Machine description: 28 CRANE TRUCK, USTC 28L, REAR MOUNT BOOM, BOOM SERIAL NUMBER X40004096, BOOM HEIGHT 90', WORK HEIGHT 85', BALL, TANDEM AXLE CHASSIS, CATERPILLAR, EATON FULLER, 8LL, SPRING SUSPENSION, 264 " WB, ... more info about the 1999 Sterling L7501.