Help!!! Hydrostatic Fluid on Kubota 7200HST

[biplane]

Please help - I'm clueless. My hydrostatic transmission started slipping yesterday on my Kubota 7200 HST. I checked the fluid and it's so milky I could pour it on my Cheerios. I don't have a manual for it, but I thought I would change fluid and see if that fixed the slipping problem. I went to the dealer today and bought 4 gallons of oil, and a filter. They pointed out 3 drain plugs on a similar tractor. I found 1 on each side of the rear axle and 1 near the mid PTO. Out came about 2 gallons of milk. Are those the only plugs??? Is the lubrication in the front of the tractor a separate system? If not, where do I find the drains on the front?
I changed the filter, which is mounted vertically and inverted under the panel on top of the transmission. Now, and this shows my ignorance, where do you add oil? There is a 1/2" bolt right next to the filter, but I can't image I'm supposed to pour 4 gallons of oil into that bolt hole.
Please help as I need to get this tractor back up soon!
Thanks!!!!

 

[DieselPower]

Sounds like you have some major water contamination in your oil. If it's as bad as you say I would probably drain and fill as you planed on, run the unit for a while and then drain and refill again. You need to flush as much water out of the system as possible. Hopefully not to much damage has been done. One suggestion I would make is to use a UTF oil that has a good water demulsability rating. This type of oil will let the water seperate and sink to the bottom of the sump where it can be drained.

 

[biplane]

Thank you. I'll plan to run it for awhile and then drain/fill again.

Can anyone give me further information about my questions? How many drain plugs and where? Where is the fill point?

Thanks!