PTO Shaft to New Holland BigBaler Square Balers 335 360 New Holland Bigbaler models for Square Balers 335, 340 Our research has shown that the majority of tractor designs employ 1.375-21 Splines. The input shaft has 1.750-6 Splines. Other combinations are also available. PTO Shaft Assembly PTO Catagory / Tractor Part Number CAT5/540 1.375-6 CS8R121U2WR7000 CAT5/1000 1.375-21 CS8R121U2WR8000 CAT5/1000 1.375-20 CH8R121U2WR0000 PTO Shaft Yokes Part Number Diameter No of Splines Bore c-e Length Notes 5090L0360 1.375 6 68 133 Splined 5090L3760 1.375 21 68 133 Splined 5090L0460 1.750 6 68 133 Splined 5090L3860 1.750 20 68 133 Splined The PTO Shaft is what it's called. A PTO shaft transmits power of an engine to an PTO shaft driven attachment. This allows the tractor to run a range of tractor equipments, such as flail mowers, wooden chippers excavators, rotary tillers and many more. PTO shaft connections on tractor aren't standard, and can lead to issues with joining with the PTO shaft. For instance, some older models have the connection flange located closer to the tractor making it difficult to connect, creating a danger to safety.