The crane driver climbs into this crane cabin from the top. The roof sliding door must therefore be smooth running and low maintenance. Various drylin® products from igus® are used here: the aluminium precision shafts feature WAS shaft blocks, whilst 4 RGAS enclosed linear housings with liners made of iglidur® J are used for the bearings on the door. Both bearing products are particularly slim and hence save space. The combination of aluminium shafts with iglidur® J liners ensures good running properties.