Great Plains YP3025 Operator Manual - Manual (Page 60)

56 YP3010HDP/3020P/3025 Table of Contents Index Great Plains Manufacturing, Inc.
401-703M Table of Contents Index 2013-09-09
Fan Adjustments
Refer to Figure 59
There is one butterfly valve
at the fan outlet:
The recommended butterfly valve setting is 0 ° . Recom-
mended 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 suit-
ably with fan speeds between 3000-4500 rpm, refer to
the troubleshooting chart, and then adjust the fan butter-
fly 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 at too high an angle.
The butterfly valve may be helpful if your tractor can
maintain a high, but irregular fan rpm. Set the rpm to
above 3800 rpm with valve
completely open (0 ° ).
Adjust valve angle in the 20-30 ° range until you achieve
the desired seed flow consistency.
3800 rpm 82bu hopper
150bu hopper
3500 rpm bulk seed boxes
Figure 59
Fan Butterfly Valve
29313
1
1
1