Interaxle Differential Lockout Control
Valve Switch
CAUTION
The interaxle lock should only be engaged when
the vehicle is moving slowly at low throttle. En-
gagement at high speed or power can damage
the axle(s).
The interaxle lock, standard on all dual-drive ve-
hicles, is driver-actuated by means of a LOCK/
UNLOCK control valve switch mounted on the control
panel. See Fig. 2.35. A red indicator light comes on
whenever the interaxle differential is locked out
(switch is in the lock position; no differential action
between the drive axles). A guard around the switch
minimizes accidental activation.
Fifth Wheel Air Slide Control Valve
Switch, Optional Air-Operated Sliding
Fifth Wheel
The fifth wheel air slide valve permits repositioning of
the sliding fifth wheel from inside the cab. Moving the
air slide control valve switch to the lock position de-
activates the control valve and locks the fifth wheel
to the baseplate. See Fig. 2.36. 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 varying state or
provincial laws. A red indicator light, if so equipped,
is illuminated whenever the fifth wheel slide is un-
locked. A guard is positioned around the switch to
minimize accidental activation.
CAUTION
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.
Air Suspension Dump Valve, Optional
The air suspension dump valve allows the air in the
vehicle air suspension to be quickly exhausted, low-
ering the rear of the vehicle. This makes it easier to
connect to or disconnect from a trailer. To exhaust air
from the suspension, move the switch to LOWER.
When the switch is moved back to the normal posi-
tion, the suspension will return to the correct ride
height. A guard is positioned around the switch to
minimize accidental activation. See Fig. 2.37.
09/26/95
f350141
Fig. 2.35, Interaxle Differential Lockout Switch
9/07/95 f310489
Fig. 2.36, Fifth Wheel Air Slide Switch
09/26/95
f350143
Fig. 2.37, Air Suspension Dump Valve
Instruments and Controls Identification
2.29
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