3P3025AH
Adjustments
Great Plains
| 411-332M | 2019-02-19
53
Planting Rate
Details, AI-120 Monitor
Refer to the
Seed Rate Manual
. Refer to the
DICKEY-john Planter Monitor operator manual for the
AI-120 monitor. See “
part numbers of the manuals.
Fan and Adjustment
1. These steps presume that correct seed discs are
installed (per
Seed Rate Manual
), and the seed inlet
shutters are set for the seed (page 71).
2. With fan off, check Meter pressurization reported by
the Magnehelic
a
gauge. Re-zero as needed.
3. Determine the recommended Meter pressurization
based on your own notes or the published value in
the
Seed Rate Manual
.
4. Put tractor in Park and set brakes. Set tractor engine
speed to typical field rpm. Lift planter.
5. Start the fan. Gradually increase fan speed using the
tractor’s hydraulic flow control for the circuit. Using
hydraulic flow, adjust Meter pressurization to the
developed or suggested value from step 3.
6. Rotate ground drive wheel to fill meters. Meters are
filled when seed begins emerging below two or more
openers. With fan running, put the tractor in Park and
set the brakes. Walk behind the wings, remove
several rain covers, and check for seed in meters by
looking through the clear discs.
7. Re-check Meter pressurization. With meters and
discs filled, air loss through empty disc pockets is
reduced, and meter pressurization can change.
8. Begin planting. Troubleshoot any obvious problems
or optional planter monitor alarms.
a. Magnehelic is a registered trademark of Dwyer Instruments, Inc.
Figure 51
AI-120 Monitor Screen
68094
1
Figure 52
Magnehelic Gauge
29842
Re-zero the Magnehelic gauge on level ground with the fan
off, and if possible, under no-wind conditions. Turn the set
screw
on the meter face until it reads zero from the tractor
driver’s viewing position.
Port ID for Troubleshooting:
Over-pressure relief port (with plug in place)
Low-pressure port (breather/atmospheric pressure)
High-pressure port (from manifold chamber)
3
2
4