Electric Hoist gear hook check Gear check: Lifting mechanism of gear abrasion: the first stage gear to wear quantity should be less than 10% of the original tooth thickness, the other gear should be less than 20% Running gear wheels wear: the first level is less than the original gear gear to wear thick 15%; Other gear should be less than 25%, the open mouth round should be less than 30% Gear defect inspection: don't may not have crack, broken tooth; Tooth pastry bad mesh shall not be greater than the 30% loss, shall not exceed 10% of the original after the tooth and depth. Hook check: Appearance: the surface must not have crack, thread department, the dangerous section and neck must not have plastic deformation, defects shall not repair welding: dangerous section wear shall not exceed 5% of the original size. Say: shall not exceed 10% of the original size Torsional deformation: shall not exceed 10 degrees.