These gearbox forks engage and disengage the sliding gears within the transmission to select the desired forward or reverse speed. They are positioned inside the gearbox housing, where each fork rides on a selector rail and its prongs fit into the groove of the corresponding gear hub. A worn fork can cause incomplete gear engagement, leading to grinding, gear jump-out, or difficulty shifting. The original AGCO-manufactured part is machined to the same rail spacing and fork-prong thickness as the original assembly, so no adjustment or shimming is needed during installation. When reinstalling the gearbox cover, ensure the selector rails align with the fork bores and that the detent springs are seated correctly.