Abstract: An auxiliary apparatus with a trough or tank, to which the incineration residues are supplied by means of a drop shaft, a movable piston for moving the incineration residues from the trough to a discharge chute and at least one opening for inspecting and maintaining the trough arranged in a side wall at the latter and provided with a door. A plate, which can be inserted through the opening in the trough, is positioned in front of the front face of the piston. The plate is held on the chute walls by locking devices and is supported on the piston by adjusting mechanisms. The front face of the plate assembled from two parts is, for the same width, twice as high as the front face of the piston. The adjusting mechanisms are constructed as an adjustable arrangement of push rods or as pneumatic or hydraulic lift cylinders.