Apparatus for controlling lifting operation

An apparatus for controlling the lifting operation in a construction machine comprising a lower running body including a pair of running apparatuses an upper turning body provided on said lower running body to turn thereon, an operation machine swingably mounted on said upper turning body, actuators for actuating said running apparatuses, said upper turning body and said operation machine, a pair of variable-capacity hydraulic pumps for feeding pressurized fluid to said actuators, control valves provided in relation to said running apparatuses, said upper turning body and said operation machine to control the supply of pressurized fluids to said actuators, and an operation means provided in relation to said control valves to control their operations, wherein it further comprises:

• an operation mode selection means which is selectively set to an ordinary operation mode or to a lifting operation mode;
• and
• an operation speed setting means which, when said operation mode selection means is set to said lifting operation mode, sets the operation speeds of said actuators that vary depending upon the operation quantities of said operation means to be smaller than those of when said ordinary operation mode is set.