[77newell]

The HCV is the Height Control Valve that controls air pressure in the air bags of the suspension system in order to maintain a fixed ride height of the coach regardless of changes in load while the coach is moving. The valve body is solidly mounted to the frame rail and has a 12" or lever coming off it more or less horizontally in a fore-and aft orientation. Towards the end of the lever there is a connection to a vertical rod and the other of that rod is connected to the small bracket welded to the axle. If you add load to the coach it tends to depress the air bags so the frame rail moves the valve down slightly which causes the lever to tilt upwards which causes the valve to add air to the air bags until the lever is once more horizontal and the air shuts off. When the load in the coach is reduced the opposite happens.