Medium Duty Operator's Manual - Peterbilt Motors Company

DASH- AND DOOR-MOUNTED FEATURES
WARNING! Placing the differential lock in the
“LOCK” position while your wheels are spinning
could cause loss of control or axle damage.
You could be hurt. Switch to “LOCK”
only when your wheels are not spinning.
See “Interaxle Differential” on page 95 for more information
on using your interaxle differential.
Two-Speed Rear Axle (Range) Switch
CONTROLS AND DISPLAY
For information on how to operate your two-speed rear
axle properly and safely, see “Dual Range (Two Speed)
Axles” on page 97.
Fifth Wheel Lock (Slider Adjustment) Switch
.
.
FIFTH WHEEL
RANGE SELECTOR
If your vehicle is equipped with a two-speed rear axle, you
can select the axle range by the dash mounted switch
shown above. The low range provides maximum torque
for operating off-highway. The high range is a faster ratio
for highway speeds.
WARNING! Do not move the fifth wheel while
the tractor-trailer is in motion. Movement of
the fifth wheel while a tractor-trailer is moving
can cause a serious accident. Your load could
shift suddenly, causing you to lose control of
the vehicle. Never operate the vehicle with the
switch in the unlock position. Always inspect
the fifth wheel after you lock the switch to be
sure the fifth wheel is engaged.
– 60 – Y53-6008A Medium Duty (R05/09)