Forgive my Ignorance -- Shuttle Shift / FEL Use

[ovrszd]

Not familiar with this specific tractor. So I'll just offer general information.

There are two types of Shuttles.

Synchro Shuttle or Mechanical Shuttle which is simply a gear shifting lever that is used to change direction. Clutch application is required. Older gear shuttles might not even be synchronized. My 1984 Ford is not synchronized.

Power Shuttle or Hydraulic Shuttle or Power Reverser as John Deere calls it is a lever that actuates a hydraulic clutch system that changes tractor direction. No foot clutch action is required. No gear grinding. Very smooth direction change. Lot easier to use in repetitive situations such as FEL work. My 2012 Kubota uses this system.

When comparing a Shuttle system to an HST system there are two large differences. The HST is much easier to operate. The Shuttle system takes much less HP to operate.

 

[Gary Fowler]

The best gear tractor transmission I ever drove was my Yanmar 4220 with powershift. It had hydraulic clutch and 4 ranges with R-N-1-2-3 in each range that could be shifted up or down with a hand lever without clutching OR you could manually clutch it if you wanted. It was faster than a HST in long distance hauling because the 1 gear was powerful enough to load the FEL and 3 was faster than any HST was without shifting ranges which requires a full stop on most HST tractors. I don't know of any tractor now that uses that type of powershift transmission other than industrial types and dozers..

 

[Gary Fowler]

Oh and the Yanmar would go from forward motion to reverse without stopping, so if you unintentionally shifted from any of the 1-2-3 forward gears it had to go thru neutral then into R and it would then just start spinning the tires in reverse. You really had to hang on or go over the steering wheel when this happened. As far as I know, it never damaged anything when this happened.

 

[Navasot]

Never have liked powershuttles... not responsive enough to much lag between shifts

 

[oldpilgrim]

another advantage of the hst:

you can vary the travel speed of the tractor, infinitely, without changing the speed of the pto.

 

[brasco426]

another advantage of the hst:

you can vary the travel speed of the tractor, infinitely, without changing the speed of the pto.

Good Point!

 

[ovrszd]

Never have liked powershuttles... not responsive enough to much lag between shifts

Not sure what you are talking about, hydraulic shuttle or powershift?

 

[ovrszd]

another advantage of the hst:

you can vary the travel speed of the tractor, infinitely, without changing the speed of the pto.

To change travel speed of a gear tractor while using the PTO it's done with the transmission selector. And it's a specific change in speed, not infinite like the HST.

Flip side is as long as the engine speed stays the same on the gear tractor it will always maintain exactly the same travel speed, uphill, downhill, flat ground, whereas the HST will not.

Guess that's why they make so many varieties. Something for everyone.

 

[mike69440]

its all the same other than you have a forward and reverse shifter that you still clutch between... gear transmissions not being synchronized helped people not burn clutches as easy... now with syncros being so easy to shift and made to go forward and reverse with ease it also makes it very easy for someone to ride the clutch or rest their foot on it when doing a lot of back and forth work also not shifting properly or to hastily ... iv seen it many many times... you have got to be disciplined to keeping your foot of the clutch if your not shifting.. not shifting fast and dumping the clutch at high rpms with heavy loads or into a pile of dirt... a lot more to learn than people think with the shuttles

I catch myself being a little rough on my Max28 shuttle. with thousands of hours on gear tractors, I should know better.

 

[Navasot]

Not sure what you are talking about, hydraulic shuttle or powershift?

powershuttle... its what most call a hydraulic shuttle.. iv grown up knowing it as powershuttle... also drove powershifts and power splitters... they have their place