PURPOSE: To minimize, the turning radius as possible, and to increase the loadage of a lorry by inclining forth at a certain angle, the pipe connecting respective adjacent cylinders to each other.

CONSTITUTION: A connecting pipe 10A is inclined forth at a certain angle θ with respect to the axis of a discharge screw 9, whereby attaining the shorter turning radius R2 measured from the center of a vertical screw 8 to that of a hydraulic motor 14 in comparison with the turning radius R1 used in the ordinary lorries. The capacity of a partially cut-out part 3a is therefore reduced so that the loadage of the lorry may be increased.