Great Plains NTA2007HD Operator Manual - Manual (Page 87)

Great Plains Manufacturing, Inc. Contents Index Adjustments 83
04/04/2011 Contents Index 166-283M
Adjusting Fan Speed
Start with the rpm settings in the table on page 82.
Adjust for your situation.
Start with flow on low setting. 30-45 liters/min (8-12 gpm)
is average flow.
Run fan for at least 15 minutes before seeding. Hydraulic
fluid must be warm before fan and wing pressure sys-
tems operate properly.
1. Check bin-lid and meter-box seals for air leaks.
Adjust the latch or replace the seals to prevent leak-
age.
Note: It only takes a very small air leak to cause large
variations in the seeding rate and pattern.
2. Watch the manifold pressure gauge(s) and seed
monitor, and adjust fan speed by increasing or
decreasing hydraulic flow from the tractor. Use the
guidelines and the fan speed chart on page 82 to
properly adjust fan speed.
Fan Speed Tips
• Higher fan speeds improve seed distribution, but high
fan speeds also increase the chance of seed damage
and bounce.
• At first, adjust fan speed to the high end of the range
suggested in the chart on page 82. Watch for exces-
sive seed cracking and seed bounce from the furrow,
then reduce fan speed if necessary.
• Follow the chart at right as a guide. Actual fan speeds
vary with implement width, row spacing, seeding rates,
seed weights and seed size. Increase fan speed for
heavier seeding rates or seed. Reduce fan speed for
lighter seeding rates and seed more prone to cracking.