Great Plains NTA2007HD Operator Manual - Manual (Page 61)

Great Plains Manufacturing, Inc. Contents Index Operating Instructions 57
04/04/2011 Contents Index 166-283M
Fan General Information
The hydraulic fan supplies the air stream that carries
materials from the meters, through the primary hoses to
the towers, then to the secondary hoses to the rows.
The fan needs to be running in the correct direction, and
within a narrow speed range, to reliably deliver material
at your calibrated rates.
The fan shares its hydraulic circuit with the implement
fold/down-pressure/weight-transfer system. This has
several considerations:
• (see decal left panel) The fan is on during field opera-
tions, with the down-pressure and weight transfer cir-
cuits active. If planting on very uneven ground, you
may observe some minor fluctuation in fan rpm, as the
implement circuits demand oil.
• (see decal right panel) The fan must be shut off during
fold and unfold operations (page 30).
• The fan must be off for calibration (page 52).
• The fan may be on when the implement is folded and
locked (page 33), for air system clean-out (page 109).
Machine Damage Risk:
Always engage the fan with the tractor at a low engine speed.
Engaging the fan when the tractor is at high speed may cause
fan damage.
Do not reverse hydraulic flow with the fan running.
Note: If the fan plumbing or hitch hookup is reversed, air
flow rate will be very low or zero. If you are unable
to reach 3000 rpm, check hose connections.
Note: Fan speed is monitored and reported by the seed
monitor, but is manually controlled. The optimum
rate depends on the seed type and any treatments.
“Fan Speed Suggestions” on page 82 for further
information.
Null4:
Figure 53
Manifold Pressure Gauges
31189