Thanks for the reply ToolCat. For context the motor started rumbling badly so I pulled it to swap the bearings. I removed the back side bearing / sensor and position ring etc it all went relatively smoothly, the rear bearing was totally destroyed when I got to it. The motor now spins much better, but while its out I would like to swap the front side bearing, I'm somewhat afraid it was damaged when the backside bearing let go. Still can't get this pulley off.
I've tried heating the pulley till it smokes (used acetylene) I've tried using a large 3 jaw puller and a harmonic balancer puller that threaded into the M8 holes on the face of the pulley. I have put what seems like unreasonable force into the 3 jaw puller with a cheater bar, with heat, no dice. I soaked it in lubricant just now so maybe I'll come back to it and give it another go later, but its very stuck. It really feels like I'm missing some mechanical fastening like a screw or pin.
In these images you can see the location of the set screw I removed (image one). I could not find another screw for the life of me. Image two shows the following pulley features:
1. Balance hole opposite keyway
2. M8 puller hole
3. M8 puller hole
4. additional balance hole I assume
5. Keyway location
6. face of motor shaft, visibly mushed due to many attempts to remove the pulley with the three jaw puller
Am I missing something? The only thing left I can think to do is either keep cycling cool / hot with oil OR remove the whole motor shaft and rotor and put it on under a hydraulic press to shove the shaft out of the pulley, but that would be a huge pain.