Operating instructions

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Great Plains Manufacturing, Inc. Table of Contents Index Troubleshooting 69

2015-01-26 Table of Contents Index 401-652M

Overall High

Population,

cont.

Air pressure too high, but gauge is within

range or reading low.

Check:

• Inspect the

⁄

inch sample lines from the row units up

to the sensor chamber for leaks (page 66).

• Make sure all non-planting rows have blank disks

(page 59).

• Check that rubber pressure relief plug is seated in

gauge (page 66).

False alarms or actual seed rate errors

due to monitor setup with incorrect row

count, spacing or active rows

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).

Incorrect speed sensor constant. Perform speed calibration per seed monitor manual.

Incorrect magnetic speed sensor gap. Check and adjust (page 79).

(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 115).

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