HP to Finish Mower Size: Field Mowers Brush Cutters  -- Tractor Attachments Implements 3ph Discussion Forum and Review HP to Finish Mower Size: Field Mowers Brush Cutters -- Tractor Attachments Implements 3ph Discussion Forum

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 06-02-2005, 22:50 Post: 111887
sumfir



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 HP to Finish Mower Size


Buying my first tractor with a 72" finish mower. Since i am new and ignorant to anything bigger than a riding mower, I wanted to seek additional input. Set to take delivery on a Kioti CK30 gear tractor (25 PTO HP), however the dealer believes that I can mow 5 flat acres just fine with the CK25 (20 PTO HP). He showed me the spec sheet on the Kioti mower and for a 72" mower it states that 20HP is with in the range. Money is tight for me, so I am intersted in a smaller unit if it will work. (just in case your thinking the dealer wants to move the smaller tractor, he has more of the CK30 in stock so I dont think that is it)

Now not knowing anything tractor and mowing with anything that had a gear case i would say no way with a lawn tractor. Damp grass slows and bogs mowing. Speed is another factor. I dont want to crawl around the yard. That is why I think the bigger tractor would be better.

Suggestions Please!






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 06-03-2005, 07:01 Post: 111894
greg_g



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 HP to Finish Mower Size

I had a 24hp Yanmar that had enough power for me to use the 60" finish mower as a light duty bush hog; (up to) 12" grass/weeds, 1" saplings, etc. It could have easily handled a 72". My 25hp Jinmas spun a 60" bushhog, easily tackling young trees up to 2". It too could easily have handled a 72" finish mower.

Both had ~20 PTO hp. I'd say your Kioti dealer knows what he's talking about

//greg//






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 06-03-2005, 07:55 Post: 111895
Murf



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 HP to Finish Mower Size

Generally speaking, you need about 5hp per foot of mower.

That however is so that you are not running at the very edge of it's capabilities and that you can handle a range of conditions, hills, heavy grass, etc.

If you are cutting flat land with a finish mower only, i.e. no bush-hogging 3' high stuff, then I would think you will be OK with a 72" mower on a 20hp machine.

IMHO however, I think you will be happier with a slightly larger, good used machine instead.

Tractors are like boats, no matter how big a unit you buy, you're soon thinking you should have gotten one just a little bigger.

Best of luck.






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 06-03-2005, 12:27 Post: 111908
sumfir



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Thanks Murf!

I knew there had to be a simple rule of thumb out there. Now is that Tractor or PTO HP. If it is tractor HP then I was right to think bigger. If that is PTO HP then the CK 30 is a little light.

Thanks






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 06-03-2005, 12:36 Post: 111910
greg_g



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I'm pretty sure Murf's rule of thumb relates more to rotary cutters than to finish mowers. Any tractor can efficiently handle a larger finish mower than it can a rotary cutter, by at least a foot.
Don't try to over-analyze this. By Murf's rule, 25 tractor hp can handle a 5 foot rotary cutter. By consensus (and through experience) it can also handle a 72" finish mower.

//greg//






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 06-03-2005, 12:41 Post: 111911
Murf



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Any time you are talking about implement requirements the figures stated are always PTO hp available to drive it. Some manufacturers though will tell you the size of TRACTOR required for a given piece, in that case they are talking engine hp.

Bear in mind also, manufacturers published hp figures are notoriously, err, umm, well, rather 'optimistic', to put it politely. In fact they are often, if you check the fine print, hypothetical figures calculated by their engineers. Even if they are genuinely measured, they still are often exclusive of things like hydraulic or power steering pumps, and done on a test bench, NOT in the real world.

If a tractor is rated at 20hp at the PTO, that is with the engine producing the full 25hp it is rated for. If you are, for example, going up a steep hill, you might be getting significantly less at the PTO than the rated power.

Best of luck.






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 06-03-2005, 12:53 Post: 111912
DennisCTB

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I think you might be missing the bigger issue with your purchase, that being with a gear machine you do not have a "live PTO", in my opinion this is a must for finish mowing applications.






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 06-03-2005, 13:13 Post: 111913
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HUH?

//greg//






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 06-03-2005, 13:38 Post: 111914
bmlekki



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 HP to Finish Mower Size

As Dennis was saying, you'll want a two stage clutch. A two stage clutch will clutch the drive gears, half way depressed, and fully depressed will the clutch the PTO. This is very helpful then mowing / snow blowing. The 2 Stages will keep you from having to stop the implement, when shifting from forward to reverse. Saves a lot of time.
I think if you get a 4x4 gear they come with the two stage. {I know this is true with the deeres.}
Good Luck!






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 06-03-2005, 14:01 Post: 111915
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Oh. I get it. The CK25 has a 2 stage clutch/live PTO, whereas the CK20 does not. Is that your point? If so, I agree wholeheartedly. Get the CK25

//greg//






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