Swiveling utility machine having swivel deck

A swiveling utility machine includes a swivel deck (2), an engine (3) disposed at a rear portion of the swivel deck, a radiator (5) disposed adjacent the engine, a driver's seat (12), a right implement controller (15) disposed on the right side of the driver's seat and a left implement controller (14) disposed on the left side of the driver's seat. A support frame (4) is disposed at a rear portion of the swivel deck (2) in such a manner as to create a rectangular space inside the swivel deck, the engine (3) being mounted within the rectangular space. The driver' seat (12) is disposed upwardly of the support frame (4). The right implement controller (15) is secured to a right side of the support frame (4), and the left implement controller (14) is attached to a left side of the support frame (4) to be switchable in its posture between an operational posture and a retracted posture. An access step (45) is disposed at a front portion of the support frame (4), and an access entrance (20) is provided on a left side of the access step (45).