i think it was after goku came back with his tail and turn ssj3 when he revert back to his old state goku look at the earth and become a golden great ape in episode 30. GOKU TURNED SSJ4 IN EPISODE 35, SHORTLY AFTER HE WAS A GREAT APE.
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When do you mean? If you are talking about just typically then yes, he did go super saiyan 4. He did mostly in Dragonball GT.
Goku turn into kid Goku in episode 1 or Dragonball GT because Emperor Pilof accidentally wished for Goku to be a kid again.
Dragonball GT Episode 1: Secret of the Dragon Balls
Episode 230 "Super Saiyan 3"
Dragon Ball Z Kai episode 47