HST Transmission

[art]

Wow! do to circumstances this post is or has been carried away! Sorry Dave! The retail price for a 6800 hyraulic shuttle is just under 29000 standard. There are some options that might be not mentioned or on that tractor that aren't included. I think you will like the tactor but offer him a price that you would feel right with.

 

[_RaT_]

"Funny thing is in the John Deere and Kubota brochures that I picked up they both extolled the virtues of the shuttle shift tractors for loader work and HST for other things! "


I've read this comment once before so I just had to check my various Kubota brochures that I have accumulated and would argue that at least from the Kubota brochure's (L30's, L4610 and the L10's up to the L4310) there is no reference extolling the virtues of loader work with FST or GST (both shuttle tractors) especialy as a direct comparision to HST. While they mention how well shuttle FST or GST work for various tasks, it seems to be drawing that conclusion when based or compared to a fully manual transmission. Very few of us would argue that, shuttles are slick. For HST, it is mentioned that they can tackle any task and with the least amount of shock and vibration and greatest operator convenience. I would specifically reserve the manuals for tasks that would involve pulling a ripper(s) for long extened periods of time day after day. The question is, how many folks here do that? For what I think most of the folks do here with their tractors, HST would work very well, but then the other transmissions do as well. It really is a case of to each his own as you mention. Our "job" here is simply to help educate those that ask the questions with our various levels of knowledge and experience we have. Hopefully, sometimes it helps. Rat...

 

[slowzuki]

Ok so on a shuttle tractor if I drive into a pile and don't hit the reverser at the right time it should stall or spin the tires right? I 've only used a shuttle/glide shift tractor in one direction, going up and down the gears without clutch.

I only have a gear tractor to use and when doing precise stuff and loader work on hills it isn't the best tool.

When trying to position stuff it is jerky even with a smooth clutch and 1st gear. You slip the clutch to move part way over a stump or dip in the ground then dump the clutch and grab the brakes to hold it before it rolls anywhere.

It is going to be interesting building my timber frame hoisting members up with it....
Ken

 

[JerryG]

Rat,
I do love my power shuttle, most days I use the lever only. But then some days I just regress back to using the clutch without thinking about it. Yes, there is a slight lag most of the time. If I am doing heavy loader work in tight quarters, for some reason it doesn't seem like there is any lag or very very little.

 

[Tractors4u]

The Deere works just like you discribed the New Holland. Any throttle speed in any gear. Also the Deere has a switch that you can flip and have a choice of two reverser speeds. It affects how quickly/gently that the tractor changes direction.

 

[Libertine]

Tractors4u:

<font color="blue">I don't have a problem with HST, but I honestly prefer gear with shuttle. If there were no such thing as shuttle shift I would probably have an HST. The thing that irks me a little is the HST fanaticism. </font>

Amen.

There's no connection from the engine to the rubber using HST when the engine is off - physical reality - no engine compression to help hold tractor on hill - unarguable. It takes more "work" to transmit power thru a fluid medium than thru gears - physical reality - "work" generates heat - a law of physics. etc. etc. etc. I don't know if cowboydoc's comments are correct about particular tractors, but they sure are consistent with reality. Laws of physics supercede religious fanaticism.

JEH

 

[art]

Andy most tractor companies are fighting over the use of hydro-electrics or just a lever. Deere has made the commitment to chart the new waters in the compacts with hydro-electric controls vs the manual ones. Some day we will know for sure the long term price. I guess if you are to buy a new one more often the switches, controllers,computers real cost will never bother you. Today, here we are finding that many of the farmers are requesting more manual controls do to the electronic problems being had with there bigger tractors. Mind you in this area we only sell a few new articulate tractors a year but many in the 100 to 200 horsepower range.

 

[_RaT_]

"There's no connection from the engine to the rubber using HST when the engine is off - physical reality - no engine compression to help hold tractor on hill - unarguable. It takes more "work" to transmit power thru a fluid medium than thru gears - physical reality - "work" generates heat - a law of physics. etc. etc. etc."

Conversely, it is this very idea that makes the HST so versatile while the engine is on. Instant braking and speed control. While the tractor wil creep ever so slightly on a hill, it also is what allows the tractor to come to a complete stop with no brakes and also what allows one to have virtually instant forward/reverse action. That viscous coupling is precisely one of the reasons why the HST does what it does so very well. I look at parking a tractor on a hill with the engine off a job well done by the parking brake. Rat... /forums/images/graemlins/grin.gif

 

[MossRoad]

<font color="blue"> There's no connection from the engine to the rubber using HST when the engine is off - physical reality - no engine compression to help hold tractor on hill - unarguable. </font>

Then why can't you move my HST when the engine is off? /forums/images/graemlins/smirk.gif

 

[slowrev]

MossRoad,
There is still a fluid connection between engine and transmission unless a fluid bypass arrangment is in place.
Never thought of it before but I guess you can't pull start a Hydro ? A definate disadvantage for a diesel in cold weather /forums/images/graemlins/frown.gif