The Caterpillar 3044 and 3044C (also designated Cat C3.4) is a 3.3–3.4 litre, 4-cylinder industrial diesel engine used across Caterpillars compact skid steer loader, multi terrain loader, compact track loader, wheel loader, aerial lift and industrial sweeper product lines. It is one of the most widely used compact Caterpillar engines, found in both B-series and C-series machines from approximately 2002 onwards.