When you tear off the label, the material will show " VOID" mark on the surface. It is kind of tamper evident way.Our silver or white polyester VOID labels, also known as Warranty Labels, feature a tamper-evident surface that leaves a "VOID" pattern on the label and the surface when the label is lifted. This tamper evident seal is great for use on electronic equipment, rentals, or any other items when you need to prevent undetected access. These void labels cannot be switched to another piece of equipment without detection. A resin ribbon is required for printing on the VOID labels.
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(1) check the boom cylinder leakage situation. The easiest way is to raise the boom to see if there is a clear free fall. If the whereabouts of obvious removal of fuel tank inspection, seals have been worn should be replaced.
(2) check the control valve. First clean the safety valve , check whether the spool wear, such as wear and tear should be replaced. If the safety valve is still installed after the change, and then check the control valve spool wear, the use of the gap is generally limited, serious wear and tear should be replaced.
(3) measure the pressure of the hydraulic pump. If the pressure is low, then make adjustments, the pressure is still not adjustable, the serious damage to the hydraulic pump.
In the maintenance of the following three points to find the cause of the malfunction, and the system to improve: