Originally Posted by
David L Morse
Well, a single phase induction motor has to have some means of starting. It's certainly possible to use a single capacitor for both starting and running. This is called a Permanent Split Capacitor (PSC) motor. There's no centrifugal switch. The main disadvantage of this setup is fairly low starting torque, but a jointer/planer doesn't offer much of a load at start.
If your cutter head is jammed up a bit though the extra load could be beyond the starting capabilities of a PSC motor so be sure to check this.
Also, I assume you have already checked this but loose pulleys or belts can show similar symptoms.