The Series 4 PTO Shaft is compatible with gearboxes featuring a 1-3/8" Z6 input shaft. It is equipped with a shear pin that protects the drive shaft from damage when subjected to excessive load. The PTO Shaft includes a quick-release splined yoke on the tractor side and comes with safety shields and chains. It measures 31" (790 mm) when compressed and can extend up to 38" (973 mm). This PTO shaft is compatible with all Woodland Mills wood chippers.