Machine description: Mack EM7 6 Cylinder Diesel 250 hp Engine, 1994 US EPA Label, 37423 Engine hrs, 5-Speed Manual Transmission, 11R24.5, Air Ride Suspension, 162 in Wheelbase, PTO, 2000 gal Steel Tank, PTO Driven Pump, R... more info about the 1994 Mack CH612.