Compact track loader with lockable suspension system

A suspension assembly of a work machine being movable in a forward direction. The work machine includes a frame, an undercarriage supporting the frame and at least one ground-engaging track. The suspension assembly includes a torsion assembly having an axle, a torsion bar adapted to be fixedly coupled to the frame, and an axle arm coupled at one end to the axle and at an opposite end thereof to the torsion bar. A locking arm has a first end and a second end, where the first end is coupled to the axle arm. A hydraulic actuator is coupled to the second end of the locking arm. The hydraulic actuator is operably controlled between a locked configuration and an unlocked configuration. In the unlocked configuration, the axle arm is pivotable relative to the frame, and in the locked configuration the axle arm is restricted from pivoting relative to the frame.