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Well done 333rocky333 now it all makes sense. The buttons push the iron core of the solenoid in both directions against spring pressure for on and against magnet pressure for off.
So 1 and 3 are power in and 2 and 4 is power out and 2 and 4 also supply the coil.
5 and 6 are aux contacts not sure if used or not. Likely not used.
So since pressing the button gets motor to run 2 and 4 must be energised so either the coil is faulty or there is some extra bit between 2 and 4 and coil not shown like an emergency stop button or guard switch.
Looking at the drawing I see no easy way to assess the coil independent to the contacts 2 and 4 so I would expect it simply the coil burnt out.
So 1 and 3 are power in and 2 and 4 is power out and 2 and 4 also supply the coil.
5 and 6 are aux contacts not sure if used or not. Likely not used.
So since pressing the button gets motor to run 2 and 4 must be energised so either the coil is faulty or there is some extra bit between 2 and 4 and coil not shown like an emergency stop button or guard switch.
Looking at the drawing I see no easy way to assess the coil independent to the contacts 2 and 4 so I would expect it simply the coil burnt out.