Great Plains YP2425F-2470 Operator Manual - Manual (Page 62)

58 YP2425 & YP2425F Table of Contents Index Great Plains Manufacturing, Inc.
401-406M Table of Contents Index 2014-07-14
Fan Adjustments
Fans on PTO
For fans powered by an optional PTO kit (page 109), the
fan speed is set at the kit’s flow control valve. See
manual 411-015M for details.
Fans on Hydraulic Remotes
Refer to Figure 67
There are three butterfly valves at the fan outlet:
common,
left air box, and
right air box,
Recommended butterfly valve setting is 0 ° for all three
valves. Recommended fan speed depends on planter
configuration:
Adjust the basic fan rate with the tractor hydraulic system
and the fan rpm display of the seed monitor. Do not run
the fan at speeds over 4500 rpm or speeds under
3000 rpm.
A fan operating at too high a speed creates too much air
flow causing seed to plug up the meter box, and meters
to run empty. A fan operating too slowly does not create
enough air flow to push the seed to the meter, causing
meters to run empty. If air system does not operate
suitably with fan speeds between 3000-4500 rpm, refer
to the troubleshooting chart, and then adjust the fan
butterfly valve only as needed.
Normally, each seed meter will be full of seed, up to the
top of the bypass screen at the base of the inlet neck. If
the meter has less seed, check for blockage upstream. If
there is no blockage, check for insufficient fan airflow: low
rpm and/or butterfly valve(s) at too high an angle.
The butterfly valve may be helpful if your tractor can
maintain a high, but irregular fan rpm. Set left/right
valves
/ to 0 °. Set the rpm to above 3800 rpm with
valve completely open (0 ° ). Adjust valve angle in
the 20 to 30
° range until you achieve the desired seed
flow consistency. Adjust valve or (but not both) only
to balance airflow.
3800 rpm planter using 2007+ 82 bu. or 150 bu.
hoppers (or older hoppers with the vent line
update)
3500 rpm planter using bulk seed boxes or unvented
hoppers
Note: The YP2425F has two fans. See manual
403-362M for operational details.
Figure 67
Fan Butterfly Valves
27386
1
3
2
1
2
3
2 3
1 1
2 3