Airbox operation, Fan operation – Great Plains YP3025 Operator Manual User Manual
Page 52
48
YP3010HDP/3020P/3025
Great Plains Manufacturing, Inc.
401-703M
2013-09-09
Airbox Operation
Refer to Figure 51
The function of the airbox
is to mix seed with turbulent
air from the hydraulic fan
, which then exits through a
manifold (not shown) to the seed tubes which serve the
row unit meters.
Fan Operation
All three (3) fan hydraulic lines must be properly con-
nected. “Hydraulic Hookup” on page 15.
Use tractor remote hydraulic valve flow control to set
fan
speed. Start with a very low speed and verify that
fan impeller is spinning in the correct direction (toward air
exit port). Air moves toward the air box in either direction
of fan rotation, but reverse spinning airflow is too low to
operate the air box.
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. A fan speed too high creates too much
air flow causing seed to plug up the meter box. Fans
operating too slowly 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 oper-
ate suitably with fan speeds between 3000-4500 rpm,
refer to the troubleshooting chart, and then adjust the fan
butterfly valve. See “Fan Adjustments” on page 56.
Watch monitor and adjust fan speed by increasing or
decreasing hydraulic flow from tractor.
When starting empty you must blow seed out to the
meters for two to four minutes to fill meters.
The monitor has a level sensor below the hopper or seed
box to warn when seed box is empty. There are three to
four acres of seed in the system when the sensor first
indicates box empty, depending on seeding rate.
3800 rpm 82bu hopper
150bu hopper
3500 rpm bulk seed boxes
Note: Do not apply pressure to the return line or operate
with restricted return line, or motor seals will be
damaged.
Note: Before the first planting each season, or when
using new meters or meter wheels for the first
time, or at the start of each season, before filling
with seed, add
1
⁄
3
cup (80 ml) graphite to bottom
of airbox.
Figure 51
Fan and Air Box
29309
1
2
1
2
2