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Re: BW6 gearbox, Bukh DV20, stuck in fwd
Yes, I suspect the internal mechanism has stuck due to the lack of oil.
You might try a very light tapping on the selector lever to try to free it. It might just work, but tap lightly.
To remove the box, you will have to disconnect the final drive (of course) and remove the final drive coupling, them slide the propshaft as far aft as it will go.
There should be enough clearance to disconnect the box mounting bolts and remove the box.
As regards the oil level, that is puzzling. A call to Bukh would be in order, methinks.