Is it possible 4-150?

Was taking advantage of the frost to get some chisel plowing done and ran into an issue. Got done with the first field and jumped out to set my transport locks when I got a whiff of hydraulic oil. Started to investigate and found oil coming out of the dip stick tube on the three speed. So ran it back to the house and drained the oil back down to the correct level and ended up with probably the better part of 2 quarts out of it. I can?t recall having to add any oil to it recently so I have no clue where it came from. Now for the other half of the story. When I drained the oil it was pretty hot. Wasn?t boiling but it was warmer than I would expect it to be but at first I chalked it up to the unit being over full. So took off and chiseled another 5 acre piece and checked the level again when I finished up. It had been coming out of the breather again although not nearly as bad as it had been the first time. Looked in the dip stick tube with a flashlight and could see the oil at the very bottom edge of the tube. The oil was warm again so I didn?t bother reading the dipstick. I?ll check it tomorrow once the oil has gone cold. So my question is, is it possible for oil from the differential housing to get into the three speed? That?s the only thing I can come up with for the source of the extra oil. The three speed was never an issue before I had everything apart to do the clutch this last summer and everything went back together alright. It still shifts good and hard in all three gears and doesn?t seem to slip. So I need to find the source of this oil and the source of the excessive heat.

Antifreeze from the oil cooler?

The oil cooler is air to air. There isnt any coolant.

You may want to check fluid levels in the hydraulic and the transmission, Once upon a time long ago we found that two cooler lines that went along the frame to the coolers in front of the radiator were in contact and both had developed holes at that point and one was transferring oil to the other with only a small seepage and dust buildup where the worn tubing crossed.

Sounds far fetched but it had everyone stumped till we located the problem. I don't remember which model Oliver it was.

I already checked the hydraulic unit when I first found the overflow. My first fear was that somehow the cooler hoses got hooked up wrong and it was
running a full circuit from the hydraulics through the three speed and back but they are hooked up correctly. The three speed cooler lines and hydraulic
cooler lines run down the opposite sides of the frame from each other so they never touch each other. The only thing I haven?t looked at yet was the
trans level because I was running out of daylight. I?m going to check all the levels again tomorrow when the tractor is cold and see what it looks like.

Hope you find the problem and keep us informed, thanks.

Yes it is possible for the oil to transfer from the front differential to the O/U through the trunion mount on the back of the O/U. Of course to fix it you must remove the engine and O/U and replace the seals. If the O/U is overfull it will run hot because of the gear train running to deep in the oil.

Probably an 1850. The dipstick tube wore a hole in another line on mine and it was darned close to going through the dipstick tube where it would have transferred.

That was my fear. Looks like I?m pulling the motor again for Christmas. Yay. Thanks for the info.