Abstract: The present invention provides a swing hydraulic circuit for use in a construction machine, which is free from a shock upon the starting and stopping of the turning frame even though the reach of the working machine is small and from a delay upon the starting and stopping of the turning frame even though the reach of the working machine is large.

Abstract: An outrigger for use in a wheel-type vehicle which can be mounted just behind a front wheel where available height for mounting is very limited. The outrigger comprises a support fixedly secured to an axle of the vehicle, a first and a second link both pivotally mounted to the support and being in parallel to each other, an earth contacting member pivotally connected to both first and second links, the earth contacting member being generally L-shaped when viewed from the bottom, and a hydraulic cylinder pivotally connected to the support and the earth contacting member.