A locking mechanism for a bucket of the type having a main body defining a cavity and an opening configured for unloading a content of the bucket from the cavity and a door pivotally mounted on the main body, the door movable between a closed position in which the opening is substantially closed by the door and an opened position in which the content may exit the bucket via the opening. The locking mechanism may include a locking mechanism having a latch bar engaged by a lever bar, the lever bar in abutment against a fulcrum, the lever bar movable between a locked position in which the latch bar locks the door in the closed position by engagement with at least one abutment surface on the main body, and an unlocked position in which the latch bar is disengaged from at least one abutment surface to allow movement of the door from the closed position to the opened position. An adjusting mechanism may be operable to move the fulcrum relative to the door to vary an overlap of the latch bar with the at least one abutment surface.