I can't really see what's damaged from the pictures provided.
It looks like a crank turns a pinion which meshes with a spur/bevel gear combination which drives a bevel gear.
I think I see teeth missing on the spur gear but can't determine the condition of the other three from the photos.
What needs to be replaced?
If only the spur gear is damaged, perhaps yo can machine off the damage and graft on a new commercial replacement.
EDIT: I downloaded the 4 photos to a photo manipulation program on my computer and still could not make heads or tails of them. Photo Tip:
Clean the parts first, place on a contrasting, solid color background (are you into camouflage?
). An overview is a good idea but provide some closeups of the details that you want advice on.