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