PART 7: STARTING & OPERATING THE VEHICLE
PB1319 (CAT. NO. 5296 ) —70— 22-01691 (R02/02)
4. Now quickly press the pedal to disengage the clutch. Move the
gear shift lever to the next gear speed position.
5. Release the pedal to engage the clutch.
Interaxle Differential
On vehicles with tandem rear axles, the interaxle differential allows
each axle to turn independently. Differential action between the tan-
dems relieves stress on the rear axles and tires and provides better
performance. When operating normally on paved, dry surfaces, keep
your truck’s interaxle differential in the UNLOCK position.
In the LOCK position,
an air operated clutch positively locks both sets of
axles together, providing greater traction on slippery road surfaces; how-
ever, steering around corners and on dry pavement is more difficult.
Con-
tinuous 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 dyna-
mometer.
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 dam-
age—you could be injured. Switch to LOCK only when the
wheels are not spinning.
WARNING! Do not operate the vehicle on dry pavement
with the differential locked; it could lead to an injury acci-
dent. On dry pavement, you will not be able to steer well
with the differential locked. Lock the differential only when
operating on surfaces with poor traction, such as wet, slip-
pery roads or loose gravel.
SHIFT AT ANY SPEED EXCEPT
IF A WHEEL IS SPINNING
03029
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