Great-plains NTA2007HD Operator Manual User Manual download pdf (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.

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Great-plains NTA2007HD Operator Manual User Manual Page 87