A coarse particle separator (100; 100') for highly viscous fluids, comprising at the least: - a housing (10; 10'; 210) having at least one inlet channel and at least one outlet channel and at least one inner receiving space (13; 13.1', 13.2'; 213), - at least one filter drum (30; 230) which has a plurality of filter openings (32; 232) on its outer casing and which is disposed inside the at least one receiving space (13; 13.1', 13.2'; 213) in the housing (10; 10'; 210), - at least one scraper element (20; 20'; 220) arranged axially displaceably inside the filter drum (30; 230) and guided with at least one scraper blade (22; 222) over the filter openings (32; 232) on the inner side of the filter drum (30; 230), characterized in that a cover element having an inner sealing zone which is surrounded by an annular portion (41; 241; 241') and which can be coupled with an inner sealing zone on the scraper element (20; 20'; 220) is provided on an end region of the filter drum (30; 230) or on an end face of the receiving space (13; 13.1', 13.2'; 213) in the housing (10; 10'; 210); - and in that the scraper element (20; 20'; 220) can be moved over and beyond the filter openings (32; 232) in the filter drum (30; 230) into an axial end position, in which a seal for an outer annular chamber (15; 215) is produced between - a) the scraper blade (22; 222) and the inner wall of the filter drum (30; 230) and/or the inner circumference of the inner receiving space (13; 13.1', 13.2'; 213) and - b) between the inner sealing zones on the cover element (40; 240; 240') and on the scraper element (20; 20'; 220) and said outer annular chamber (15; 215) is separated from the rest of the receiving space, wherein at least one dirt discharge channel (18; 218) leads from the annular chamber (15; 215) to the outside of the housing (10, 210). - a housing (10; 10'; 210) having at least one inlet channel and at least one outlet channel and at least one inner receiving space (13; 13.1', 13.2'; 213), - at least one filter drum (30; 230) which has a plurality of filter openings (32; 232) on its outer casing and which is disposed inside the at least one receiving space (13; 13.1', 13.2'; 213) in the housing (10; 10'; 210), - at least one scraper element (20; 20'; 220) arranged axially displaceably inside the filter drum (30; 230) and guided with at least one scraper blade (22; 222) over the filter openings (32; 232) on the inner side of the filter drum (30; 230), - and in that the scraper element (20; 20'; 220) can be moved over and beyond the filter openings (32; 232) in the filter drum (30; 230) into an axial end position, in which a seal for an outer annular chamber (15; 215) is produced between - a) the scraper blade (22; 222) and the inner wall of the filter drum (30; 230) and/or the inner circumference of the inner receiving space (13; 13.1', 13.2'; 213) and - b) between the inner sealing zones on the cover element (40; 240; 240') and on the scraper element (20; 20'; 220) and said outer annular chamber (15; 215) is separated from the rest of the receiving space, wherein at least one dirt discharge channel (18; 218) leads from the annular chamber (15; 215) to the outside of the housing (10, 210). - a) the scraper blade (22; 222) and the inner wall of the filter drum (30; 230) and/or the inner circumference of the inner receiving space (13; 13.1', 13.2'; 213) and - b) between the inner sealing zones on the cover element (40; 240; 240') and on the scraper element (20; 20'; 220)