04678300 – Ariens® / Gravely® PTO Clutch, 105 ft-lb Monopole, 6.83" (Genuine OEM Part)04678300 Ariens Gravely PTO Clutch, 105 ft lb Monopole, 6. 83" (Genuine OEM Part) The 04678300 PTO clutch is a genuine OEM replacement designed for use on select Ariens and Gravely zero turn mowers. This 105 ft lb monopole clutch features a 6. 83 inch diameter and is engineered to deliver reliable engagement and consistent power transfer from the engine to the mower deck. Manufactured to original equipment specifications, this clutch ensures proper