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Inside the motor compartment is a reversing starter for the motor. This is mechanically interlocked with a lever so that bothe contact sets don't energize at the same time. If this mechanism hangs - nothing works. Rapping it will fix it for a short time but it will hang again. Look into the problem or change the contactors. Sometimes the copper "shading coils" loosen up a bit. These are just heavy copper windings around the edges of the iron armature of the starter.
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