Driver Controls WARNING sion will not absorb road shocks and compo- nents may be damaged. To lower the rear of the vehicle, press the upper half of the rocker momentarily. To raise the suspension to its normal height, press the lower half of the switch. Make sure that the control lever is back in the neutral position and the steering column is locked before driving the vehicle. Never tilt the column while driving the vehicle. Doing so could cause loss of vehicle control, personal injury, and property damage.
Fifth Wheel Slide Control Switch Suspension/Trailer Connection Controls Air-Suspension Dump Control Switch NOTICE Do not activate the fifth wheel slide control valve while the vehicle is in motion. To do so could cause damage to the fifth wheel member, the kingpin, the cab or trailer, and ultimately to the drivetrain. NOTICE The fifth wheel air slide switch permits repositioning of the sliding fifth wheel from inside the cab. See Fig. 4.27 . Moving the air slide control valve switch to the lock position deactivates the control valve and locks the fifth wheel to the baseplate.
Moving the switch to the unlock position activates the control valve and unlocks the fifth wheel slide mechanism, allowing changes to the total length of the tractor- trailer and changes to axle loads to comply with vary- ing jurisdictional laws. For detailed operating instruc- tions for fifth wheel slide, coupling, and uncoupling procedures, refer to Chapter 17 . Do not operate the vehicle over uneven ground such as ramps, speed bumps, curbs, etc., with the air springs deflated. Doing this may lead to air bag separation from the piston, preventing the suspension air springs from inflating.
The suspension dump switch allows the air in the air suspension to be quickly exhausted, lowering the rear of the vehicle. Fig. 4.26 . This makes it easier to connect to, or disconnect from, a trailer. 07/22/2011 f545805 07/22/2011 f545806 Fig. 4.26, Air-Suspension Dump Switch Fig. 4.27, Fifth Wheel Slide Control Switch NOTICE Climate Controls Never exhaust air from the suspension while driving. When the air is exhausted, the suspen- NOTE: See Chapter 5 for detailed climate con- trol panel operating instructions. 4.13