CRANE OPERATOR AND RIGGER CONTROLS

TM 9-2350-238-10 CRANE OPERATOR AND RIGGER CONTROLS–CONTINUED Key 19 2 0 21 2 2 23 24 25 26 27 Control or Indicator Traversing foot pedal Hydraulic ram hand pump handle Quick disconnect coupling with cap Tow winch brake pres- sure selector valve Boom winch brake pres- sure selector valve Boom cylinder Boom winch hydraulic motor Boom cylinder bypass valve Intercommunication control box Function Operates a three-position hydraulic valve to control traversing crane cab by releasing traversing brake and traversing cab clockwise or counterclockwise. It is spring-loaded to return to center position. Operates a double acting hydraulic ram pump to release tow winch, boom winch, and traversing unit brakes and to raise spade when vehicle hydraulic system pressure is not available. Provides a connection for accessory hydraulic hose that is connected to impact wrench selector valve to allow raising spade with hydraulic ram hand pump. A two-position valve. When valve knob is pushed in (normal position), system hydraulic pressure will release tow winch brake. When valve knob is pulled out (emergency position), hydraulic ram hand pump hydraulic pressure will release tow winch brake. A two-position valve. When valve knob is pushed in (normal position), system hydraulic pressure will release boom winch brake. When valve knob is pulled out (emergency position), hydraulic ram hand pump hydraulic pressure will release boom winch brake. Two hydraulic cylinders that raise and lower boom. Plays out or retrieves cable. A two-position valve. When handle is pointed to left (normal position), valve is closed. When handle is pointed forward, valve is open and hydraulic pressure in boom cylinders is released to lower boom. Valve must be opened slowly to pre- vent damage to equipment. Provides interphone and radio control facilities for crew. 2-11