... -15tons track jack1. model max lifting max hooking jack-up height jack-up feet high hook QD5 5tons 2.5tons 160mm 345mm ... , an axle railway bridge installation, and vehicles, equipment, heavy lifting with, the structure is simple, easy to use, safe and reliable ... use a joystick to move up and down swinging the claw, with the tooth claw, promote the linkage with rack up or down, and then the weight.