F43766 Clamp Upper Fits Case 1150B, 1150C, 1150D, 1150E, 1155D, 1155E model M60 KH 53AB5BDX150 This aftermarket replacement belt tensioner This aftermarket replacement belt tensioner is designed to maintain proper drive belt tension on Fits Case and Fits Case IH (Fits International Harvester) backhoe loader models equipped with Cummins diesel engines The outer valve spring works in conjunction with the inner valve spring (6I0284) to maintain proper valve seating and timing throughout the engine's operating range The companion lower side screen clamp is Fits Case part number F43767 The side screen clamps hold the protective mesh enclosures firmly in place