Third-cut alfalfa comes off the field dry, long-stemmed, and surprisingly difficult to process. In a good year that’s a minor inconvenience. Right now, with Alberta operations running back-to-back batches and corn silage only weeks away, a mixer that won’t chew through a bale load inside a sensible window creates real problems at the bunk.
The symptom is familiar: hay goes in, the auger strains, and the load spins longer than it should. Feed time slips. The ration that finally comes out looks acceptable, but you’ve burned extra fuel and pushed your window tight. What’s actually happening inside the tub is more specific than most operators realise.
Why Third-Cut Stems Climb Instead of Cut
Third-cut alfalfa is typically drier and stemmy compared to earlier cuts. When those stems enter a vertical mixer, they need to reach the high-pressure zone near the bottom of the auger where knives do most of their work. If they don’t get there fast enough, they ride up the auger, stay near the top where pressure is lowest, and essentially just circulate. The auger keeps turning. Nothing much happens.
Two things push material down into the cutting zone: tub pressure from the walls bearing inward against the load, and the kicker pulling feed off the wall and back onto the auger. When either of those is compromised, long dry stems find the path of least resistance and float. Batch time climbs.
The knife edge matters here more than the number of knives. A blade that has lost its edge doesn’t fail completely; it just stops folding stem material cleanly over the cutting edge. The auger deflects the stem instead of shearing it, and you get partial cuts and longer cycle times instead of a clean, fast break-down. Replacing only the worn outer edge rather than the whole blade keeps cost low and keeps that cutting geometry intact through the season.
What the Load Cell Is Actually Telling You
Operators often describe a problem batch as one where the finished mix looks fluffy or unconsolidated. That’s a downstream symptom. The real signal appears earlier, on the scale ticket.
Watch the weight trace during hay addition. In a well-set machine processing third-cut alfalfa, you’ll see a steady weight increase as the bale breaks down and settles into the load. When stems are climbing instead of cutting, the weight drop slows or stalls mid-addition. The bale is intact longer than it should be. The auger is churning around it rather than through it.
That pattern, slow weight settlement during hay addition rather than a fluffy end product, tells you where to look. It’s a fill-level, knife, or kicker problem rather than a mix-time problem. Adding minutes to the cycle doesn’t address any of those, as covered in more detail in the article on why extended mix time doesn’t fix a bad load.
A Short Checklist Before Corn Silage Arrives
You don’t need a different tub. You need the current one set correctly for this material. Work through these four points in order.
Fill Level
A common mistake with dry, light-density hay is over-filling. When the tub is too full, bales can’t drop into the pressure zone near the bottom. They sit high, spin slowly, and take far longer to break apart. With third-cut alfalfa specifically, run at a conservative fill level. Give the material room to fall.
If you’re uncertain where the line is for your machine, auger geometry plays a significant role in how fast material reaches the cutting zone, and matching fill level to auger design is part of that picture.
Knife Edges
Run your thumb along the edge of each knife. A sharp edge catches your skin noticeably. A worn one doesn’t. For alfalfa and round bales, the knife layout matters too: small knives on top allow stem material to fold over the relief cuts in the auger flight and shear cleanly. Large knives in the top position can cause material to deflect and spill rather than cut. Check both edge condition and position.
Kicker Condition and Size
The kicker sits at the outer lower edge of the auger and its job is to pull feed off the wall and back into the auger’s path. A worn or missing kicker creates dead spots along the tub wall where material packs and stagnates instead of circulating. For high-hay rations like a third-cut alfalfa load, a larger kicker is appropriate. Light, airy material needs more aggressive encouragement back into the flow than a wet silage-heavy ration does.
Check for physical wear first. A kicker that has lost its profile through use is often the single cheapest fix available when mix quality starts deteriorating during the first loads of the day. If the kicker looks intact but you’re still seeing wall stagnation, consider sizing up for this ration type.
Loading Order
Load dry hay last where possible, not first. Starting with heavier, wetter ingredients, silage or concentrates, builds a base that creates resistance for the auger to work against. Hay added into an already-moving, partially weighted load breaks down faster than hay dropped into an empty tub. The physics aren’t complicated: the auger needs something to push against.
Setting the Machine Up Before Silage Season Hits
Third-cut alfalfa isn’t just a feeding challenge. It’s a useful diagnostic window. Dry, stemmy material exposes exactly the weaknesses that will cost you later when corn silage arrives and you’re running two or three loads a day under real time pressure. A kicker that barely keeps up with dry hay will fall apart under the demands of high-density silage batches.
LEO Agriculture’s bolt-on kicker system covers four sizes, from Small through Extreme, specifically so operators can match aggressiveness to ration type and swap configurations as the season changes. Their modular V2 knife system uses tungsten-carbide coated replaceable edges, so you’re changing only the worn outer section rather than the whole blade. Both of those details matter when you’re servicing a machine mid-season and don’t want to be waiting on parts.
Get the knife edges sharp, confirm the kicker is the right size and not worn out, and watch your fill level on light dry loads. Those three adjustments, done before the corn silage front arrives, are the difference between a machine that keeps pace with your feeding window and one that’s costing you time every batch.
