Single girder overhead crane unpick and wash service the pulley block, should to check crack
Maintenance of the pulley groove
Check the axle hole
Assembly
Pulley shaft must no cracks, wear of shaft neck can't more than 30% of the original diameter, conicity can't more than 5%, if more than this value should be replaced;
Check pulley groove by template, wear of radial should not exceed 30% of the thickness, otherwise should be scrapped. Which not exceed the standard can be patch, and check by template after overhauled, the bottom and the backlash should not be greater than 0.5mm, deviation of the pulley center line and the groove center line should not exceed 0.2mm, rope groove center to the end face contour deviation should not exceed 1mm;
Single girder overhead crane after overhaul, axle holes allow defects which less than 0.25CM2, the depth should not exceed 4mm;
After the assembly should be able to flexible rotation by hand, sideshake must not exceed D1000mm--pulley nominal dia.
