What Happens When You Put a HUGE mower on a Small 25hp Tractor?

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I have an RK24 and have used my dad's 84 inch bushhog finish mower many times with no issues. A finish mower doesn't require as much hp as a brush cutter. Now I wouldn't buy a 7 ft mower for it if I were buying one but wouldn't hesitate to buy a 6 ft finish mower for it

Preciate the breakdown of factors that influence the performance of tractor

Well I'm not a tractor guy, do know a lot of what you are talking about, but it sounds like you are extremely knowledgeable! You are a great communicator of information and strategies. Great progress on Piney Grove! Love your videos and content.... Keep them coming!

Good video to let people know what to expect with their 25hp machine.

They used 6 foot finish mowers on 26-29 horsepower tractors in the 50s with little problem. Depends on how well/efficient the finish mower is designed. Likely a rear discharge mower is better than a side discharge in terms of horsepower requirements. For the GM3072 it lists 25hp as the absolute minimum. You can find 6' finish mowers with as little as 16HP minimums. I would also suggest comparing the same blade style/design characteristics. If one has high lift blades and the other has low(ish) lift blades, that can make a big difference. Also if the blades are "U" shaped, it can reduce horsepower requirements (____--------------------____). I guess it also depends on how inefficient the 25HP tractor is designed (e.g. power steering, hydrostatic, electric clutches...).

Our 1025r runs a 6’ brush hog no problem as long as you keep the speed 5mph or under. Not ideal but we’ve gotten by for 5 years with the setup.

There can be built a massive 25 horsepower diesel engine as well. Imagine a cylinder the size of a garbage can. "Low horsepower huge torque."

Thanks for the knowledge !

Great video. You can run a 72" off a 25hp, but so much depends on what you are trying to do. If you are mowing a baseball ground in dry conditions it'll be fine, but add in long, wet grass, bumps, hills it's completely the wrong machine for the job. The mower makes a huge difference as well. Dull blades, dirty deck, ungreased just saps away those HP. Soft start PTO's also help out a lot. If you are thinking of doing it make sure you trial the tractor / mower combo on where you are going to use it first!

I put out a video 2yrs ago with a John Deere 1025r running a GM1072 rear finish mower. I have run it for 2yrs with no problems whatsoever so ever. Now I have a 2025r and it handles it even better. The difference between the 2 tractors with how they handle that mower is weight and height . The 1025r didn’t have filled tires so changing direction from forward to reverse was a problem until the mower wheels reorientated. My 2025r has more weight stock and it has bigger rear tires that are filled which gives me more weight advantage over the mower. I mow several acres with each mowing trip.

My grandfather farmed 80 acres with a 20hp Oliver 60, he did use a 6’ mower but the tractor had a manual transmission which as you said saves you HP on the PTO.

have 04 kubota b7610 have been using 72" finish mower on it since new in 04 no problems

nice demo ty

Thanks for the demo. I have 3 acres and a Kubota 2601 compact. It works great for my size farm. Makes sense to get proper attachment for size tractor. I am looking at different attachments so can look at correct size; especially if looking at used equipment.

I use a 3025e with a 60inch sovema finish mower, it rarely bogs down in tall grass/weeds, if I’m at 540 rpm it might go to 510ish in the really tall stuff. Not an issue at all, I have 14 acres up here in 🇨🇦

I run a 1965 Massey Ferguson 180 , 55 horse , 4 cyl. Perkins Diesel, a beast ,

I put diesel in a blue kerosene can and I run a 5 foot brush cutter on a 25hp. Does great for normal mowing but not for thick wet grass or heavy brush.

a lot of the issue comes with the hydrostat transmission in the newer sub compacts. sure the hp of the crank is 25hp, but like you said, there's only 18 hp at the pto. with an older gear driven tractor, 25 hp is 25hp at the pto. So my point is that you can absolutely put a 6foot mower on a 25hp gear driven tractor.

I have a 2011 Bobcat CT445 45hp , I’ve been mowing waterways since new with a Woods RM990 , 90” 71/2 foot finish mower. It has swinging blades so it cuts 2” trees brush also . The mower was used when I got it no for sure it’s age.