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Case Construction Equipment has upgraded its four largest Alpha Series skid steers and compact track loaders, which now meet emission requirements for Tier 4 Interim certification. The Case SR250 and SV300 skid steers and TR320 and TV380 compact track loaders now feature 90-hp (67-kW), 3.4-liter Case diesel engines with the full high-pressure common rail (HPCR) design typically used in larger construction equipment. To meet Tier 4Interim emission requirements, Case equipped the models with cooled exhaust gas recirculation (CEGR) technology, including diesel particulate filter and diesel oxidizing catalyst. Case selected CEGR technology as most appropriate for skid steers and compact track loader applications, where the engine typically runs at a high RPM.