Sprockets--A Little Robot

By Alexander Key.

Apparently this is the start of a series, though I've never seen the others: Rivets and Sprockets and Bolts.

Poor guy. His brain is only semi-positronic. I wonder if Asimov gave permission? There was also a kid who flew his father's helicopter (normal transportation for the time) for him; the father was a famous scientist, very distracted, and the kid demonstrably drove better than the father did, so they got him a special license.