Anybody have ideas on what might be wrong? Isn't 4 to 5 amps about
right for a 3/4 hp motor running on 220V?

No. 1 HP = 746 watts. So 3/4 HP is 560 watts, or maybe 600 something with
efficiency considerations. So at 240 VAC (why does everybody still say
220V?) you should be at less than 3 amps.

If you're gobbling 9.5A, sumfing way rong.

Motor wired for 120 VAC?

Motor wired wrong?