Great Plains YP1220 Operator Manual - Manual (Page 37)

Great Plains Manufacturing, Inc. Operating Instructions 33
03/14/2012 401-506M
Airbox Operation
The function of the airbox is to carry seed to the meter
where seed is blown to the row spacings.
Fan Operation
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.
Use tractor remote hydraulic valve flow control to set fan
speed. Start with flow on low setting. 8 - 12 gpm is aver-
age flow.
Note: Do not apply pressure to the return line or operate
with restricted return line or motor seals will be
damaged.
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. If air system does not operate suit-
ably with fan speeds between 3000-4500 rpm, see
“Troubleshooting” on page 50, and then “Fan Adjust-
ments” on page 42.
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 graphite to bottom of air-
box.
Watch monitor and adjust fan speed by increasing or
decreasing hydraulic flow from tractor.
The monitor has a level sensor located below hopper to
warn when box is empty. This gives three to four acres of
run time before rows start going empty.
Y-Tubes
Refer to Figure 34
Most rows are connected via Y-tubes with valves
.
These Y-tube gates can be shut off to increase the row
spacing of your planter.
Three rows are connected to fixed Y-tubes without valves
. These rows cannot be shut off at the Y-tube. Plan any
alternate row spacings to use these always-open rows,
or un-clamp and re-route seed hoses.
You can also shut off the valved Y-tube gates to clean out
the air system and meters. See “Cleaning Out Air Sys-
tem” on page 59.
3800 rpm using 82bu or 150bu hoppers
3500 rpm using bulk seed boxes (or legacy Great Plains
hoppers without the vent line update)
Figure 34
Y-Tubes
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