OK thanks heading there now to go see what I can find I will open the fill hole and see what color oil is and what it looks like, I know what water in oil looks like, so I am OK there with that stuff. IF I was to back the machine up on a block, I would chuck the wheels on both side, I am the better safe than sorry type! than taking risks, and wasn't planning to go too high on the rear if I did, just enough to maybe get oil to drain more towards the front of machine! so, if drain plug doesn't come out, maybe could suck out with the hand pump?? Since water is heavier than oil, I would think if I got a line into the bottom and sucked, I would get most water out, or hoping so, if again drain plug doesn't come out easy! I am hoping its NOT water in the gear box BUT if so, my question would be, if I replace all new oil in system, doesn't it flow thru gear box, and maybe possibly mix it up so, a second or third drain would maybe get it out?? or back to water being heavier and it would just sit on the bottom of the gear box?First thing you need to determine is if there is water in the oil. Water in the oil will make the oil appear like cream, an off white or light brown. If the oil is dark then there is no water in the oil..........................There are only 2 plugs on the chain case. The drain plug at the very front of the chain case on the bottom side and the second is the fill\level plug on the side of the chain case behind the front wheel.....................There are two chains in the chain case. The gearbox shaft that goes into the chain case has a double sprocket. One drives the front wheel and the other drives the rear wheel...........................I do not like to see a loader blocked up on the wheels because the loader could roll. It happened to one time and one time was enough.........................I doubt you will get all the oil out by going through the fill\level plug but if that is the only way then give it a try...........................I am more concerned about the oil in the gearbox since you can not drain it I still think the problem is in the gearbox. The only way to tell for sure is to have the side cover off when the loader will not move and have someone watch if the double sprocket coming out of the gearbox into the chain case attempts to turn. There is enough slack in the chains for the sprocket to attempt to turn. If the sprocket does not turn at all then the problem is in the gear box. You could also jack the loader up on that side and see if you can rock the wheels. There should be some back and forth movement in wheel when you rock it.