Driver Controls Interaxle Lock Switch The interaxle lock switch allows the driver to lock the drive axles together, causing the drive axle shafts to rotate together. See Fig. 4.12 . Use this feature only under adverse road conditions where greater traction is needed. LIFT AXLE 08/22/2011 f545817 Fig. 4.13, Lift Axle Switch Cruise Control Switches NOTE: See Chapter 10 for detailed information about cruise control operation. 07/22/2011 f545802 On/Off Switch Fig. 4.12, Interaxle Lock Switch Press the upper half of the cruise control on/off switch to activate it. See Fig. 4.14 . Leave the control in the UNLOCK position for normal highway operation.
When a spinning or slipping ac- tion occurs at any of the drive wheels, press the upper half of the switch to LOCK the differential and prevent the wheels from spinning. NOTICE CRUISE CONTROL SET/DECEL Do not shift into LOCK while the rear wheels are spinning. Come to a halt before engaging to pre- vent damage to the interaxle and main differen- tials. RES/ACCEL Do not permit rear wheels to spin freely for more than ten seconds when traction is lost. Shift into LOCK to prevent damage to the interaxle and main differentials. 07/15/2011 f545790 1. Cruise Control On/Off Switch 2. Cruise Control Set/Resume Switch Lift Axle Switch Fig.
4.14, Cruise Control Switches The lift axle switch controls the lift axle operation. See Fig. 4.13 . Pushing the upper half of the switch will lower the lift axle. NOTE: Cruise control is canceled if the brake or clutch pedal is depressed, or engine speed drops below 1200 rpm. 4.7