Cat #12

There is no way for engine oil to get to the transmission. My guess is that the transmission oil was filled with the front of the machine pointed downhill some. Nothing to worry about. If you decide to change the transmission it takes 50w mineral oil. Do not use 80w-90 as the ingredients will cause harm to the bronze bushings. It takes 13 gal if I remember right. Also there is a washable filter on the lower front right side of the trans case if you are sitting under it. Also there are two drain plugs for the trans. You only fill the rear, it will pump up to fill the front housing.

The 70Dxxxx is an oil clutch model. It uses the main engine sump as a common reservoir with one of the main engine oil pump sections supplying circulating engine oil to the oil clutch with return back to main engine sump. There is no corkscrew oil return thread on the oil clutch version engine crankshaft.
There is a seal on the transmission input shaft #5H0033 that would allow engine oil from the clutch section into the transmission if it fails.
There is no seal on the power shaft that would transfer engine oil to the transmission.
Original transmission oil was a straight mineral oil SAE 90.

I stand corrected.

Had to take a double look at that one myself. Coffee hadn't kicked in.

Thanks for the replies.... OM are we talking about the upper transmission shaft that mates up with clutch discs in the bellhousing ? That is where it would be in direct contact with engine lubricating oil? That seal (5H0033) looks to have double lips... one facing each direction.
Thanks Again

Yes, that would be the one. Engine oil flying around in there and fed to the brake would be able to leak along the shaft past the seal.

Thanks OM looks like it is time to get the wrenches out! Another quick question can I use 15-40 oil in the engine on this machine? (It is the 31😎
Vernier