Great Plains YP1625 Operator Manual - Manual (Page 43)

Great Plains Manufacturing, Inc. Operating Instructions 39
03/12/2012 401-226M-A
Airbox Operation
The function of the airbox is to mix seed with turbulent air
from the hydraulic fan, which then exits through a mani-
fold to the seed tubes which serve the row unit meters.
Fan Operation
Three (3) hydraulic hoses serve the fan, and must be
properly connected. See “Hydraulic Hose Hookup” on
page 13.
The fan must hook up to the case drain line first, and it
must be operated with the return oil line connected to a
low back pressure sump return on the tractor. Check with
tractor manufacturer for proper connection of oil sump
return line. A low back pressure quick disconnect is sup-
plied with the planter for ease of connection to the tractor
sump return line.
Motor Seal Damage Risk:
Do not apply pressure to the return line or operate with
restricted return line or motor seals will be damaged.
Use tractor remote hydraulic valve flow control to set fan
speed. Start with flow on low setting.
8 - 12 gpm (30-45 liters/min) is average flow.
Recommended butterfly valve setting is 0 °. Recom-
mended fan speed depends on planter configuration:
Do not run the fan at speeds over 4500 rpm or speeds
under 3000 rpm. Fans operating at too high a speed cre-
ate too much air flow causing seed to plug up the meter
box. Fans operating at too low a speed do not create
enough air flow to push the seed to the meter causing
the seed tube to plug or meters to run empty.
If air system does not operate suitably with fan speeds
between 3000-4500 rpm, see “Airbox Troubleshooting”
on page 76, and then “Fan Adjustments” on page 50.
When starting empty you must blow seed out to the
meters for two to four minutes to fill meters.
Note: Before corn planting for the first time at the start of
each season, add
1 ⁄
3
cup (80 ml) graphite to bottom
of airbox.
Watch monitor and adjust fan speed by increasing or
decreasing hydraulic flow from tractor.
The monitor system includes a level sensor located
below hopper to warn when box is empty. This typically
provides three to four acres (1.2 to 1.6 ha) of run time
before rows start going empty.
3800 rpm Planters using 2007+ 82bu or 150bu hoppers
(or older hoppers with the vent line update)
3500 rpm 2006- planters, or any planter using bulk seed
boxes or unvented hoppers
FigureSpacer:
Figure 47
Fan Butterfly Valve
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FigureSpacer:
Y-Tubes
Refer to Figure 48
Y-tube gates can be shut off to feed only one row for
planting 30in corn on 15in machines. Corn rows are the
rear set rows.
You can also shut off the Y-tube gates to clean out the air
system and meters. See “Air System Clean-Out” on
page 79.
Figure 48
Y-Tube
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