转向直径检查
steering turn diameter check
转向液压系统检查
steering hydraulic system check
转向控制开关连续检查
directional control switch continuity check
转向控制开关检查
directional control switch check
转向泵压力检查
steering pump pressure check
转向泵安全压力检查
steering pump relief pressure check
转头检查灯
swivel head examining lamp