Shuttle shift usage Kubota M7060

[ovrszd]

I am guessing the dry plate is solely to give a cushion for shock loads when shifting the shuttle. The friction material would not be "used" but the shock collar/springs around the center drive splines would still function. Cheap way to do it with existing parts and NOT use a dry clutch engagement.

The way I look at it, it's like a car with a cassette deck, it might be there but it isn't used, and it doesn't affect the operation of the transmission.

This is a very plausible explanation.

 

[sixdogs]

Let me add a little more to this. Again, I don't understand it all but do know Kubota has a hydraulic shuttle that we are talking about and I have one my M7040. Also, I believe they had a nonhydraulic shuttle that behaved the same in that no clutch was needed but it had a dry clutch disk. This would have been on the M6800, the forerunner of the M7040 and M7060. I had an M6800 (hyd shuttle) and remember reading about in in the owner's manual.

Note, this is different from the mechanical "shuttle" on the MX5100 that requires clutching and I have one of those so am familiar with it.

Since I am not familiar with this supposed dry shuttle I'm talking about that required no clutching, it's very possible I'm wrong but I don't think so. Now what do you think?

 

[ovrszd]

Let me add a little more to this. Again, I don't understand it all but do know Kubota has a hydraulic shuttle that we are talking about and I have one my M7040. Also, I believe they had a nonhydraulic shuttle that behaved the same in that no clutch was needed but it had a dry clutch disk. This would have been on the M6800, the forerunner of the M7040 and M7060. I had an M6800 (hyd shuttle) and remember reading about in in the owner's manual.

Note, this is different from the mechanical "shuttle" on the MX5100 that requires clutching and I have one of those so am familiar with it.

Since I am not familiar with this supposed dry shuttle I'm talking about that required no clutching, it's very possible I'm wrong but I don't think so. Now what do you think?

I'm trying to logistically imagine this. If it's all mechanical and requires no clutching, meaning it's solidly engaged, how would it change directions without violent action? A hydraulic shuttle regulates the application/release of hydraulic pressure for smoothness. A mechanical shuttle such as on my Ford 3910 uses the foot clutch to interrupt the mechanical engagement. The hydraulic/torque converter system on my 555A uses the torque converter for smoothness.

There are two variations of mechanical shuttle that we haven't discussed. My 3910 is old school "crash box", no synchronizers. There are tractors with mechanical shuttle synchronized that prevent the gear grinding that I have if I get in a hurry.

There is another type which is Kubota's Glide Shift Transmission. I know nothing about that system. Maybe someone can explain it?

Hope we are not overloading the OP with these variations but they are worth discussion for a future visitor to this thread.

 

[oosik]

I had no difficulties understanding the tranny on my Ford 1700. Just like my manual tranny pickup - use the clutch EVERY time you shift.

Now on my 2009 Kubota M6040 which is hydraulic shuttle shift. I give up and use the clutch to shift range AND tranny. You will only forget to come to a complete stop - ONCE - when going from HI to LOW range or vise-versa. Otherwise - the tranny is "shift on the fly". Forward/reverse - SLOW DOWN - move the lever - there you go.

 

[Jay4200]

I use my foot clutch a LOT.

The hand shuttle is very handy for doing repetitive functions where direct change is required.

I think I've stepped on my L4200GST's clutch pedal 4-5 times in the 12 years I've owned it. Maybe.

 

[sixdogs]

I think I've stepped on my L4200GST's clutch pedal 4-5 times in the 12 years I've owned it. Maybe.

Talk about black magic. Almost no one understands GST. Uhh, me either.

 

[ovrszd]

I think I've stepped on my L4200GST's clutch pedal 4-5 times in the 12 years I've owned it. Maybe.

You are just the man Sixdog and I need to visit with.

Explain the Kubota GST system to us please??

 

[KubotaGirl001]

You are just the man Sixdog and I need to visit with.

Explain the Kubota GST system to us please??

I agree! I wish we could all get together for coffee and talk tractors!!! But I guess this forum is the next best thing

 

[sixdogs]

Anyone know if the GST--Glide Shift Transmission--is still offered? Think it will be around long term?

 

[Oldoak]

Anyone know if the GST--Glide Shift Transmission--is still offered? Think it will be around long term?

Sure it is. I am seriously considering trading in my 1997 Kubota L4200GST for a new, updated Kubota L5060GST compact tractor.

 

[Fallon]

Anyone know if the GST--Glide Shift Transmission--is still offered? Think it will be around long term?

They have been around for a couple decades at least. GST is the only high end option over clutched gear transmission on current machines over 60hp or so.

HST is a more precise easier to use transmission, but has a 15% HP tax. So geared machines & GST are going to be around for quite some time where efficiency matter, like field work.

 

[Farmer495]

They have been around for a couple decades at least. GST is the only high end option over clutched gear transmission on current machines over 60hp or so.

HST is a more precise easier to use transmission, but has a 15% HP tax. So geared machines & GST are going to be around for quite some time where efficiency matter, like field work.

GST is a compact tractor trans, won't find that on M series and bigger, most Ms are over 60 HP.

Interesting on 15% tax on hydro, must be regional thing. All tractors under 60 PTO HP have full sales tax 'here" (15%), anything over has no tax. Transmission has nothing to do with it "here"

 

[Tx Jim]

Neat, didn't know that. I am guessing it's cause the "springs" in it like a regular clutch. Sounds like no way to wear it out if you can't engage/disengage it though.

My dairyman neighbors JD 5603 with a similar damper clutch required replacement because the springs wore out in the damper clutch hub assembly.

 

[ovrszd]

GST is the elusive subject. Several posters here on TBN have them but I've never heard an explanation of how they work.

I'll do a Google search.

 

[sixdogs]

GST is a compact tractor trans, won't find that on M series and bigger, most Ms are over 60 HP.

Interesting on 15% tax on hydro, must be regional thing. All tractors under 60 PTO HP have full sales tax 'here" (15%), anything over has no tax. Transmission has nothing to do with it "here"

He means loss of horsepower, not a physical financial tax.

Easy mistake since you're north of the border and not familiar with lots of things here.

 

[4570Man]

I have no idea how the GST works but they’re light years ahead in operator friendliness compared to a shuttle shift or whatever the term is for base model Kubota transmissions. I’ve unloaded a couple trucks with telhandlers and they behave like a 6 speed automatic transmission set to manual shift. There’s no toque converter in the GST or at least the one I had.

 

[sixdogs]

Anyone have a simple explanation of how the GST works?

 

[Fallon]

GST is a compact tractor trans, won't find that on M series and bigger, most Ms are over 60 HP.

Interesting on 15% tax on hydro, must be regional thing. All tractors under 60 PTO HP have full sales tax 'here" (15%), anything over has no tax. Transmission has nothing to do with it "here"

By tax I meant a HST is 15% less efficient than a gear transmission. A hair less HP ends up at the rear wheels. Not related to the IRS.

 

[Fallon]

Anyone have a simple explanation of how the GST works?

Fundamentally the same way as single clutch automatically shifting sports cars. An automatic transmission with a hydraulically operated clutch instead if a torque converter. Not sure if GST uses planitary gearsets or hydraulically actuated shifting forks, but I suspect planitaries.

The bigger John Deere PowerShift machines are the same way, only with a double clutch. I assume the bigger Kubotas have a double clutch as well.

 

[sixdogs]

Still confusing. So to shift I just shift and forget about the clutch?