Most of those pins are peened over somewhat, making the ends of the pin bigger than the part that goes through the gear and shaft. Grind the ends flush with the gear, and support the gear on a V block while using a starter punch to get the pin moving. Then drive it on through with a proper sized pin punch.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!