The front cylinder is a multi-stage telescopic hydraulic cylinder, which is mainly used for dump trucks, and has multiple linking methods such as double hinged shafts, earring hinges, and double earrings. 　　Sleeve diameter 75-278mm 　　Maximum stroke up to 11m 　　Maximum rated pressure up to 24Mpa 　　Maximum car length up to 12m 　　Maximum load up to 110t 　　4TG-180*4640ZZ 　　level 4 　　A cylinder bore 180mm 　　Travel 4640mm 　　Cover type