New item 04/20/17! Complete hydraulic pump coupler for mid-production 446 and early production 448 tractors. Fits 446 tractors s/n 9679230-14011823 and 448's prior to 14013893. Crankshaft half has a 1-1/8" 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.