Boom cylinder with both ends of the rack and the movable arm is connected with a tilt phenomenon, bearing width is too small, or improper assembly instructions to adjust the clearance between the side wear, bearing width should be increased; the boom cylinder bottom discharge sedimentary material accumulation and boom cylinder bottom lateral wear, that the deposition material accumulation is serious, the larger friction rotation.

The improvement measures are as follows: 1. increasing the supporting width, and the general supporting width is 1.2 to 1.5 times of the diameter of the piston rod. 2. in the process of assembly, make full use of the adjustment pad to ensure that both ends of the boom cylinder and the frame and the arm of the fit gap and neutral, improve the cushion material wear resistance. 3. improved discharge structure; increasing discharge plate opening distance H1 and the angle alpha, reduce the accumulation of blanking, blanking to smoothly discharged naturally; increase the boom cylinder bottom is connected to the host at the discharge distance of H2, in order to facilitate the discharge of large size stone. Use the instruction manual to specify the requirement for periodic cleaning of stored material. The piston rod did not bend again after the improvement.