Since its a single phase motor that is NOT self starting, to get her turning the seperate slightly out of magnetic phase orientation "start winding" must be temporarily activated (and via relay terminals if a magnetic starter is used, unlike an internal centrifugal switch activation circuit).
It sounds like that part of the motor (its start winding) is okay and works WHEN YOU PHYSICALLY PUSH IN THE CONTACTOR.
THEREFORE, it looks like theres a problem in the starter (relay) and/or its wiring and terminals and connections BECAUSE THE STARTER WINDING CONTACTOR isnt working electrically, ONLY by manually activating it...
It should self engage electrically and pull the contacts in (to activate start winding) and it has control circuitry and connections and wiring, so either some of that is bad or simply the starter relay itslef is just baddddddd
John T My very first job as an EE was for Century Electric Motor Company but that was over 40 years ago and Ive slept since lol so no warranty, see what the more current and practicing engineers and electrical techs have to say
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