Operator`s manual

OPERATION
390
The differential lock should be used on icy or slippery surfaces. As
soon as the slippery surface has been passed, the differential lock
should be disengaged.
Differential locks must not, under any circumstances, be engaged
when in a wheel-spin situation. Engage the locks ahead of the slippery
area. If already slipping, stop the wheels, engage the locks and then
continue. If the differential locks are engaged when the wheels are
spinning, the differential will be damaged and the rear axle drive unit
could possibly fail.
All efforts must be made to avoid spinning the wheels at high speeds
on slippery surfaces. This is true whether the differential locks are
engaged or not. Excessive wheel spin may result in failure of the
cluster gears and other components found within the rear axle
housing(s). If you are unable to obtain traction, engage the differential
locks as described below. If you are still unable to move the truck, seek
assistance from a qualified tow operator.
Engaging the differential locks must always be done as follows (see
“Pre-Trip Inspection Quick List” on page 221 for switch location):
1. Depress the clutch pedal. Wait for the drive wheels to stop
spinning.
2. Engage the differential lock.
3. Engage a suitable gear.
4. Carefully release the clutch pedal.
vn-vhd.bk Page 390 Tuesday, July 1, 2008 9:44 AM