers fan air across the

planter. It includes passive internal design features to
balance pressure across the planter.

Separate pressurization tubes

route manifold air to

each row unit.

Seed is delivered from the seed box

by gravity

through the sliding seed tubes

, to the inlet of the

Air-Pro

seed meter

A manually adjusted inlet shutter

controls the size of

the seed pool

at the base of the meter. The shutter

also minimizes air loss back up the seed inlet tube, and
is also used during row shut off. See page 54 for shutter
adjustments.

At the meter, pressurization air exits the meter through
the seed pockets

of the disk, and holds seed in the

pockets until released above the seed tube

In the seed tube, the seed sensor

detects passage of

seeds. Medium size and large seeds are counted
individually. With smaller seeds, most are detected,
allowing the monitor to detect stoppages.

Several rows have a pressure sensor port

for the

meter pressurization system. A line

from each of

these rows is connected to a chamber

to average the

pressures.

The averaged pressure is reported by a Magnehelic

®a

gauge

visible to the tractor operator. See page 41 for

use of the gauge in making fan adjustments.

A sensor

in each seed tube reports seed passage to

the seed monitor. Larger seeds are counted individually.
For smaller seeds, the system acts as a blockage
monitor.

Note: Use of the special blank disk (page 58), and closing

the seed inlet shutter (page 54), are particularly
important when a sensor row is shut off.

Note: On any row, running a normal disk with no seed, or

with an open empty inlet, unbalances the air
system. Doing either at a sensor row causes the
gauge to mis-report as well.

a. Magnehelic

is a registered trademark of Dwyer Instruments, Inc.

Note: Do not operate in the ground with the fan shut off,

or with insufficient manifold pressure. The meters
will completely fill with seed. Meter clean-out may
be required to resume normal operation.

Figure 23

Air-Pro

Meter, Disk Side

31040