An apparatus comprises an offset box housing, a rotating shaft, and an offset chain guide member. The offset box housing includes a top end, a bottom end, a first side, and a second side. The rotating shaft is disposed within the offset box housing, is proximate to the top end of the offset box housing, and includes a first end and a second end, the first end of the rotating shaft is proximate to the first side of the offset box housing. The second end is proximate to the second side of the offset box housing. The rotating shaft including a first sprocket coupled to the rotating shaft. The offset chain guide member guides a chain between the first sprocket and a second sprocket that is coupled to both the offset chain guide member and a trenching mechanism that is disposed offset with respect to a trencher.

A trencher includes a drive mechanism, a detachable digging box, and a digging support member. The detachable digging box receives power from an intermediate drive member transferring power from the drive mechanism to a trenching chain coupled to the detachable digging box. The drive mechanism and the detachable digging box are coupled to the intermediate drive member. The digging box support member includes a first end and a second end. The digging box support member is pivotably coupled to the detachable digging box at the first end of the digging box support member via a detachable coupler and pivotably coupled to a frame of the trencher at the second end of the digging box support member. The detachable digging box is detachable from the digging box support member via the detachable coupler without decoupling the intermediate drive member from the trencher.

The invention relates to a slurry wall cutter for producing vertical ground trenches, which can be connected to a carrier apparatus, comprising a frame, a motor unit and a drive unit which is releasably connectable with the frame, wherein the drive unit comprises a carrier structure, at least one gear mechanism arranged on the carrier structure as well as a cutting tool for crushing ground material, which connected to the gear mechanism and drivable by the motor unit, wherein the motor unit is releasably connectable to the drive unit and wherein the frame and the drive unit respectively comprise guide means which are configured in such a way that the drive unit can be pushed laterally into and out of the frame.

A trencher includes a drive mechanism, a detachable digging box, and a digging support member. The detachable digging box receives power from an intermediate drive member transferring power from the drive mechanism to a trenching chain coupled to the detachable digging box. The drive mechanism and the detachable digging box are coupled to the intermediate drive member. The digging box support member includes a first end and a second end. The digging box support member is pivotably coupled to the detachable digging box at the first end of the digging box support member via a detachable coupler and pivotably coupled to a frame of the trencher at the second end of the digging box support member. The detachable digging box is detachable from the digging box support member via the detachable coupler without decoupling the intermediate drive member from the trencher.

An apparatus comprises an offset box housing, a rotating shaft, and an offset chain guide member. The offset box housing includes a top end, a bottom end, a first side, and a second side. The rotating shaft is disposed within the offset box housing, is proximate to the top end of the offset box housing, and includes a first end and a second end, the first end of the rotating shaft is proximate to the first side of the offset box housing. The second end is proximate to the second side of the offset box housing. The rotating shaft including a first sprocket coupled to the rotating shaft. The offset chain guide member guides a chain between the first sprocket and a second sprocket that is coupled to both the offset chain guide member and a trenching mechanism that is disposed offset with respect to a trencher.