Hydraulic oil gushing out the drive motor sprocket fill plug

Got to play with my new Deere 693B feller. Made excavator. Saw a bit of a leak on the top bung, went to remove it to seal it up. Hydraulic oil came out like a waterfall. Checked the other side, same. No oil anywhere. Mind you it was only driven little bits, but should that not be full of gear oil? My first thought was the drive motor is leaking into the gearbox.

If it is a motor seal, how long/ expensive to pull and reseal?

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Hydraulic oil gushing out the drive motor sprocket fill plug