Step carefully in there. That transformer has a bunch of taps for sure. I would suggest removing and checking the coil voltage of one of the contactors, On my machine they were all 220V, and powered by the line voltage. The wheel motor was direct wired, no transformer in that line. The Workhead motor is driven by the transformer, and on most machines is DC not AC. Check the motorplate to be sure. Since you have the transformer, I would guess workhead is DC. AS the AC units have a VFD. If you have a dial switch next to the power cord connection of the Workhead, you have DC workhead. That switch is a reversing switch, for Internal/external grinding.
Note that I have the older model so your model may not be similar. Check those contactor coils first if 440 you will need to install a 220 to 440 transformer at the head of that circuit. Also you will need to adjust the overloads for the wheel motor, mine are adjustable anyway, half the voltage need twice the amps.