A hydraulic pump comprising: a housing; a cylinder block disposed for rotational movement within the housing and including a plurality of piston chambers, wherein the cylinder block rotates about a cylinder block rotational axis; a plurality of pistons, each piston being received in a respective piston chamber; a swash plate disposed for pivotal movement in the housing and cooperating with the pistons to vary a working volume of the piston chambers, the swash plate being pivotal about a pivot axis; wherein the hydraulic pump further comprises a return to neutral ("RTN") mechanism, comprising: - a trunnion arm including a cylindrical shaft portion and a cam portion connected with or integrally formed with the shaft portion, the trunnion arm being operatively connected with the swash plate for controlling pivotal movement of the swash plate, the cylindrical shaft portion defines a trunnion arm rotational axis that is parallel to and offset from the pivot axis, the cam portion being disposed within the housing; the hydraulic pump characterized by the cam portion including a first lateral cam surface and a second lateral cam surface disposed on an opposite side of a cam portion axis that extends through the cam portion, intersects the trunnion arm rotational axis and is perpendicular to the trunnion arm rotational axis; - a first biasing assembly disposed in the housing and cooperating with the first lateral cam surface to urge the cam portion in a first direction toward a neutral position; and - a second biasing assembly disposed in the housing and cooperating with the second lateral cam surface to urge the cam portion in a second direction toward the neutral position, wherein the second direction is opposite the first direction. a housing; a cylinder block disposed for rotational movement within the housing and including a plurality of piston chambers, wherein the cylinder block rotates about a cylinder block rotational axis; a plurality of pistons, each piston being received in a respective piston chamber; a swash plate disposed for pivotal movement in the housing and cooperating with the pistons to vary a working volume of the piston chambers, the swash plate being pivotal about a pivot axis; wherein the hydraulic pump further comprises a return to neutral ("RTN") mechanism, comprising: - a trunnion arm including a cylindrical shaft portion and a cam portion connected with or integrally formed with the shaft portion, the trunnion arm being operatively connected with the swash plate for controlling pivotal movement of the swash plate, the cylindrical shaft portion defines a trunnion arm rotational axis that is parallel to and offset from the pivot axis, the cam portion being disposed within the housing; the hydraulic pump characterized by the cam portion including a first lateral cam surface and a second lateral cam surface disposed on an opposite side of a cam portion axis that extends through the cam portion, intersects the trunnion arm rotational axis and is perpendicular to the trunnion arm rotational axis; - a first biasing assembly disposed in the housing and cooperating with the first lateral cam surface to urge the cam portion in a first direction toward a neutral position; and - a second biasing assembly disposed in the housing and cooperating with the second lateral cam surface to urge the cam portion in a second direction toward the neutral position, wherein the second direction is opposite the first direction. - a trunnion arm including a cylindrical shaft portion and a cam portion connected with or integrally formed with the shaft portion, the trunnion arm being operatively connected with the swash plate for controlling pivotal movement of the swash plate, the cylindrical shaft portion defines a trunnion arm rotational axis that is parallel to and offset from the pivot axis, the cam portion being disposed within the housing; the hydraulic pump characterized by the cam portion including a first lateral cam surface and a second lateral cam surface disposed on an opposite side of a cam portion axis that extends through the cam portion, intersects the trunnion arm rotational axis and is perpendicular to the trunnion arm rotational axis; - a first biasing assembly disposed in the housing and cooperating with the first lateral cam surface to urge the cam portion in a first direction toward a neutral position; and - a second biasing assembly disposed in the housing and cooperating with the second lateral cam surface to urge the cam portion in a second direction toward the neutral position, wherein the second direction is opposite the first direction.