2018-07-23
401-652M
YP-425, 625, 825, & 1025-A3P
Troubleshooting
76
Overall High
Population,
cont.
(Option) Incorrect radar speed sensor angle.
With planter lowered, check radar speed sensor angle per
DICKEY-john
®
recommendations.
Doubles due to incorrect disk for crop or seed
size
Use recommended disk for crop and seed size.
Sticky seeds: excess seed treatment
Increase seed lubricant.
Incorrect speed sensor constant
Perform speed calibration per DICKEY-john
®
monitor manual.
Overlapping passes
Check marker extension (page 119).
For GPS, check planter size programmed.
Actual field size is different
Population may be correct, and calculations are not.
Seed 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 disk
wobble and doubles
Replace meter bearing.
Incorrect seed disk with higher cell count.
Install correct disk.
Population Too High
Problem
Cause
Solution
Population Related
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 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 monitor to falsely report improper
planting rate.
Incorrect speed sensor constant
Perform speed calibration per 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 seed 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 disk for seed.
Damaged, old or dried-out seed
Use new seed.
Unclean seed
Use clean seed.
