Lot of this going around. All motors seem to be billed as "high torque" lately. Try another motor, a TM one. The motor may have the torque but the angle of engagement may be wrong. Pinion gears from different companies seem to be very slightly different. This starts to be a factor from M120 up. Reason I bring this up is that I just had a CA M15 that wouldn't cycle. After checking everything else, I finally swapped motors and put in a TM EG1000 and it cycled fine. I assumed the motor was shot, but I have been messing around with it and it seems fine too, same as the OP. It is leading me to believe that the pinion gear is slightly different than the TM one. Odd though, it is the original CA "high torque" motor.
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