Drum Drive Version Operating Weight : 11.3 Tonnes Engine : Ashok Leyland ALHT4CTIC3-BSIII . 101 HP @ 2200 rpm, four cylinder water cooled Frequency : 34 Htz ( High ) 31 Htz ( Low ) Amplitude : 0.9 mm 1.8 mm Drum Width : 2100 mm Gradeability : 40% Optional : Compaction Meter