This cab suspension shock absorber dampens vertical oscillations transmitted from the chassis to the operator station. It is installed between the axle assembly and the cab mounting frame, where it controls the rate of compression and rebound during travel over uneven ground. A worn unit allows excessive cab movement, which increases operator fatigue and can cause contact between the cab and the chassis at full suspension stroke. This component is manufactured to the original spring and damping rate specifications, so the cab returns to its correct ride height and the suspension cycle timing matches the rest of the system.