This pic is from a D17, but should be similar.
The "Axle Support" or bolster should seperate from the Front Support after the (4) bolts are removed.
The "Y" shaped thing is the steering arm which is held on to the steering shaft with a roll pin.
There is a seal behind it. It's probably made of leather. If no AGCO dealer nearby, just go to a bearing house and they'll should be able to fix you up.