AIR SUSPENSIONS AND HWH - HWH Corporation

When the tag control switch is returned to the travel position, the tag dump valves are turned off and thetag travel or tag enable valves are turned on. If the tag air manifold controls a tag lift mechanism, the taglift valve is turned off and the tag lift dump valve is turned on.3-7 Schematic representations of air manifold functions. The basic operation of the air manifold and itscomponents was discussed section 3-2.3, but we now will look at some schematics of several differentmanifolds to show you how the air flows through the manifolds to perform travel, leveling and tag liftfunctions. The following schematics will be drawn with the valves or pressure switches open or closed asthey would be for the function that is being performed. It is important to remember when viewingschematics in a normal manner, the components will be drawn in the normal off position. With the airleveling valves and switches, this would be with the valves closed and the pressure switch contacts closed.Remember that there are many variations of plumbing, air manifold and tag axle arrangements. Thefollowing schematics are EXAMPLES of possible arrangements. You should contact the vehiclemanufacturer or HWH Corporation for specific plumbing and air manifold arrangements for thevehicle that you are dealing with.3-7.1 Travel mode schematic. The following schematics show the manifold valves in the travel mode;one has a standard tag axle manifold with no tag lift valves and one with no tag axle. Note only the travelvalves are open. The air can flow through the manifold to and from the height control valves. The heightcontrol valves maintain the proper travel height. All pressure switch contacts should be open at this time.Page 27 – 22JUL09