Electric Hoist to daily inspection on a regular basis, monthly inspection, annual inspection, etc, in order to ensure the normal operation of the product. I iron check: Surface cleanliness: should be attached with common large amounts of dust Tilt: no more than 1/1000 Joint: weld and orbit can not have crack, up and down and side offset shall not be greater than 1 mm Wear condition: tread wear is not greater than 10% of the original size, the width of the wear is not greater than 5% of the original size The wheel check: Rim: rim thickness of wear amount shall not exceed 50% of the original thickness, flange and rail lateral clearance should be less than 50% of the width of the wheel tread. Tread: according to tread the diameter should be less than 5% of the original size, measurement of wear surface diameter difference should be less than 1% of nominal diameter, roundness error should be less than 0.8 mm Appearance: can not have crack, damage.