Main Features 　ZJ40/2250L drive model: mechanical transmission, diesel engine + decelerator, chain compound + cardan shaft ZJ40/2250J drive model: diesel engine + decelerator + belt compound + intermediate axle Main Technical Parameters Model ZJ40/2250J ZJ40/2250L ZJ40/2250LDB ZJ40/2250DB 　Drilling depth （114mm） 4000m 4000m 4000m 4000m 　Max hook load 2250 kN 2250kN 2250kN 2250 kN 　Traveling system structure 5×6 5×6 5×6 5×6 　Fast line diameter φ32mm φ32mm φ32mm φ32mm 　Max. pull of fast line 280 kN 280 kN 280 kN 280kN 　Power of drawworks 735kW 735 kW 735 kW 735 kW 　Speed of drawworks 4F+ 4R 4F+ 2R 4F 1F， Stepless speed regulation 　Model of rotary table ZP275 ZP275 ZP275 ZP275 　Mast JJ225/43-K JJ225/43-K JJ225/43-K JJ225/43-K 　Substructure DZ225/7.5-K DZ225/7.5-K DZ225/7.5-K DZ225/7.5-K