Planter Metering Systems

The meter decides whether each seed lands where you want it. Knowing the types and what upsets them helps you plant better stands.

Key points

Meter types include plate, finger pickup and air or vacuum.
Match plates and disks to your seed and recheck for each lot.
Skips and doubles point to specific causes; work through them in order.
Clean, dry storage extends meter life.

What does a planter meter do?

A planter meter picks seed from the hopper and releases it at a controlled pace. The goal is steady, even spacing along the row. Everything after the meter, such as the seed tube and the furrow, can help or hurt that spacing, but a poor meter makes every other fix harder.

Meters are driven by a chain, a ground wheel or an electric motor, depending on the planter. The drive ties the seed rate to ground speed, so spacing stays steady when you speed up or slow down within the planter's working range.

For a farmer with a 5-acre garden plot and a small planter, the same ideas hold. Seed spacing is the point of the meter whether you plant ten rows or a hundred.

What are the main types of planter meters?

Plate or disk meters use a rotating plate with cells or holes sized for the seed. Finger pickup meters use spring-loaded fingers that grip seed. Air or vacuum meters use air pressure difference to hold seed to a disk and release it at the right moment. Some units use brush or belt systems for delivery.

Each type has strengths. Plates are simple and easy to learn. Air systems can handle a wider range of seed and speed but need a fan or pump and sealed housings.

Plate or disk: simple, replaceable plates
Finger pickup: mechanical, seed size sensitive
Air or vacuum: wider seed range, more parts
Check your manual for the type on your unit

How do you match plates or disks to your seed?

Seed size and shape vary between crops, hybrids and varieties. Use the plate or disk the manual and seed company recommend for your seed, and check the stamping on the plate to make sure it is the right one. Never force a plate that does not fit.

Rounded, graded seed meters best. Flat or irregular seed may need a different plate or a different setup. If you switch seed lots, test the meter again before planting a whole field.

Keep a note of which plate went with which seed lot, and mark the box so you do not have to guess next spring.

What causes skips and doubles?

Skips come from worn or dirty meters, empty hoppers, bridging seed, damaged tubes, low vacuum or loose drive chains. Doubles can come from the wrong plate, worn seed pickup parts, too much agitation, or running above the planter's speed range.

Do not guess. Park the planter safely, read your manual's troubleshooting guide and look at each possibility in order.

Check ground speed against the manual's range before you start. Many spacing complaints come from simply driving faster than the planter was built to run.

Skips: dirt, wear, bridging, low vacuum
Doubles: wrong plate, worn pickup, high speed
Uneven rows: drive chain or ground wheel slip

How do you check vacuum or air systems?

On air or vacuum planters, hoses, seals and fans must be intact. Listen for leaks, look for cracked hoses and check seals on the meter housing. A gauge shows pressure on many units. Compare it with the range in your manual.

Do not stand near a running fan or driveline. Shut down and let everything stop before working. Hydraulic fan drives involve pressurized oil, so leave work on those circuits to a qualified mechanic, and never check a hydraulic leak with your hand.

How do you care for meters between seasons?

Empty all seed, brush meters clean and store them dry. Follow the manual on lubricants and graphite use, since the wrong product can attract dust or damage seals. Replace worn brushes, seals and gaskets before the next season.

Store plates and disks flat and labeled. Take a photo of your settings before you disassemble anything. Those small habits keep planting day moving.

How do you test a meter, and what should you ask a dealer?

Many planters allow a bench test or a quick drive-wheel spin with seed in the hopper. Turn the wheel by hand and watch each meter release seed. Look for even drops and for any unit that behaves differently from the rest.

Then confirm in the field. Plant a short pass, uncover seed and compare the spacing to your target. A small test costs a few minutes, while a bad meter found after planting costs a stand.

When shopping new or used, ask which meter type the planter uses, which plates or disks are available for your crops, what the wear parts are and how long parts take to arrive. Ask whether a meter can be bench tested and who can do it. Ask what the planter needs from the tractor, such as hydraulic flow for a fan drive or electrical connections for a monitor. The market for electronic systems changes fast, so ask what is supported locally.

Spin and watch each meter
Compare units to each other
Plant a test strip
Dig and measure

When to get help: For hydraulic fan drives, electronic drive faults or rate controller errors, call the dealer service department. Follow the manual on specified lubricants and parts.

Sources and further reading

Organization homepages are linked so you can search them for current guidance on this topic.

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