Kubota L3240 L3800 transmission types: Kubota Review  -- Kubota Tractors Discussion Forum and Review Kubota L3240 L3800 transmission types: Kubota Review -- Kubota Tractors Discussion Forum

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 09-22-2011, 08:01 Post: 180491
mlucius



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 Kubota L3240 L3800 transmission types

I'm ready to purchase a new Kubota tractor and am trying to decide on the transmission. I have some loader work but mostly bush hogging STEEP hills and also some rototiller work. I like the idea of the hst but am a little leary about it's performance on hills. Some of the slopes are 3:1 or even 2:1 in a few places. Also, any suggestions on hp. I'm not doing production work but don't want to short myself on power. I'm considering the L3240, L3540, L3800 and L4400.






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 09-22-2011, 10:19 Post: 180492
kthompson



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 Kubota L3240 L3800 transmission types

Can not fully answer your question for the truly steep hill for long period of time.

I have a B2710 with HST and do a fair amount of bush hogging with it.(NO loader) My other tractor which has manual transmission and over twice the HP was what had been using and not it is used very seldom. Much of my work is in tight places such around trees, ditches and pond. The HST gives me the ability to run along at decent speed and then drop speed very quickly and reverse the direction smoothly and quickly. Not possible with my manual. If I were doing such as open field or pasture would not be any benefit but for close or tight work to me can not be beat. As to hills just don't have them but don't think pulling power will be an issue. Just put the HST in the right range.






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 09-22-2011, 10:52 Post: 180493
mlucius



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 Kubota L3240 L3800 transmission types

Thanks, that's good to know. Sounds like the hst is probably the right way to go.






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 09-22-2011, 13:03 Post: 180501
AbbasChild



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 Kubota L3240 L3800 transmission types

I would agree with kthompson--I have a NH T-2210 (previously TC33DA) with HST transmission. I find it very safe on hills. As mentioned already, I can change directions and speeds on a slope without worrying about depressing a clutch. I have not had any problems with power--31 hp--either brush cutting on hills or carrying a load with FEL.






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 09-22-2011, 13:08 Post: 180502
bhaxel



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 Kubota L3240 L3800 transmission types

For loader work or anything like grading, the HST can't be beat! Being able to instantly speed up, slow down or change direction makes it really easy. I don't do mowing with mine (B7800), but I would think that any maneuvering around things while mowing would be easier with HST than without.

The HST is designed to give you full power, so the hills shouldn't be a problem.

On mine, I do have to keep my foot on the pedal in order to go, which might be tiring when mowing for a long time. There is a provision to lock the pedal in position, but it only has a few notches, and doesn't go to full speed. Newer/fancier models probably have a better arrangement. I think some have a "cruise control" of some sort. It's something you might want to look into before you buy.






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 09-22-2011, 13:37 Post: 180503
Murf



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 Kubota L3240 L3800 transmission types

In the work you mentioned it shouldn't make much difference, but one thing we've learned about HST units is the serious lack of gearing choices.

Using as an example, the L4400 (because it's closest to the L4310HST that I have at home) in a gear version, you have 8 gears, in an HST unit, you have 3 gears.

That means you spend a lot of time outside of the optimum gear range.


Best of luck.






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 09-22-2011, 14:03 Post: 180504
kthompson



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 Kubota L3240 L3800 transmission types

bhaxel is correct about the pedal and I guess it can be tiring. On my Kubota the lock does hold full speed (does on the only ranges I have used it not used in high). The issue to me is for such spraying where you need to be a steady ground speed trip after trip across a field or such and it is not full speed and you try to hold steady ground speed with your foot moving. As to holding foot on pedal not sure how set up on any other tractor than mine is but am able to keep my leg relaxed with weight on the pedal so no issue.

One area I find the HST is not good with and that is if you are use to using your brakes for sharp or short turns. Think all use your right foot for both brakes and travel pedal and unless you are using travel lock you are not able to use brakes for turning. Only find that issue with tight turns in crops.






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 09-22-2011, 14:13 Post: 180505
AbbasChild



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 Kubota L3240 L3800 transmission types

Murf, I understand that there are three gear ranges--but I as I also understand it (perhaps limited understanding) is that I then have and infinite "gear" selection within those ranges. So I should be able to find the best match to the work I am doing. Just a thought.....






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 09-22-2011, 14:20 Post: 180506
bhaxel



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I think you understand it right, AbbasChild. The HST is like having an infinite number of different gears. Better than just 8.






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 09-22-2011, 15:22 Post: 180508
Murf



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Quote:
Originally Posted by bhaxel | view 180506
The HST is like having an infinite number of different gears.Better than just 8.



I'm going to strongly disagree with that statement.

What you have with an HST is a variable displacement (sometimes called a "swash-plate"Wink yeah right pump (VDP) that then powers a hydraulic motor, that then powers a 3 speed gear transmission. The VDP is the key, in the 'natural' position it has a displacement of 'zero', as you push down on the pedal the displacement moves towards 100% of it's rated volume.

Problem is we don't live in a perfect world, there are parasitic losses at each stage, on top of losses caused by trying to make a hydraulic motor operate over a wide range of speeds. Just like any other motors there's a 'sweet spot' at which it's doing pretty good, above or below that, it may leave a lot lacking.

We've done dyno tests on our units in all 3 ranges in an attempt to convince our customers (who's contract requires HST units) that the GST was a far better choice.

At some speeds the HST is loosing a very significant (double digit) percentage of it's rated horsepower.

From a 'seat of the pants' perspective, we've started buying 50hp machines instead of 40hp units in order to do the same work as previously.



Best of luck.






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