Earth working machine having a dust extraction system with selectable filtration of the extracted dust-laden air

A self-propelled earth working machine, comprising:

• a plurality of ground engaging units;
• a machine frame height adjustably supported from the ground engaging units;
• a working apparatus supported from the machine frame and configured to remove material from a region of a substrate;
• and
• an extraction device configured to extract dust-laden air generated by the working apparatus from at least one extraction location, and to exhaust extracted air at a discharge location different from the extraction location, the extraction device including a filter apparatus arranged along an operational flow path from the at least one extraction location to the discharge location, the filter apparatus including:
• a filter housing;
• a filter element received in the filter housing, the filter element being configured to remove dust particles from the air flowing through the filter apparatus;
• a bypass valve shiftable between a filtering operating position and a bypass operating position, the bypass valve including a filter-housing-mounted valve component mounted on the filter housing and a movable valve component movable relative to the filter housing;
• wherein in the filtering operating position the bypass valve connects the at least one extraction location to the discharge location through the filter element;
• wherein in the bypass operating position the bypass valve connects the at least one extraction location to the discharge location while bypassing the filter element;
• wherein the filter housing includes a first compartment, the filter element being received in the first compartment;
• and
• wherein the filter-housing-mounted valve component includes first and second entry openings, the first entry opening being communicated with the first compartment.

A self-propelled earth working machine, comprising:

• a plurality of ground engaging units;
• a machine frame height adjustably supported from the ground engaging units;
• a working apparatus supported from the machine frame and configured to remove material from a region of a substrate;
• and
• an extraction device configured to extract dust-laden air generated by the working apparatus from at least one extraction location, and to exhaust extracted air at a discharge location different from the extraction location, the extraction device including a filter apparatus arranged along an operational flow path from the at least one extraction location to the discharge location, the filter apparatus including:
• a filter housing;
• a filter element received in the filter housing, the filter element being configured to remove dust particles from the air flowing through the filter apparatus;
• a bypass valve shiftable between a filtering operating position and a bypass operating position, the bypass valve including a filter-housing-mounted valve component mounted on the filter housing and a movable valve component movable relative to the filter housing;
• wherein in the filtering operating position the bypass valve connects the at least one extraction location to the discharge location through the filter element;
• wherein in the bypass operating position the bypass valve connects the at least one extraction location to the discharge location while bypassing the filter element;
• and
• wherein the bypass valve further includes a valve drive system configured to shift the bypass valve between the filtering operating position and the bypass operating position upon actuation of a control switch on an operator's platform of the earth working machine.