Good write up on Kubota transmission offerings

[1930]

I thought my new tractor was a DT. I didnt realize that is was a HSD until reading this. What is this Shift? Understanding Kubota Transmissions — Humphreys' Outdoor Power

Found this whilst looking for answers concerning proper use of my tractor online.

I guess the only benefit really over a DT is no clutch needed to go from forward to reverse. I understand how transmissions work so if someone could explain to me how this setup works it would be appreciated.

Id also like to know why they call it shuttle shift? What is shuttle implying towards?

 

[Scook222]

You can go from forward to backward without using the clutch as long as the tires aren’t moving. I still use the clutch like normal to start a bale of hay but being able to shuttle from forward to reverse baling hay or loading hay saves a lot of time. You can also slowly move from neutral to forward or reverse and slowly let down on the shuttle to take off. It is hydraulic operated to move flow one way or the other to have forward or reverse. They was a good write up on here about a guy rebuilding his a week ago, I believe it was an L48 split for repair. It was a gst but both are more hydraulic based than regular gear transmissions His post explains a lot about the insides of the transmission. John Deere has a power reverser. On old oh tractors they had a TA to slow the speed down when needed. Other brands have names they call it, So I guess the decided to call it shuttle shift to go from forward to reverse. On my L2501 you have to be completely stopped and the transmission stopped to shift from low to high or reverse or from one to the other gear or you will grind gears

 

[s219]

I thought my new tractor was a DT. I didnt realize that is was a HSD until reading this. What is this Shift? Understanding Kubota Transmissions — Humphreys' Outdoor Power

Found this whilst looking for answers concerning proper use of my tractor online.

I guess the only benefit really over a DT is no clutch needed to go from forward to reverse. I understand how transmissions work so if someone could explain to me how this setup works it would be appreciated.

Id also like to know why they call it shuttle shift? What is shuttle implying towards?

I thought you had an L2501? That is either gear (DT) or hydrostatic (HST) and there is no mistaking between those two. There is no shuttle (HSD) or glide shift (GST) option on the L2501.

 

[rScotty]

Id also like to know why they call it shuttle shift? What is shuttle implying towards?

I call the additional clutchless forward/reverse lever on an otherwise gear shift transmission a "shuttle shift" because the maneuver it is built for is using a front end loader to "shuttle" bucketloads of dirt/roadbase/grainmanure or whatever from one place to another.

With shuttle shift, you push a lever - usually on the steering column - and you are instantly going backwards in whatever gear you were just going forwards in a moment before. The reverse of direction is done internally in the transmission using hydraulic clutch packs to engage a gear to a shaft instead of by sliding the actual gear back and forth on the transmission shaft like a manual shift & foot clutch does. But other than being hydraulic and instantaneous, it's internally a lot like a standard transmission with a couple extra parts.

So it is "shuttle shift" because" shuttling" is such a common loader tractor maneuver where you push into a pile to fill the bucket, hit reverse while lifting the bucket and backing while turning around, and then forward to take the load somewhere - and repeat over and over again in a common dance.

BTW, it is considered good form to stop the tractor's motion before hitting the reversing lever, but in practice this varies. Do it at too fast of a speed and it will engage allright - but with wheel spin, and a lot of stress on drivetrain and & driver. Surprisingly, all the above last a long time with this abuse.

Unless you have a FEL & piles to move, there's not much point in having a shuttle shift. But I'm guessing you probably do. Most of us do...

Something similar is being able to shift up and down through the gears without the foot clutch. This is a different aspect of a transmission and is often called "power-shift". It is very common for transmissions to have both power shift and shuttle shift capability.
rScotty

 

[1930]

You can go from forward to backward without using the clutch as long as the tires aren’t moving. I still use the clutch like normal to start a bale of hay but being able to shuttle from forward to reverse baling hay or loading hay saves a lot of time. You can also slowly move from neutral to forward or reverse and slowly let down on the shuttle to take off. It is hydraulic operated to move flow one way or the other to have forward or reverse. They was a good write up on here about a guy rebuilding his a week ago, I believe it was an L48 split for repair. It was a gst but both are more hydraulic based than regular gear transmissions His post explains a lot about the insides of the transmission. John Deere has a power reverser. On old oh tractors they had a TA to slow the speed down when needed. Other brands have names they call it, So I guess the decided to call it shuttle shift to go from forward to reverse. On my L2501 you have to be completely stopped and the transmission stopped to shift from low to high or reverse or from one to the other gear or you will grind gears

Good explanation that I will need to re read, thanks for your time

I thought you had an L2501? That is either gear (DT) or hydrostatic (HST) and there is no mistaking between those two. There is no shuttle (HSD) or glide shift (GST) option on the L2501.

Oh really I? That's what I had also thought from reading posts here. I may have to get you some pictures of my set up.

Now I'm confused again.

I call the additional clutchless forward/reverse lever on an otherwise gear shift transmission a "shuttle shift" because the maneuver it is built for is using a front end loader to "shuttle" bucketloads of dirt/roadbase/grainmanure or whatever from one place to another.

With shuttle shift, you push a lever - usually on the steering column - and you are instantly going backwards in whatever gear you were just going forwards in a moment before. The reverse of direction is done internally in the transmission using hydraulic clutch packs to engage a gear to a shaft instead of by sliding the actual gear back and forth on the transmission shaft like a manual shift & foot clutch does. But other than being hydraulic and instantaneous, it's internally a lot like a standard transmission with a couple extra parts.

So it is "shuttle shift" because" shuttling" is such a common loader tractor maneuver where you push into a pile to fill the bucket, hit reverse while lifting the bucket and backing while turning around, and then forward to take the load somewhere - and repeat over and over again in a common dance.

BTW, it is considered good form to stop the tractor's motion before hitting the reversing lever, but in practice this varies. Do it at too fast of a speed and it will engage allright - but with wheel spin, and a lot of stress on drivetrain and & driver. Surprisingly, all the above last a long time with this abuse.

Unless you have a FEL & piles to move, there's not much point in having a shuttle shift. But I'm guessing you probably do. Most of us do...

Something similar is being able to shift up and down through the gears without the foot clutch. This is a different aspect of a transmission and is often called "power-shift". It is very common for transmissions to have both power shift and shuttle shift capability.
rScotty

I see your response, I'm at the shop now and working but will read thru it tonight. Looks like a well thought out and helpful post. Thanks for your time.

 

[1930]

I thought you had an L2501? That is either gear (DT) or hydrostatic (HST) and there is no mistaking between those two. There is no shuttle (HSD) or glide shift (GST) option on the L2501.

You can see #7 is my shuttle shift lever. No clutch is needed

 

[ptsg]

Shuttle shift needs clutch. Hydraulic shuttle shift, often found in tractors over 60/70 HP, doesn't need clutch to change directions, only to change gears.

If you try to do it without clutch on your tractor, you won't like the sound of it. Don't try it by the way.

 

[ericm979]

You can see #7 is my shuttle shift lever. No clutch is needed

If you shift that range selector without the clutch it will be interesting to see if Kubota warranties the damage. Normally it'd be operator error but you might have an argument because it was mis-labeled on the diagram.

 

[wagne223]

You can see #7 is my shuttle shift lever. No clutch is needed

Your tractor is a DT. You should be using the clutch for any and all speed or direction change.

On hydraulic shuttle models, the shuttle lever is on the steering column where your throttle lever is.

 

[ericm979]

You can see #7 is my shuttle shift lever. No clutch is needed

See the page where it talks about shifting that transmission before you try shifting it without the clutch.