Abstract: A change-over apparatus of exhaust gas for use with a vessel of a dump truck or the like comprising a box-like housing having an inlet for the exhaust gas and first and second outlets, a first pipe mounted in the first outlet and open to the atmosphere, a second pipe mounted in the second outlet, a third pipe telescopically mounted on the second pipe and movable between a raised position where the vessel is in its dump position and a lowered position where the vessel is in its carry position and in which the second outlet is brought to a communication with a plurality of hollow ribs integrally formed with the vessel, and a shutter plate for selectively closing the first and second outlets in response to the movement of the third pipe.

Abstract: A device for adjusting the rotating angle of a vessel of a dump truck which includes a detent having a guide recess, which is pivotally connected to the vehicle body said detent being connected to a spool of a control valve operated by an operating lever. An arm is pivotally connected to the vehicle body and has a cam follower journaled therein, and another arm is secured to the rod of a cylinder and has a bolt which is secured to said another arm and is adjustable in height. Thus, the shock is absorbed when the vessel is travelling upwards and is stopped.