HST vs. Shuttle shift

[5030]

HST is more about non ground engaging implements whereas gear drive is about ground engaging implements.

 

[Tx Jim]

HST is more about non ground engaging implements whereas gear drive is about ground engaging implements.

Ditto plus normally hydrostatic trans requires more fuel to accomplish same task as gear drives similar to auto trans vs gear trans in pickups.

 

[SmallChange]

Maybe somebody here can explain how my shuttle shift is "synchromesh". They say it is, but I think synchromesh means there are little clutches in the transmission that block the engagement of a gear until they can bring the spinning parts to the same speed, so it doesn't grind (all of which is with the clutch in of course). Having owned cars with only two synchromesh gears (2 & 3) and cars like my current one with 6 forward and 1 reverse gear all synchromesh, I do appreciate the difference (no more double clutching and faster multipoint turns).

From the New Holland WM25 manual:
"The transmission shuttle shift lever (1) is located on the left-hand side of the dash panel. The shuttle shift lever is used to engage the transmission into forward or reverse mode while depressing the clutch pedal. Move the lever forward for forward travel and rearward for reverse travel.
NOTICE: Do not attempt to operate the shuttle lever while the tractor is moving, it may cause damage to the synchromesh gear. The clutch pedal must be depressed and tractor motion stopped to operate the shuttle lever."

I can attest that shifting this while the tractor is moving a little will grind.

Can anybody enlighten me how this is synchromesh?

 

[ovrszd]

I'll take a guess.

Maybe the transmission gears are synchromesh but the F/R shuttle isn't?

 

[LouNY]

I believe you will find with a syncro shuttle that when changing directions after clutching and while stopping with light pressure on your shuttle you will not hear gears grinding, then when stopped the shuttle will allow the completion of the direction change and you can start reengaging your clutch.
When using a non syncro shuttle if you even start to engage your direction change before being completely stopped you will be grinding gears.

 

[kenmac]

HST is more about non ground engaging implements whereas gear drive is about ground engaging implements.

Not true. I pull a heavy 24x22x9 2160# disk with my HST.

 

[ovrszd]

Not true. I pull a heavy 24x22x9 2160# disk with my HST.

It would be interesting to see an accurate comparison of efficiency with a 50hp HST versus a 50hp gear drive doing the same ground engagement task. I would suspect the fuel useage after a few hours would be much different. Maybe 25% or more?

I don't recall ever seeing such a comparison.

 

[k0ua]

When I hook a chain to a stump to pull it over, I prefer my hydrostat to any other type of transmission, as I can apply stead, even and ever increasing pressure. No jerking. That is rather "ground engagening".

 

[wwdiii]

I've only used to types of drive, gear and HST (my current Mahindra 3550). HST is the only thing for me. Mine has cruise control but I've never used it. All my working is typically around lots of trees and HST is good for tigh spots and lots of forward and backward with bucket or grapple. HST is just what I need. Its also real simple, low, med, High, set which ever one you need and push the pedal to go forward or push the other one to go backwards.

 

[ovrszd]

I've said this before, maybe in this thread, I've got three tractors with three different transmissions. Each one is perfect on that particular tractor.

 

[k0ua]

I've said this before, maybe in this thread, I've got three tractors with three different transmissions. Each one is perfect on that particular tractor.

Exactly. If one transmission was perfect for all applications, that would be the one that every manufacture would make.

 

[ovrszd]

Exactly. If one transmission was perfect for all applications, that would be the one that every manufacture would make.

Yep, and I can see how the HST would be much preferred for "pineapple harvest".

 

[k0ua]

Yep, and I can see how the HST would be much preferred for "pineapple harvest".

That and the strawberry harvest in January.

 

[Tx Jim]

It would be interesting to see an accurate comparison of efficiency with a 50hp HST versus a 50hp gear drive doing the same ground engagement task. I would suspect the fuel useage after a few hours would be much different. Maybe 25% or more?

I don't recall ever seeing such a comparison.

Below is a comparison of 2 similar older higher HP tractors with gear drive vs hydrostatic. Max drawbar pull in #s 986=5938#s @5.69 mph 186=5032#s @5.95 mph

 

[kenmac]

When I hook a chain to a stump to pull it over, I prefer my hydrostat to any other type of transmission, as I can apply stead, even and ever increasing pressure. No jerking. That is rather "ground engagening".

And, when you back up to an attachment and don't get it just right. I can just walk around to the HST pedal and push it down to go forward some,or back up some. I don't have to climb back on the tractor, place it in gear and try to back up to just the correct spot

I wish my CX105 was HST instead of shuttle

 

[5030]

Not true. I pull a heavy 24x22x9 2160# disk with my HST.

I don't consider a disc cultivator all that 'ground' engaging. Now a Swedish tine cultivator or moldboard plow, certainly. HST's run inherently hotter as well.

Bottom line is of course whatever blows your dress up. My dress prefers a gear drive.:laughing:

 

[k0ua]

I don't consider a disc cultivator all that 'ground' engaging. Now a Swedish tine cultivator or moldboard plow, certainly. HST's run inherently hotter as well.

Bottom line is of course whatever blows your dress up. My dress prefers a gear drive.:laughing:

The thought of you out there operating your gear driven tractor with you dress on, but blowed up around your waist paints a very disturbing mental picture.

 

[Steppenwolfe]

I don't consider a disc cultivator all that 'ground' engaging. Now a Swedish tine cultivator or moldboard plow, certainly. HST's run inherently hotter as well.

Bottom line is of course whatever blows your dress up. My dress prefers a gear drive.:laughing:

Agree 100%, but we say, whatever tilts your kilt...

 

[kenmac]

I don't consider a disc cultivator all that 'ground' engaging. Now a Swedish tine cultivator or moldboard plow, certainly. HST's run inherently hotter as well.

Bottom line is of course whatever blows your dress up. My dress prefers a gear drive.:laughing:

well, It does engage the ground. You can go pretty deep depending on how much cut you put in it.

It all comes down to what you want. I enjoy my 105 hp shuttle and my MX5100 HST. Wish my 105 was HST

 

[5030]

well, It does engage the ground. You can go pretty deep depending on how much cut you put in it.

It all comes down to what you want. I enjoy my 105 hp shuttle and my MX5100 HST. Wish my 105 was HST

Too much parasitic loss with an HST. A hydrauilc shuttle is is almost as good with hardly any parasitic loss.

I very rarely clutch my hydraulic shuttle but then it has no clutch anyway. The shuttle pack is the clutch pack as well.