1The total mass difference between the two groups of hammers with opposite radial direction is not areater than5grams when installed

2、Remove the opening pin at one end of the upper rotor pin shaft, gradually withdraw the pin shaft,remove the pin sleeve and the hammer piece,and place the prepared hammer piece on the pin shaft in its original form;

3、Replace another set of radiallv opposite hammers in accordance with the

above method.Note that two sets of radially opposite hammers must be replaced simultaneously to ensure the balance of the rotor