L2850GST tyranny and steering issues??

[eyeballer]

I purchased an 89 l2850 get with fel and front snowblower attachment.it wont go forward or backwards in any gear until i raise tge loader all they way up,then it starts moving??never have seen this..I changed the hydraulic oil and filters.any ideas anyone?

 

[David_Kb7uns]

Not knowing how they did it back then, but my L3130GST with power steering uses the power steering section of the hydraulic pump to power the steering and the GST transmission shifting.

Good idea to get a service manual so you can trace the hydraulic circuit and the GST pressure regulating valve.

The parts breakdown shows the L2850GST has a dry plate main clutch with wet shuttle clutches and that power steering was an option but the GST requires a dedicated regulated hydraulic flow usually from the steering side of the hydraulic pump, so transmission and steering problems may be connected.

Make sure you have the correct KUBOTA filters on the transmission circuit as there is usually not a proper cross for many Kubota transmission filters and Kubota Super UDT is usually required in the GST transmission for proper shifting fork/valve body action and for the wet shuttle clutches to function properly.

David

 

[eyeballer]

I replaced the oil with super UDT2 and Kubota filters...no change with those.

 

[David_Kb7uns]

Need to check if you are getting flow to GST transmission valves and F/R shuttle clutches and if you have power steering flow to the steering box.

David

 

[eyeballer]

Kind of thinking it's getting air in that side of the pump.the fluid is foamy in tranny. Once you move it around a bit it works ok.like it reprimes?

 

[Rock knocker]

Sorry to hear about the tyranny you're dealing with.

 

[David_Kb7uns]

Sucking air would be a problem, check the suction line, some of the Kubotas had a section of rubber hose that would age and crack and let air in.

David

 

[eyeballer]

I replaced that too..next is the seals and o rings in the pump.see how that goes.

 

[charisteleios]

I replaced that too..next is the seals and o rings in the pump.see how that goes.

I have a very similar issue. When I turn my wheels all the way to the stops on one side or the other, the trans stops and doesn't start working for a few seconds. It sounds like either the pressure is getting to high and the relief valve is opening up or its priming for some reason.

Did you have any success fixing yours?

 

[eyeballer]

I did get it fixed..was the hydraulic pump. The shaft was striped and the inside of the transition gear too..replaced both the pump,and gear/bearing..the bucket side of the pump was priming the hydro/steering side..because of the striped end.