Kubota owners

[parrithead]

I have a ZG222. It is about 3 1/2 years old with around 120 hours on the meter. Problem is that it seems like only the left control arm is working. The right arm will control, but i would guess it to be at maybe 10% of what it used to be. I know that this unit only uses 1 hydro, but do not truly understand how it works. I checked all of the fluids and they are fine. I had changed the hydro fluid at 50 hrs as a precaution. The unit is greased very 4-5 hours. I have not had any issues at all with the mower. Has anyone else has a similar problem? Or maybe can shed some light on my issue or a least point me in the right direction.

Thanks