3P3025AH
Troubleshooting
Great Plains
| 411-332M | 2019-02-19
85
Overall High
Population,
Cont.
Incorrect speed sensor constant.
Perform speed calibration per DICKEY-john monitor manual.
Overlapping passes.
For GPS, check planter size programmed.
Actual field size is different.
Population may be correct, and calculations are not.
Planter monitor under-reporting area.
Readings can vary with conditions (wheel slippage, and
effective rolling radius in soft soils) and planting patterns.
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.
Worn meter bearing causing seed disc wobble and
doubles.
Replace meter bearing.
Incorrect seed disc with higher cell count.
Install correct disc.
Overall
Population
Alarms
False alarms or actual rate errors due to planter
monitor setup with incorrect [active] row count or
spacing.
When troubleshooting population issues, always first rule out
planter monitor setup. Review planter configuration and
planter monitor setup.
Incorrect cell count.
Replace seed discs with correct discs, or reset rate for current
discs (if within range).
Improper gap on magnetic speed sensor.
Check speed sensor on planter for a gap to toothed wheel of:
1
/
32
inch (0.020-0.040 inch, 0.5-1.0 mm). Improper gap can
cause erratic speed signal causing planter monitor to falsely
report improper planting rate.
Incorrect speed sensor constant.
Perform speed calibration per planter monitor manual.
(Option) Incorrect radar speed sensor angle.
With planter lowered, check radar speed sensor angle per
DICKEY-john recommendations.
Seed run-out. Due to unequal outlets per box
division, and if planting across slopes, some rows
will run out before others.
Re-distribute seed to favor rows that have run out, and plan to
re-fill shortly.
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 scaling factor in the planter
monitor system to compensate for missed seeds. 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.
Excessive
Seed Cracking
Incorrect seed pocket size.
Use correct disc 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 disc pockets.
Insufficient hydraulic flow to keep fan running at
speed required to maintain Meter pressurization.
Check tractor capability against requirements (page 113).
If sufficient:
•
Fold markers before engaging lift.
•
Use a less aggressive lift rate.
•
Monitor Meter pressurization during end-of-pass
operations.
Seed too
shallow or
scattered on
ground from a
single row
Bottom of seed tube damaged.
Replace seed tube. Avoid setting planter straight down. Use
forward motion when lowering.
Row not penetrating in tire tracks.
Increase down force on parallel arm springs.
Opener depth too shallow.
Change side depth wheel setting.
Twin Rows
were timed but
became out of
time
Timing will change when a population change has
been made.
Re-time meters from the population based timing chart.
Chain has jumped.
Check sprockets and chain for excessive wear or rusty stuck
links.
Problem
Cause
Solution
