Great Plains YP1625 Operator Manual - Manual (Page 48)

44 YP1225 and 1625 Great Plains Manufacturing, Inc.
401-226M 07/09/2009
Ground Drive Pump
On new and upgraded planters, the pump is driven by
a ground contact wheel , and fertilizer rate is indepen-
dent of seed rate. Fertilizer rate is set by sprockets on
the ground drive assembly.
Refer to Figure 45
For sprocket settings, see the Seed Rate manual.
Fan Adjustments
Recommended fan butterfly valve setting is 0 ° . Recom-
mended fan speed depends on planter configuration:
Adjust the basic fan rate with the tractor hydraulic system
and fan rpm display on seed monitor. Do not run the fan
over 4500 rpm or under 3000 rpm.
Fans operating at too high a speed create too much air
flow causing seed to plug up the meter box. Fans operat-
ing too slowly do not create enough air flow to push the
seed to the meters, causing the seed tube to plug. 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.
The butterfly valve may be helpful if your tractor can
maintain a high, but irregular fan rpm. Set the rpm to
above 3500 rpm with the valve completely open (0
° ).
Adjust the valve angle in the 20-30 ° range until you
achieve the desired seed flow consistency.
Figure 45
Ground Drive Pump Sprockets
25319
3
1
2
3
1
2
3
3800 rpm 2007+ 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
Figure 46
Fan Butterfly Valve
25267