Great Plains
| 401-647M | 2019-06-11
Table of Contents
Index
94
3PYPA
Table of Contents
Index
Troubleshooting
Overall High
Population,
cont.
Sticky seeds: excess seed treatment
Increase seed lubricant.
Speed sensor angle.
With planter lowered, check radar speed sensor angle per
DICKEY-john
®
recommendations.
Incorrect speed sensor constant
Perform speed calibration per DICKEY-john
®
monitor manual.
Overlapping passes
Check marker extension (page 170).
For GPS, check planter size programmed.
Actual field size is different
Population may be correct, and calculations are not.
High
Population,
Single Row
Excess meter pressurization causing
doubles
Check shutter.
Worn seed-drop brush and/or strip
brushes allowing excess seed to pass
Replace worn brushes.
Incorrect seed disk with higher cell
count.
Install correct disk.
Problem
Cause
Solution
Problem
Cause
Solution
Overall
Population
Alarms
False alarms or actual rate errors due
to monitor setup with incorrect [active]
row count or spacing
When troubleshooting population issues, always first rule out seed
monitor setup. Review planter configuration and monitor setup.
Incorrect cell count
Replace seed disks with correct disks, or reset rate for current disks
(if within range).
Improper gap on speed sensor.
Check speed sensor on planter for
1
/
16
inch to
1
/
8
inch
(1.6 to 3.2 mm) gap from wheel. Improper gap can cause erratic
speed signal causing monitor to falsely report improper planting rate.
Incorrect speed sensor constant
Perform speed calibration per DICKEY-john
®
monitor manual.
Mismatch
Between
Reported and
Furrow
Population
Small seeds (example milo) are not
reliably sensed in the seed tube
Run with rain covers in place to minimize ambient light intrusion. Use
the population adjustment factor in the Dickey John monitor system
to compensate for missed seeds. For example, change the
DICKEY-john
®
Population Adjustment values from 100% to 130% or
140% as needed. Remember to set this back to 100% for large
seeds.
Seed tube sensor is not counting all
seeds
Clean the seed tube of graphite and dust buildup with long narrow
seed tube brush. Replace sensors that malfunction.
Seeds / revolution value in the
DICKEY-john
®
setup does not match
the disk cell count.
Correct the value in a setup screen or install the correct cell count
disc.
Excessive Seed
Cracking
Incorrect seed pocket size
Use correct disk for seed.
Damaged, old or dried-out seed
Use new seed.
Unclean seed
Use clean seed.
Skips and Bare
Spots After
Turns
Fan was turned off at turns
Leave fan running. Meter Pressurization must be maintained during
turns, or seed will fall out of disk pockets.
Insufficient hydraulic flow to keep fan
running at speed required to maintain
meter pressurization
Check tractor capability against requirements (page 141).
If sufficient:
•
Fold markers before engaging lift.
•
Use a less aggressive lift rate.
•
Monitor fan rpm during end-of-pass operations.
Unable to
adjust air
pressure low
enough.
Lower limit reached in DICKEY-john
®
software.
At User Level 2, reduce the controlled air lower limit in the software.
Fan speed too high, vane rotated to
maximum.
Reduce the fan speed.
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