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with the boom adjusted to an angle of 40° to 50° to the horizontal and without load the upper carriage shall be slewed 90° to the left immediately followed by slewing back to the starting position.
con il braccio a vuoto e formante un angolo di 40°-50° in orizzontale, la torre viene fatta ruotare di 90° a sinistra e quindi immediatamente riportata in posizione iniziale.