The Ultimate Pre-Planting Planter Checklist: Getting Your Seed Drill Ready for the Season

Precision Is Profit, and It Starts in the Shop

When the soil temperature hits the optimal window and the weather finally breaks, you need your equipment to perform flawlessly. Your planter or seed drill is arguably the most financially critical implement on your farm. A poorly calibrated or maintained planter will result in uneven emergence, skipped rows, and double-seeds—all of which directly translate to lower yields and lower profits at harvest time.

Waiting until you pull the drill out of the barn on planting day is a recipe for disaster. At Iron Machinery, we advocate a proactive, comprehensive inspection of your planting equipment at least 30 days before the season begins. Here is the ultimate technical checklist to ensure perfect seed placement.

1. Evaluate the Ground Engaging Components

The pieces touching the dirt take the most abuse. A worn disc blade cannot create the “true V” trench required for optimal seed-to-soil contact.

Disc Openers: Measure your double-disc openers. A typical new disc is 15 inches in diameter. If it is worn down to 14.5 inches or less (depending on manufacturer specs), it must be replaced. Check the contact point (where the two discs touch at the bottom). There should be about 1.5 to 2 inches of firm contact. If they are loose or not touching, shim them or replace the bearings.
Seed Tubes and Guards: Inspect the bottom of your seed tubes. Over time, worn disc openers will allow the soil to grind away the plastic tips of the seed tubes, causing seeds to bounce out of the trench rather than dropping cleanly into the V. Also check for internal burrs or debris that could impede seed flow.
Gauge Wheels: Make sure the rubber gauge wheels are tightly against the disc openers. If there is a gap, dry soil and residue will fall into the trench before the seed drops, leading to dry dirt acting as a barrier to moisture. Adjust the shims on the gauge wheel arms to eliminate the gap.

2. Calibrate the Seed Meters

Your seed meters are the brain of the operation. Whether you use mechanical finger pickups, vacuum, or positive air meters, they require rigorous testing.

Vacuum Systems: Check every single seal and hose. A small crack in a vacuum line will cause uneven vacuum pressure across the toolbar, resulting in dropped seeds (skips) on the rows farthest from the fan. Inspect the seed discs for wear or warping.
Finger Pickups: Open the housing and inspect the finger tension, the backing plate, and the seed brush. If the brush is stiff or worn down, it will allow “doubles” (two seeds dropping at once). Run your meters on a calibration stand to verify 98%+ accuracy before they ever touch the field.

3. Closing Systems and Downforce

Getting the seed into the ground is only half the battle; closing the trench properly is what seals the deal for germination.

Closing Wheels: Check the tension springs. The goal is to eliminate air pockets around the seed without compacting the soil so hard that the seedling struggles to emerge. Make sure the closing wheels are centered perfectly over the seed trench.
Downforce (Pneumatic or Hydraulic): If you use an active downforce system, inspect the air bags for dry rot and leaks, or check the hydraulic cylinders for weeping seals. Proper downforce ensures consistent planting depth across varying soil types and compactions.

4. Electronic Sensors and Wiring

Boot up the tractor monitor and unfold the planter in the yard. Spin the gauge wheels manually if possible to test the seed tube sensors. Rodent damage to wiring harnesses over the winter is incredibly common. Check every connection point for corrosion.

By investing a weekend in the shop executing this checklist, you are fundamentally protecting your yield potential. Every seed placed accurately is money in the bank. Do not leave your harvest to chance.