Great Plains CTA4000 Operator Manual - Manual (Page 33)

Operating Instructions 29
08/03/2010 160-269M-A
Fan Speed
This information is repeated from the air cart Operator’s
manual, which has additional guidance.
Fan speed is monitored and reported by the seed moni-
tor, but is manually controlled. The optimum rate
depends on the seed type and treatments. See “Fan
Speed Adjustment” in the cart Operator’s Manual for
further information.Recommended Fan Speeds
Refer to Figure 35
Open fan shutoff valve for fan operations.
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.
The proper reading for the magnehelic air pressure gauge is
12 to 25 inches of water. A sudden drop in pressure is a sign of
a possible leak which can adversely affect seeding.
Weight Transfer
While seeding, weight is hydraulically transferred from
the center section to the wings so all frame sections run
at the same depth.
This transfer happens automatically whenever the valve
block is set to FIELD operations, and the WT TRANS
valve has been set to any pressure above zero.
If insufficient weight is transferred, the wings will run
higher than the center section. If excess weight is trans-
ferred, the center runs higher. To make adjustments, see
“Adjusting Weight Transfer” on page 36.
Seeds Fan RPM
Sunflowers 2,250 - 3,000
Wheat 3,250 - 4,000
Soybeans 2,750 - 3,500
Milo 3,250 - 4,000
Figure 35
Fan Shutoff Valve Open
26418
Figure 36
Fan Air Pressure
26425
Figure 37
Handles for Weight Transfer
26372