SHIFT AT ANY SPEED EXCEPT
IF A WHEEL IS SPINNING
03029
PUTTING THE VEHICLE IN MOTION PART 7: STARTING & OPERATING THE VEHICLE
– 82 – Y53-6007 (R10/06)
Switch In Unlock Position
In the LOCK position, continuous operation on a paved,
dry surface stresses the tandem axles, possibly causing
internal damage to them.
• Shift into the LOCK position to operate on slippery
surfaces like
– Ice or snow - with or without tire chains
– Dirt roads
– Loose sand, mud, or other off-road conditions
• Switch into LOCK when checking performance on a
chassis dynamometer.
WARNING!
• Do not put the differential lock in the LOCK
position while the wheels are spinning
freely (slipping), you could lose control of
the vehicle or cause axle damage—you
could be injured. Switch to LOCK only when
the wheels are not spinning.
• Do not operate the vehicle on dry pavement
with the differential locked; it could lead to
an injury accident. On dry pavement, you
will not be able to steer well with the differ
-
ential locked. Lock the differential only
when operating on surfaces with poor trac
-
tion, such as wet, slippery roads or loose
gravel.
• Do not use the differential lock during
downhill operation or at speeds above 25
mph (40 km/h). When it is engaged under
these conditions, your vehicle will exhibit
“understeer” handling characteristics. This
“understeer” condition will cause your
vehicle to not turn as quickly and more
steering effort will be required, which can
cause an injury accident.
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