Is Your Planter Putting Every Seed at the Same Depth? The 10-Minute Gauge Wheel Check
Your gauge wheels set seed depth. When they wear, drift out of adjustment or pack with mud, depth changes from seed to seed, and the plants that come up late yield less. You can check a row in about 10 minutes, and this fall or winter in the shop is the time to do it.
Every row. Every seed. Same depth. That is the gauge wheel's whole job.
What gauge wheels do on a row unit
Two 16-inch gauge wheels ride on each side of the double-disc opener. The depth handle sets how far the discs cut below the wheels. The discs can only go as deep as the wheels allow.
The wheels also carry the row unit's downforce into the ground, and the inner lip of each wheel presses the trench wall back down so loose, dry soil stays out of the seed zone.
If a wheel is worn small, packed with mud or bouncing, the seed in that row goes in at a different depth than the row next to it.
Why a little depth difference costs bushels
Corn wants every plant up at the same time. A plant that comes up late is shaded and crowded by the plants around it, and it never catches up.
Precision Planting's multi-year emergence study found corn plants that came up 12 hours late averaged an 11% yield loss. At 36 hours late it was 28%. At 48 hours, 59%.
Illinois Extension measured a 6 to 9% yield cut from a week and a half of emergence delay.
Gauge wheels aren't the only cause of uneven emergence. They do control two of the biggest ones: seed depth and moisture at the seed.
Why a planter that was right last spring may be off now
Disc blades wear smaller and thinner every season. Gauge wheel lips wear down. Both open a gap between the wheel and the blade. Almost nobody checks this every year, and most planters have a few rows that are out.
The 10-minute row check
Check the discs. Slide one business card in from the top and one from the bottom between the blades until they stop. The gap between the cards should be ½ to 1½ inches. Replace blades worn to 14½ inches or less.
Lift and spin. Raise the gauge wheel to mid-travel and spin it. It should turn freely but brush the blade. Run your finger along the seam between wheel and blade and feel for a gap.
Drop and spin. Lower the wheel and spin the blade. The blade should pull the wheel slightly forward. That tells you they're in contact.
Shim to fix. Move washers from the inside to the outside of the gauge wheel arm to bring the wheel in. If you're out of shims, the wheel is done.
Rock it. Grab the wheel top and bottom and rock it. Any wobble means a worn bearing or arm bushing.
Look at the inner lip. A chipped, rounded or cut lip can't firm the trench wall.
The target is light contact: no gap and no drag. Kinze's maintenance guide says the same thing. Check one row and you'll know whether to check them all.
Signs your gauge wheels are done
What you see | What it does in the trench |
Gap between wheel and blade | Dry soil and residue fall in ahead of the seed. Rows come up in waves. |
Chipped, cut or rounded inner lip | Loose, ragged trench wall. Depth varies seed to seed. |
Wobble at the hub | Wheel walks away from the blade and the unit bounces. Depth swings. |
No shims left | You can't close the gap anymore. Time to replace. |
Cracked or chunked tire | Wheel is no longer round, so depth changes every revolution. |
Mud building up inside a solid wheel | The wheel gets bigger and the seed goes shallower in wet spots. |
Why spokes hold depth better in wet ground
A solid wheel packs mud inside the rim. As it builds, the wheel's diameter grows and the seed rides shallower. In a wet spot, that row is planting at a different depth than you set.
ESS-AG gauge wheels have narrow, straight spokes. Mud falls through instead of packing in, so the wheel stays the same size and the seed stays where you set it. They come in 16 x 4.5 inch and 16 x 3 inch and fit most 16-inch gauge wheel planters from John Deere, Kinze, Case IH and White. Call us with your planter model and we'll confirm the fit.
What a full set costs
Gauge wheels work in pairs on every row, and they wear together. If one row is out, the rest are close behind. Replace the planter, not one wheel at a time, so every row runs at the same depth.
Planter | Wheels | ESS-AG set price |
12-row | 24 | $2,400 |
16-row | 32 | $3,200 |
24-row | 48 | $4,800 |
Here's the math on a 16-row. A $3,200 set spread over 1,500 acres of corn is about $2.13 an acre in the first year. At $4 corn, that's about half a bushel an acre to break even, and the wheels run more than one season. Compare that to the 11% loss on a plant that comes up 12 hours late.
Common questions
How often should I check my gauge wheels?
Every season, before planting. Disc blades and wheel lips wear every year, so last year's setting won't hold.
Should the gauge wheel touch the disc blade?
Yes. In planting position you want light contact: no gap and no drag. Too loose lets dry soil into the trench. Too tight wears the tire and lip fast.
Do I need to replace all my gauge wheels at once?
Usually, yes. Wheels on the same planter wear at about the same rate. Putting new wheels on some rows and leaving worn ones on others gives you different depths across one planter.
Should I run 3-inch or 4.5-inch gauge wheels?
The 4.5-inch is the standard. The 3-inch is common in strip-till, ridge-till and many no-till fields. If you're not sure, call and we'll talk through it.
How much do ESS-AG spoke gauge wheels cost?
$100 per wheel. A 16-row set of 32 wheels is $3,200.
Check one row this week
Pull the planter in on a rainy day and do the 10-minute check on one row. If the wheels are done, call or text Brian at 573-239-0812 or Chase at 660-833-6580. Tell us your planter model and row count, and we'll quote the full set or point you to an ESS-AG dealer near you. Order this winter and have the set on your shop floor before spring.
Every Row. Every Seed. Same Depth.
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