PURPOSE:To efficiently overhaul an automobile engine by supporting pivotally a pair of holding arms so as to be turnable upward and downward in a free- running work vehicle, and providing a hydraulic press rupture machine. CONSTITUTION:In a free-running work vehicle, booms 10, 12 having cutting pliers-like opening/closing work tools 32, 34 in the tip are installed so that can rotate and turn upward and downward. In a car body part 14 of this vehicle, a pair of holding arms 20R, 20L for holding down an automobile body to be overhauled from the upper part are supported pivotally so that they can turn upward and downward. Also, a hydraulic press rupture machine for placing an automatic engine to be overhauled between and breaking it is provided between a pair of holding arms 20R, 20L. Its rupture machine is constituted of press rupture rams 26, 27, a hydraulic cylinder device 28, etc. In such a way, the safety and the efficiency of a work can be improved.
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