There is a manual for front mounted live tool drive, and another for rear attached live tool drive.
They are in the thread that contains many different procedures for a variety of machines.
It sounds like the physical assembly was not aligned during the attachment of the drive pulley.
Follow the instructions for your live tool style to correctly assemble the pulley (in the correct position, as well as within 0.0002" TIR and Flatness)
Then use 4077 to have the motor position the cam-notch correctly, so the fixing pin can lock.