5-21
ROUTINE OPERATIONROUTINE OPERATION
Wheel Differential Lock
A Blue Bird bus may be equipped with an optional, driver controlled, Wheel Differential Lock System. The driver manually locks and unlocks
the wheel differential using a cab mounted control switch. When the control switch is placed in the lock position, an air supply solenoid valve
opens and air pressure activates the shift unit to engage the differential lock. When the control switch is placed in the unlock position, air
pressure supply is shut off and air pressure is released from the shift unit to disengage the differential lock.
WARNING! WARNING! Engage the wheel differential lock ONLY when the vehicle is stationary or moving without wheel
differentiation (spinout).
WARNING! WARNING! Do NOT use the wheel differential lock when traveling downhill.
WARNING! WARNING! Do NOT use the wheel differential lock at speeds over 25 MPH.
WARNING! WARNING! When the wheel differential lock is engaged, be sure to allow for a larger turning radius and greater
steering effort.
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