This thrust washer sits inside the gearbox housing, positioned between a rotating gear face and a stationary case surface. It maintains the correct axial clearance for the gear cluster, preventing metal-to-metal contact during load shifts. A worn washer allows end-play to increase, which produces a distinct rattle in neutral and can lead to chipped gear teeth under heavy drawbar load. The washer is manufactured by AGCO to match the original stack height, so no additional shimming is required when installed. On reassembly, ensure the washer face is clean and oriented correctly, and verify the end-play after torquing the bearing retainer.