Description
In this video I respond to a viewer letter from Sabine, a tractor owner who asked two smart questions before buying a rotary cutter. Her letter opened the door to three topics every tractor owner — especially newer ones — needs to understand before hitching up a cutter and heading into a hilly field. The one on PTO shaft angles is especially important.
Sabine has a three-acre property with steep hills and a narrow section with a dip between a downhill and uphill run. She's currently running a John Deere Auto Connect 54-inch belly mower but wants to cut higher for pasture health. She's considering a 48-inch rotary cutter and wants to know if the dips will put her PTO shaft at risk, and how her tractor will handle steep hills with a rear-mounted cutter versus the belly mower. Those are exactly the right questions to ask before you buy.
⚠️ The PTO Shaft Danger New Tractor Owners Don't See Coming
Every year, people new to tractors cause serious damage cutting through fields with dips or valleys — and they never saw it coming. Here's what happens: as your tractor climbs out of a dip, your cutter is still angled downward. The PTO shaft on the tractor points one way, the shaft on the cutter points the other, and universal joints simply can't handle those extreme angles. Something has to give — either a bent PTO shaft, a snapped stub shaft off the back of the tractor, or a blown gearbox on the cutter. None of those are cheap fixes. I pull out a page from Bush Hog's owner's manual on this, share footage from my own property, and walk through why some dips are just too abrupt to navigate safely with a rear-mounted cutter.
🚜 Rotary Cutter vs. Finish Mower vs. Belly Mower — Know the Difference
These three cutters are not interchangeable. A belly mower delivers a clean lawn-style cut and provides excellent weight distribution for traction on hills. A finish mower mounts on the three-point hitch and cuts beautifully, but its weight rides on the ground rather than the tractor, so it offers less traction assist on steep slopes. A rotary cutter is built for rough work — thick blades, slower speeds, designed to handle grass and woody brush. The tradeoff is cut quality. If you're expecting a clean, manicured result from a rotary cutter, you're likely going to be disappointed. I saw this constantly in my dealership days, and Sabine's situation is a perfect example of why matching the right cutter to the job matters.
✂️ Cutting Height — There's a Sweet Spot
Cool-season grasses are healthier when cut at four inches or higher — you get denser turf, fewer weeds, and less stress on the grass. But push much above four inches and your cut quality drops. Mower decks create turbulence that stands grass up before the blade cuts it. Get the grass too tall and that turbulence blows it down instead, leaving an uneven, patchy result. I tested this on my own property and saw it firsthand with a commercial customer running a wide Bush Hog at six to eight inches — we could never get it to look right. Four inches is the sweet spot.
🎯 My Recommendation for Sabine
Keep the belly mower — they're hard to sell used anyway — and use it for dips and tight sections where PTO shaft angles are a real risk. Add a finish mower on the three-point for the open pasture and hills. Cut at four inches and you'll have healthy grass and a cut you're proud of. Six inches sounds good in theory but the results won't be what you're hoping for.
If you've had success cutting at five or six inches and found a way to make it look clean, tell me about it in the comments!
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