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Track driven machines useful in slip form and other road paving operations embodying a support frame, with hollow frame members serving as cooling reservoirs for hydraulic fluid, supported by hydraulic cylinders on a pair of power driven, endless tracks. The frame is maintained in a pre-oriented pla

Track driven machines useful in slip form and other road paving operations embodying a support frame, with hollow frame members serving as cooling reservoirs for hydraulic fluid, supported by hydraulic cylinders on a pair of power driven, endless tracks. The frame is maintained in a pre-oriented plane as the machine moves along terrain by a hydraulic fluid control system operating cylinders in response to torsion bar-registered twist of the frame, string-line feeler means and a level controller. Two winches driven by respective hydraulic motors are mounted ahead of each track. Cables wound thereon may be attached to stationary objects to provide auxiliary forward drive(s) for each track, or in emergencies as the replacement drive for a disabled track.

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A paving machine comprising a frame, means on said frame for spreading and working wet concrete into a strip of wet concrete pavement, at least one endless track on each side of said frame for supporting said frame and the machine components mounted thereon, power drive means including a hydraulic m

A paving machine comprising a frame, means on said frame for spreading and working wet concrete into a strip of wet concrete pavement, at least one endless track on each side of said frame for supporting said frame and the machine components mounted thereon, power drive means including a hydraulic motor for driving at least one track on each of said frame to propel said machine forwardly, a pair of cable winches mounted on respective opposite sides of the forward portion of said machine, a hydraulic motor for driving each winch, a first hydraulic line circuit for supplying hydraulic fluid under pressure to one of the track\s hydraulic motor and also the one winch\s hydraulic motor on the same side of said machine either simultaneously or individually, and a second hydraulic line circuit for supplying hydraulic fluid under pressure to another track\s hydraulic motor and also the other winch\s hydraulic motor on the opposite side of said machine either simultaneously or individually, whereby, when cables on one or both respective winches are unwound and secured ahead of said machine, the machine may be propelled forwardly by the tracks alone, the track and winch on one side of said machine and the track alone on the opposite side of said machine, the tracks and winches on both sides of said machine, or the track alone or together with the winch on one side of the machine and the winch alone on the opposite side of the machine.