OPERATION
5-50 / Driving the Vehicle
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5-28.3 Dana Drive Axle Wheel Differential Lock (Optional)
To engage:
1. Flip the control lever to the LOCK position, either while the vehicle is stationary, or while moving at a steady
speed under 25 mph without the wheels slipping (spin out).
2. Let up momentarily on the accelerator pedal to relieve torque on the gearing and fully engage the clutch.
3. When the differential lock is engaged, the indicator light will be ON, or an audible signal will sound.
4. When the differential lock is engaged, the vehicle will understeer, requiring a longer turning radius for a given
turn.
To disengage:
1. To disengage the Wheel Differential Lock, flip the control lever to UNLOCK.
2. Let up momentarily on the accelerator pedal to relieve torque and allow the clutch to disengage.
3. When the differential lock is disengaged, the indicator light and/or audible signal will go out.
5-28.4 Inter Axle Differential (IAD) Lock (Tandem Axles)
The inter-axle differential provides for necessary differential action between the axles of a tandem drive unit. This
allows the wheels of either axle to revolve faster or slower than the wheels of the other axle in order to compensate
for cornering, uneven road surfaces, and slightly different tire sizes. When encountering soft or slippery road
conditions, the IAD can be locked out, eliminating any differential action between the axles.
Lock the inter-axle differential and achieve maximum pulling power when approaching slippery or poor road
conditions.
After engaging the IAD Lock switch and proceeding at a slow, even speed, let up momentarily on the accelerator
pedal to allow the lock to engage. Proceed over the poor road conditions cautiously.
Once road conditions have improved, move the IAD Lock switch to the UNLOCK position while maintaining vehicle
speed. Let up momentarily on the accelerator to allow the lock to disengage. Resume driving at normal speed.
Engage Wheel Differential Lock ONLY when vehicle is stationary, or moving without wheel slippage.
Lock the Inter Axle Differential only when stopped or moving at a slow speed. Never attempt to lock the
Inter Axle Differential while the rear wheels are spinning as this may cause shock damage to the axle
components and result in costly repairs.
Never shift a two-speed tandem axle from one range to another with the IAD in the LOCKED position.
This may cause shock damage to axle components and result in costly repairs.
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