TM 9-2330-373-14 & P
11-13. AIR SUSPENSION SYSTEM (cont)
Loss of air pressure or air spring deflection by off center loading causes actuating arm to move up.
Up movement of actuating arm opens the intake valve and allows supply air to pass through to the air springs serviced by
Down movement of actuating arm opens the exhaust valve, allowing excess air pressure to vent to the atmosphere.
A check valve in the intake fitting prevents pressure loss if high pressure air supply is interrupted.
The height control valve incorporates a five-second time delay to prevent unnecessary actuation while the vehicle is
traveling on uneven terrain at operating speeds.
A 3/8-inch dead zone is built into the valve action to prevent a valve hunting action.
When the semitrailer is uncoupled from the towing vehicle, the air springs automatically exhaust air until the bolster plate
comes to rest on rubber bumpers inside the air springs.
1-14. AIR MOUNTED FIFTH WHEEL KINGPIN SYSTEM