John Deere Computertrak Guide

John Deere's ComputerTrak series was the standard planter monitoring system from the late 1980s through the 2000s, installed on thousands of 1700, 1750, 1770, 1780, 7200, and 7300 series planters. These monitors display seed population, spacing, and area planted — critical for catching skipped rows or blockages before they cost you yield.

If you're replacing a failed monitor, looking for a power supply, or trying to find a free manual, this guide covers every model in the lineup.

The ComputerTrak Model Lineup

John Deere released the ComputerTrak series in tiers. Here's what each model does:

ComputerTrak 100

The base model. Basic seed flow monitoring with individual row lamps and an audible alarm. No digital display — you read status from indicator lights. Uses a HI/LO toggle switch and tunable knob to set the alarm sensitivity. Compatible with 4, 6, 8, 10, and 12-row planters.

ComputerTrak 150

Upgraded from the 100 with the same lamp-based alarm system but improved tunable seed flow alarm. Individual row lamps show which rows are planting and which have stopped. One 3-amp fuse protects the circuit. This is the monitor you'll find on most late-80s to mid-90s MaxEmerge planters.

ComputerTrak 200

The 200 adds a digital display to the 100's lamp system. Shows seed population numbers, not just pass/fail lights. Includes area counting and speed display. This is the model most farmers want when upgrading from a 100 or 150 — you get actual numbers without paying for a 350.

Compatible planters: 1700, 1750, 1770, 1780, 7200, 7300 series.

ComputerTrak 250

The 250 is the digital upgrade to the 150. Full LCD display showing population, seed spacing, area planted, speed, and individual row data. Configurable for row count, row spacing, implement width, and distance calibration. Supports both English and metric units.

Key features:

Compatible planters: 1700, 1750, 1770, 1780, 7200, 7300 series. Also works with 1560 and 1565 grain drills.

ComputerTrak 300

The 300 is the export counterpart to the 250, covering the same feature set for international markets. Documented in the same manual as the 100 and 200.

ComputerTrak 350

The 350 is the full-featured LCD monitor for North American planters. Everything the 250 does plus population adjust (PA) charts for soybeans, fast average mode, and point row planting. The LCD shows population, spacing, speed, area, and individual row selection.

Compatible planters: 1700, 1770, 1780, 7200 series.

ComputerTrak 450

The top of the lineup. Identical features to the 350 — the 450 designation was used for certain planter configurations and regional variants. Same LCD display, same population/spacing/area/speed capabilities, same manual.

DICKEY-john DjPM Monitors vs ComputerTrak

The DICKEY-john DjPM series (DjPM 1000, DjPM 2000, DjPM 3000) are often confused with ComputerTrak monitors because they look similar and serve the same purpose. Here's the relationship:

DICKEY-john manufactured planter monitors under their own brand that were functionally equivalent to the ComputerTrak line. The DjPM 1000 is comparable to the ComputerTrak 100/150 (lamp-based, basic alarm), and the DjPM 2000 is comparable to the ComputerTrak 200/250 (digital display, population counting).

However, they are not the same unit and not interchangeable. The connectors, harnesses, and sensors are DICKEY-john proprietary. You cannot plug a DjPM 1000 into a John Deere planter harness without an adapter. Some farmers on AgTalk forums report using DjPM monitors on JD planters when they came as OEM equipment on certain configurations, but the harness must match.

If you have a DICKEY-john monitor and need parts, contact DICKEY-john directly (800-637-2952) or check with your local dealer — their part numbering system is completely separate from John Deere's.

Specifications Comparison

Feature100/150200/250300350/450
DisplayLamps onlyLCDLCDLCD
Population countNoYesYesYes
Seed spacingNoYesYesYes
Area plantedNoYesYesYes (2 counters)
Speed displayNoYesYesYes
HI/LO population warningTunable alarmAdjustable limitsAdjustable limitsAdjustable limits
Row selectionLamps onlyIndividualIndividualIndividual + MIN-AVG-MAX
English/MetricN/AToggleToggleToggle
Population Adjust (PA)NoNoNoYes
Monitor historyNoYesYesYes
Circuit protection3-amp fuse3-amp fuse3-amp fuse3-amp fuse
Distance sensorNoneRadarRadarRadar

Common Replacement Parts

Power Supplies

The ComputerTrak 200 uses a dedicated power supply module. If your monitor won't power on, this is the first thing to check — the power supply takes 12V from the tractor and regulates it for the monitor console.

Monitor Consoles

The full console unit is the most expensive replacement part.

Seed Tube Sensors

The optical sensors inside each row unit detect seed drop. Over time, dust and seed treatment residue build up on the sensor lens, causing false failures. Clean them with a soft brush or bottle brush.

Key part numbers:

Radar Ground Speed Unit

Provides ground speed to the monitor for area and population calculations. If speed reads zero, check the radar bracket and cable connection first.

Monitor Harness

Connects the console to the planter's row sensors. Inspect for rodent damage and pinched wires, especially at pivot points and where the harness crosses the drawbar.

Fuses

Where to Get Monitors Repaired

If your ComputerTrak monitor has a dead display, blown board, or power issue, you don't necessarily need to buy a replacement. These services specialize in agricultural electronics repair:

Ag Express Electronics

The best-known ag electronics repair service in the US. 30+ years repairing monitors, controllers, sensors, and wiring harnesses for all major brands including John Deere. They have a specific repair listing for the ComputerTrak 350 monitor.

Electronic Board Repair

Specializes in circuit board level repair for agricultural monitors including the ComputerTrak 250 control unit and seed monitor boards.

Industrial Electronics Repair

General industrial electronics repair that also handles John Deere boards and controllers.

Tip: Before sending a monitor in for repair, check the 3-amp fuse and power supply first. A $2 fuse or a failed power supply module accounts for a surprising number of "dead monitor" calls.

Troubleshooting Common Problems

Monitor Won't Power On

  1. Check the 3-amp fuse behind the monitor console
  2. Test the power supply module (if equipped) — should output steady voltage
  3. Verify 12V at the tractor side of the harness with a multimeter
  4. Inspect the harness connector for corroded or bent pins
  5. Check the console-to-convenience outlet connection is tight — JD troubleshooting guide lists intermittent operation as the first symptom of low voltage

No Population Display (All Rows Show Zero)

  1. Check that the radar unit is connected and spinning freely
  2. Verify row count and row spacing settings match your planter
  3. Clean seed tube sensors — dust and treatment residue block the optical path
  4. If only some rows show zero, check individual sensor cables for damage
  5. Sheared drill shaft pin can cause half the planter's rows to fail simultaneously

Erratic Population Readings

  1. Clean seed tube sensors with a soft, dry cloth or bottle brush
  2. Check for cracked or damaged seed tubes
  3. Verify the distance calibration — an incorrect calibration throws off population math
  4. Inspect the harness for intermittent connections (especially at pivot points)
  5. Check planter drive wheel slippage — excessive down pressure on row units can cause the drive to slip, producing erratic readings. See the JD troubleshooting table for the full diagnostic chart

Speed Reads Zero or Wrong

  1. Check the radar mounting bracket — vibration can loosen it
  2. Inspect the radar cable for cuts or pinching
  3. Verify the radar signal adapter harness is the correct one for your tractor series — see 30-60 Series and 8000 Series radar installation guides for connector locations and routing
  4. If using a GPS speed input instead of radar, verify the adapter cable

HI-WARN or LOW-WARN Alarm Sounds Too Frequently

  1. Population limits may be set too close for current planting conditions — widen the range
  2. Seed sensors may be dirty — clean with a sensor brush
  3. Planter drive wheels may be slipping excessively — check down pressure and ballast
  4. F-AVG mode enabled for low population crops — switch out of F-AVG mode

Which Monitors Are Interchangeable?

The 100 and 150 are functionally identical — both lamp-based with tunable alarm. The 200 and 250 share the same harness connectors but the 250 has more features. The 350 and 450 are the same unit with different model designations.

You can upgrade from a 150 to a 250 or from a 200 to a 350 without changing the planter harness — the connectors are compatible. You may need to add a radar unit if your planter didn't originally come with one (required for speed and area functions on the 250+).

You cannot swap a lamp-based monitor (100/150) for a digital one (200/250/350) without ensuring the seed tube sensors are the correct type. Early lamp-only systems used simpler sensors; the digital monitors need the optical sensor boards that came with later planters.

For wiring diagrams and board-level repair, the technical service manuals are:

These are not free on OMView but contain full wiring diagrams, component-level troubleshooting, and board schematics.

FAQ

What planters work with the ComputerTrak 350?

The 350 is designed for John Deere 1700, 1770, 1780, and 7200 series planters. It supports up to 24 rows.

Where can I find a ComputerTrak 200 manual?

The ComputerTrak 200 is covered in OMA49879, which covers the 100, 200, and 300 together. The OMView link for OMA49879 returns a 404, but the full manual is available free on ManualsLib (76 pages, readable online).

Is the ComputerTrak 250 the same as the 350?

No. The 250 has a digital display but lacks the Population Adjust (PA) feature and the MIN-AVG-MAX population scan found on the 350. The 350 also has more advanced monitor history features.

Can I use a ComputerTrak monitor on a non-John Deere planter?

The monitor itself can read any optical seed sensor, but the harness and calibration are set up for JD row units. Adapting it to another brand would require custom harness work and recalibration.

What's the difference between ComputerTrak and SeedStar?

ComputerTrak is the earlier generation (1980s–2000s). SeedStar replaced it starting in the early 2000s with color displays, GPS integration, and variable-rate control. If your planter originally came with ComputerTrak, you can upgrade to SeedStar but you'll need new harnesses and sensors.

Do I need a radar unit for the ComputerTrak 100?

No. The 100 and 150 use lamp-based alarms that don't require ground speed input. The 200, 250, 300, 350, and 450 all need a radar unit for speed, area, and population calculations.

Is the DICKEY-john DjPM 1000 the same as a ComputerTrak 100?

No. The DjPM 1000 is functionally similar (lamp-based, basic alarm) but built by DICKEY-john with its own connectors, harnesses, and sensors. They are not interchangeable without adapter harnesses. If your planter came with a DjPM monitor from the factory, you need DjPM replacement parts — not ComputerTrak parts.

Browse Our ComputerTrak Inventory

We carry tested, ready-to-ship ComputerTrak monitors and power supplies:

See all our agricultural parts inventory for more John Deere components.