Posted by pburchett on June 28, 2016 at 17:54:38 from (12.205.253.163):
My Kubota (MX5200HST) front differential is a closed system with Kubota's Super UDT2 hydraulic/ transmission fluid in it. After working the machine and getting the fluid in the differential hot it will build up a substantial amount of pressure. If I vent the pressure and let the machine cool it then has a vacuum on the differential.
Will this pressure become a problem later with it wanting to force fluid around the seals and leak? On the other hand would the vacuum lead to contaminants being drawn into the seals? I was leaning towards a breather vent drilled and tapped into the fill plug/bolt to equalize the pressure as trucks do or would this let moisture in the air contaminate the differential.
Kubota recommends either their Super UDT2 or 80W-90 gear oil in the differential. Would gear oil cause less pressure to build? I do not foresee a difference as there is only a certain amount of fluid (2 gallon) and air in the system? Could someone with more experience comment on fluid choice, as I was thinking of going to gear oil, but then the rear end runs in the UDT fluid as does the transmission.
This tractor needs to last 70 years or at least until I get time to restore the old Ford 640.
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