L 3130 GST : Kubota Review  -- Kubota Tractors Discussion Forum and Review L 3130 GST : Kubota Review -- Kubota Tractors Discussion Forum

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 01-28-2005, 21:59 Post: 105150
jd60kid



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 L 3130 GST

How does a Glide Shift Transmission work????? Is there a left hand reverser?
Aaron






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 01-29-2005, 07:33 Post: 105158
Art White



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There is a left hand reverser that you don't need the clutch to work. It basically is a gear transmission that is shifted by hyraulics. It isn't like the old 4020's that you maybe familier with as the Kubota is locked into a gear so the power loss is less.






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 01-29-2005, 10:03 Post: 105168
Billy

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 L 3130 GST

This info was taken from another forum. Sounds like Kubota has stepped into the electronic age also.

Taken from “New Features of the Kubota Grand L30 Series Compact Tractors”

The Glide Shift Transmission (GST) is original Kubota technology which provides 12 forward and 8 reverse shift-on-the-go gears without the need for clutch operation. The GST has a hydraulic clutch and transmission gears that are changed by the action of an actuator located in the transmission. When the operator initiates a gear change, the GST automatically performs a series of operations that includes disengaging the hydraulic clutch prior to the gear change, changing the gears and then engaging the hydraulic clutch after the change.

The ECU allows for a single shifting lever that actuates a potentiometer signifying the specific gear selection. In the Grand L30 series tractors, the ECU controls a proportional pressure reducing valve, solenoid valves, and performs a gear change by operating a hydraulic clutch.

With this GST system the pressurization of the hydraulic clutch can be set by a proportional pressure reducing valve for limitless stages, all of which is controlled by the ECU. The tractor is equipped with an engine tachometer sensor and a travel speed sensor, as well as a potentiometer that distinguishes the position of the gear selection lever. Based on digital signals from the engine tachometer sensor and the potentiometer, travel speed after the completion of a gear change is calculated, while the travel speed sensor calculates the actual travel speed. Based on the difference between the two speeds, the pressurization characteristics of the hydraulic fluid supplied to the clutch is set. Thus the Kubota GST brings about a smooth gear change by changing the pressurization characteristic in response to the various patterns of gear operation.

Acceleration of the tractor is calculated based on digital signals from the travel speed sensor. Under conditions when the tractor accelerates rapidly, the pressurization is changed to become slower during the pressurization process. When the tractor accelerates slowly, the pressurization is changed to be more prompt.

After the hydraulic clutch begins engaging and the acceleration of the tractor starts, the acceleration is calculated and the pressurization characteristic is compensated. Tractors may be equipped with a variety of different implements according the context of work users wish to perform. In particular, when an extremely heavy implement is attached to the tractor, acceleration does not occur until the compensation begins, which makes gear change time much longer. Therefore the compensation of the pressurization characteristic based on the total tractor weight is realized. The offset can be input using the “Adjustment Mode” of the IntelliPanel, with the correct offset stored in ROM. The ECU of the GST takes in the correction value by communicating with the ECU of the IntelliPanel and compensates the pressurization characteristic.






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 01-31-2005, 15:07 Post: 105313
jd60kid



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 L 3130 GST

thanks alot guys






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 02-10-2005, 16:52 Post: 105901
grassgod

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 L 3130 GST

in simpler words...With my GST I only use the clutch when I am in a tight area & need total accuracy as to when I stop & go but other then that which isnt to often I never use the clutch. I usually select my gear (usually 6) & I start out from a stand still in 6 & just operate in that speed & use my left arm to quickly change directions. If I feel 6 is to fast or to slow for the condition I am in, I just quickly tap the shifter lever either back or forward while moving without the clutch. the other nice thing that I like about the GST is that it has a foot pedal excellerator like a car which obviously an HST doesnt have. I love the GST.






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 02-10-2005, 21:04 Post: 105922
Art White



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The GST originally was introduced by Kubota in the 80's as a hydraulically shifted gear transmission. It is unique! There was a lag in cold weather that was undesireable. Much the same as the 70 series of the case tractors they found that they needed to be sure there was oil pressure on the other side to engage the other gear to not have a lag! When colder the electronics make sure of quicker non hesitant shifts. This is not the same as the power robbing powershifts that need hydraulic power to continue the engagement and horsepower feed to stay engaged!






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