本规范涵盖的转向装置旨在用作装甲作战推土机M9 ACE的转向装置。转向装置是一个双速双输出变速箱，用于手动控制履带车辆，包括锥齿轮组、离合器制动和齿轮转向系统以及整车制动器。

The steer unit covered by this specification is intended for use as a steer unit for the Armored Combat Earthmover M9 ACE. The steer unit is a two-speed, double-output gearbox, manually controlled for manipulating track laying vehicles, and includes a bevel gear set, clutch brake and geared steering systems, and full vehicle brakes.