GST transmission

littlediesel · Jan 2, 2005

Are the new 12 speed GST transmissions much better than the older 8 speed GST transmissions? Is one transmission better as far as reliability or problems.

I think the new GST transmissions are electronic where the older ones are hydraulic. What is better? /forums/images/graemlins/confused.gif

Jon

Grassgod · Jan 2, 2005

I have the new 12 speed Gst. I love it! I have had no problems & its nice to have more variety of speeds. I think the 8 speeds were indestructable & so are the new 12 speeds.

Rick_Morrell · Jan 3, 2005

Jon:

I would have to agree with Grassgod. I also have an L3130 with the 12F/8R GST and like it a lot. So far (67 hrs) it has given me no problems, although I would not expect to see any at this point. You are correct that the new transmissions are electronic. It appears to function much the same as an electronic powershift transmission that you would find on a larger piece of equipment.

Rick

WhiteRock · Jan 3, 2005

Would you gentlemen care to describe how a GST operates?

I am familiar with the collar shift transmissions.

I have a hydraulic shuttle shift transmission. 4 gears X 2. I guess that makes it 8F/8R. I can shift from forward to reverse with no clutch. But I have to use the clutch to shift through gears 1 - 4. I have to stop the tractor to shift between low and high.

How is the Glide shift different?

Thanks.

Grassgod · Jan 4, 2005

With the glide shift...you dont need to use the clutch to change gears. you just slide the shifter lever into whatever gear you desire wether your stopped or moving it doesnt matter with no clutch.

SkyPup · Jan 4, 2005

It's basically a hydraulically activated clutch with a 12 speed manual transmission that gives you the best of both transmission types, Manual and HST.

Our 3130 has over 600 heavy duty hours on it now with our GST and it is flawless, I like it alot.

Be sure to use Super UDT hydraulic oil in either a GST or HST for the best performance and protection.

I have both of the 2004 Kubota SAE publication papers on the new GST transmission and their Super UDT hydraulic oil that gives the technical description of the entire transmission and the superior qualities of the Super UDT.

WhiteRock · Jan 4, 2005

Thanks. Sounds pretty neat.

How does it respond if you down shift under load (can you do that)? If so, is it a pretty smooth shift? Does the tractor's momentum continue?

Is there any such thing as a hydraulic shuttle GST? Please don't count HST /forums/images/graemlins/smile.gif, I know it is getting real close....

It sound a lot like the hydraulic shifter in my shuttle. I am amazed at how well that performs.

SkyPup · Jan 4, 2005

Down shifting under load is no problem at all with a GST, it just keeps on humming.

The ECU calculates the amount of load the engine is under and changes the rate of shift speed according to a preprogrammed ROM chip which contains shift speed and load graphs, the fastest engagement is when you are standing still under no load and put it in gear, the slowest response is under load downshifting.

Grassgod · Jan 4, 2005

See now you learn something everyday...I had noticed there are times it shifts faster but never really new why. It is a 1 second difference but when you spend as much seat time as I do, you notice it.

littlediesel · Jan 4, 2005

I wonder how well the electronic solenoids will last many years down the road? The hydraulic pistons in the old GST have performed very well. Time tested!

I think the electronics could be as problem in many years to come!

Jon