New item 07/22/17! Complete hydraulic pump coupler for mid-production 224 and 444 tractors. Fits 224 tractors s/n 9676545-14007910 and 444 tractors s/n 9677752-14009355. Crankshaft half has a 1" bore and the pump half is 9/16". We recommend always measuring the pump input shaft before ordering as the tractor may have been updated with a newer 1/2" input shaft pump during a previous repair.