Horsepower

[HarleyRiders97]

Is there an noticeable difference in 29 hp. vs. 35 hp. at the pto on a utility tractor?

 

[bp fick]

Depends completely on the equipment you are going to run with it. Short answer.

 

[HarleyRiders97]

Would like to operate a 5' brush hog and 6' finish mower.

 

[trook]

With a 5ft rotary cutter or a 6ft finish mower, I doubt you will notice much difference unless you are in extremely tall, think grass.

 

[HarleyRiders97]

Looking at TYM 35 hp tractor and McCormick 41 hp tractor, both 4x4, both with loader and backhoe. Cost difference is about $3000 for 41 vs. 35 hp. Have about 4 acres to brush hog and 4 acres to mow, plus snowplowing in winter.....not sure which one to but...

 

[Diamondpilot]

Is there an noticeable difference in 29 hp. vs. 35 hp. at the pto on a utility tractor?

I run a 5' Ford Bush Hog and a 6' Caroni Finish Mower with my Jinma 284. Its a 28 Hp 4x4 diesel tractor. I had it dynoed and it did a peak 31 Hp on the pto but simple short answer is you will have no problem. My good friend has a Case DX29 and runs a 5' King Kutter Bush Hog and a 6' Land Pride Finish Mower and has no issues either. Rule of thumb is 5 HP per foot on mowers and Bush Hogs for most instances.

Chris

 

[bp fick]

$3000 would buy a lot of neat implements. But which tractor suites your seat, arms, feet and eye? If you know what I mean.

 

[jcmseven]

The more important figure here might be the torque of each machine and whether it is at the same rated speed. I know some of the newer JD compacts have disparate HP ratings, both flywheel and PTO, but the torque numbers are close. I know we go by PTO HP all the time, but this might be but one facet of the question at hand. I agree with Chris and the others, you would be fine with either, but one might labor a bit more than the other in the work at hand.

John M

 

[Soundguy]

Is there an noticeable difference in 29 hp. vs. 35 hp. at the pto on a utility tractor?

about 1' of mower difference... etc..

soundguy

 

[Ken45101]

I don't know either of the tractors, but you might pay attention to what rpm you need to get 540 on the pto.

The Kubota KX series has to run flat out at max rpm (2700) to run the pto at 540. The Kubota M series loafs along at 2000 rpm, about 20% below max. Personally, I don't like have to run any engine at constant max rpm, it just doesn't seem good.

Also check what the noise level when running the 540 pto speed.

Ken

 

[art]

I don't know either of the tractors, but you might pay attention to what rpm you need to get 540 on the pto.

The Kubota KX series has to run flat out at max rpm (2700) to run the pto at 540. The Kubota M series loafs along at 2000 rpm, about 20% below max. Personally, I don't like have to run any engine at constant max rpm, it just doesn't seem good.

Also check what the noise level when running the 540 pto speed.

Ken

I would listen to both tractors at PTO speed! We have several near new used tractors in our yard and they are so loud I was shocked that they were even built in this century. Even a plastic hood couldn't begin to hide the noise of one of them.

Some engines are designed and built right and can run all day at high rpms and some sound like they are near their last revolution.

 

[Soundguy]

Personally, I don't like have to run any engine at constant max rpm, it just doesn't seem good.

Ken

I guess all them engineers were probably just plumb dumb then.. doing al that math and stuff ...??


If an engine is ratred to run at 'x' rpm for a specific purpose.. then you aren't hurting it to do so.

IE.. if running pto rpm caused damage tot he engine.. they wouldn't have used that gear ratio.. etc. have a lil faith in the manufacturer.. they spend decent money making any particular model tractor fromt he design stage.

soundguy

 

[Soundguy]

I would listen to both tractors at PTO speed! We have several near new used tractors in our yard and they are so loud I was shocked that they were even built in this century. Even a plastic hood couldn't begin to hide the noise of one of them.

Some engines are designed and built right and can run all day at high rpms and some sound like they are near their last revolution.

IMHO.. some noise has to do with #'s of cyls.

2cyl machines tend to hammer like they are throwing a rod.. 3 can as well, compaired to 4 cyls.. etc.

soundguy

 

[Gary Fowler]

If you really want to get scientific, look at the HP curve for your proposed tractor and see if the 540 RPM speed is at the max power curve. That way you would have the most power available at the rated PTO speed for most implements. I am constantly amazed at the depth of research and comparison that some of the posters here go to to decide on a tractor. Personally I am more of a how is the dealer, does the operators platform fit my body, is the seat adjustable and support my back, are the ergonomics good for me which is high on the list along with does it have a decent warranty and most of all $$$$$. If it tops out on all those points, I'm not going to split hairs over the fuel consumption is it .9 GPH or 1.1 GPH. I suppose the sound of the engine would also be a consideration if one was hammering like Thor on a rampage, I would pass on that in favor of a smoother running diesel. Most of all, will it do all the things that I need it to do? For the original poster, do you really need a 35-40 HP tractor to mow 4 acres. A twenty HP with a 4 foot mower would do that chore in a couple of hours.

 

[Raw Dodge]

Here in the northeast,one of the biggest factors is how well can it cold start.......its a huge issue here,although diesels are much better than they used to be.My tractor sits in a barn in the winter with no running water and no electric,so it needs to fire on its own even down to -20 degrees,which it does every time.Not bad for a 24 yr old ford 1910.Some tractors will not....

Personally id go with the 35hp pto,because i have 28.5 and often wish for a few more..but im taking care of a lot more property .For what your doing,either will be fine running the impliments you have.
As for the PTO rpm,while it is important,it isnt the end all.Most small tractors run 2500-2800rpm pto speeds...The piston speed is more important than the RPM,IMO. IMO with diesel tractors, it is always better to rev it too high than not high enough,the only thing you stand to lose is a little extra fuel,an engine thats lugged and labored constantly will wear out much faster,as the load is higher,and the pistons thrust side and bearings take a a pounding.A larger engine may spin only 2000RPM,but have a higher piston speed than one running at 2500,due to a very long stroke.These long stroke engines make great torque down low,but they are usually heavy,expensive and rpm limited.There found in larger tractors usually.Shorter stroke small diesels spin faster and run more like a gasoline. engine .I am a fan of the long stroke low rpm diesels in most aplications.....

 

[Egon]

Originally Posted by art
I would listen to both tractors at PTO speed! We have several near new used tractors in our yard and they are so loud I was shocked that they were even built in this century. Even a plastic hood couldn't begin to hide the noise of one of them.

Some engines are designed and built right and can run all day at high rpms and some sound like they are near their last revolution.
IMHO.. some noise has to do with #'s of cyls.

2cyl machines tend to hammer like they are throwing a rod.. 3 can as well, compaired to 4 cyls.. etc.

soundguy

It may also depend on the cylinder alignment, harmonics of the inlet/exhaust manifolds and the type of muffler. There is also the turbo noise to consider

 

[art]

IMHO.. some noise has to do with #'s of cyls.

2cyl machines tend to hammer like they are throwing a rod.. 3 can as well, compaired to 4 cyls.. etc.

soundguy

It has nothing to do with number of cylinders but the smoothness of the engine. Some sound like they are fighting inside and some are just nice and smooth!

 

[HayDR]

Is there an noticeable difference in 29 hp. vs. 35 hp. at the pto on a utility tractor?

Just think about it. If you had 20% more power in anything would it make a difference?

 

[Egon]

but the smoothness of the engine

Some information for those interested.

 

[Soundguy]

It has nothing to do with number of cylinders but the smoothness of the engine. Some sound like they are fighting inside and some are just nice and smooth!

It's fairly universal that as you add cyls.. the engine sounds smoother. there are plenty of other variables.. but IMHO.. I'd rather work behind a 4 cyl.. than a 3, a pop-pop or a onelung bang--chug.

soundguy