Personally, I need to know more about how you determined that you have coolant in your hydraulic/trans fluid.
Exactly how much coolant have you found in your hydraulic/trans fluid?
A trace? A quart or 2? Several gallons?
Where and when did you find the evidence of this contamination?
Not trying to be a dink, but did you perhaps use a "dirty" drain pan that had leftover coolant residue in it?
Did you perhaps drain the ENGINE oil, and somehow manage to confuse it with the hydraulic/transmission fluid?
ONLY the Engine Oil COULD have coolant in it, if the cylinder liners are cavitated, or if the engine oil cooler is internally rotten or cracked and leaking.
As for direct or indirect coolant contamination getting into the hydraulic/trans system - well, it's just NOT possible.
Either you (or someone) directly added coolant into the hydraulic/transmission reservoir sump casing (during a refill, top-off, or a vandalism)...
-OR-
Somehow, I suppose that someone could have mistaken the horizontally mounted oval hydraulic expansion tank that is located up front for a coolant tank. Not sure how anyone would do that, but I guess anything is possible if a person doesn't know what the heck they are doing or what they are looking at and they just "assume". The engine's coolant radiator is located directly next to the hydraulic fluid cooler. One could (I suppose) mistake them for being inter-connected, which they are NOT, and stupidly have added coolant into the hydraulic system via the hyd cooler or the hyd accumulator expansion tank.
Additionally, like "buickanddeere" said, is your radiator overflow hose connected to your hydraulic pump case drain line that runs from the front pump to the hydraulic expansion tank? Lord, I sure hope not, but I guess it could be a possibility!
Regardless, as previously stated by other people here in the forum, there is NO connection (direct nor indirect) between the engine's cooling system and the hydraulic/transmission system on any JD 2630.
I am a former JD tech and I've also owned a couple of JD 2630's myself over the years, so rest assured, I'm not talking out my rear here.
Whatever you do, get that old contaminated fluid drained from your hydraulic/transmission system and replace it. Now would also be a great time to replace your hyd canister filter as well, since it requires fully draining the sump to do it. P.S. be sure to remove all of the drain plugs when draining the sump case. If memory serves me, I believe there are 2 of them, but check your Owner's Manual to be certain, as its been a while since I've had my 2630's.
Let us know what you find, because we will surely all be interested.
Hopefully this makes sense. It is wayyy past my bedtime when I wrote this.
Good luck and good night (or morning, as the case may be),
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