Service Lubrication shows a number of grease zerks.
A - King Pins
B - Tie Rod Ends
C - Lower Brake Pivot Tubes (can't find this one on mine as mentioned above)
D - HST Models: Hydro Pedal Linkage Shaft
E - HST Models: Upper Brake Pedal Tube (PITA to get to)
In the next section of the manual they also call out the pivot arms on the 3 pt.