The four-column pressing machine and leveling machine ensure the assembling precision of the tower crane. ... duty upright lathe(5m), bending machine, four-column pressing machine, leveling machine, shearing machine, worm-gear gear griding machine etc. heavy duty equipments ... angles, basic mast section, telescopic cage, upper/lower slewing table, mast section, tower head, jib, counter jib and anchorage ...