The present invention is directed to a machine for filling a trench. The machine comprises a tub, release assembly, and a hopper. The tub mixes a material to be filled into the trench. The release assembly releases the material into the hopper and the material flows from the hopper and into the trench. The machine moves parallel to the trench as the trench is being filled. A compactor assembly may follow behind the hopper and pack material into the trench. An operator controls the movement of the machine from an operator station on the machine.

A mixing system for mixing ground or soil with an additive in a batch mode, the mixing system comprising: a moveable mixing device for mixing the ground with an additive, and moving mechanism, such as a moveable arm; a cargo body positioning area for receiving a cargo body; the cargo body positioning area and the moving mechanism being configured in position such that the mixing device can be positioned in the ground through an upper open side of the cargo body; the mixing system furthermore comprising information obtaining system for automated obtaining information regarding the load of the cargo body for allowing the mixing system to mix the ground with the additive, taking into account said information.

The invention relates to a hydraulic system, preferably for piloting and actuating a two-cylinder thick matter pump. The hydraulic system comprises a tank (68) for receiving hydraulic oil, a primary circuit having at least one hydraulic consumer (AH, MH) which has at least one primary pump (36, 38, 61, 70), which is loaded with hydraulic oil via a first suction line (42), and is connected on the outlet side to at least one first return line, and which has a suction/return filter (40) which communicates with the first suction line (42) on the outlet side and is loaded on the inlet side with return oil from the at least one return line. A special feature of the invention consists in that the first suction line (42) communicates with the tank (68) via a separate replenishing suction line (86) and a suction filter (66), wherein a replenishing suction valve (88) which is preloaded in the direction of the suction filter (66) is arranged in the replenishing suction line (86).