PART 7: STARTING & OPERATING THE VEHICLE PUTTING THE VEHICLE IN MOTION
(05/10) Y53-6032 – 101 –
CAUTION: Be careful not to apply the clutch
brake while the vehicle is moving. The pur-
pose of the clutch brake is to stop the trans-
mission so that you can shift into a starting
gear without grinding. Applying the clutch
brake when the vehicle is moving causes a
braking effect on the entire vehicle. This wear
naturally shortens the service life of your
clutch brake.
Double Clutching
Whether you are upshifting or down shifting, it is best to
double clutch. Double clutching is easier on your trans-
mission and on your engine, helping your vehicle match
engine speed with driveline speed and achieving clash-
free shifts. To double clutch:
1. Push down the clutch pedal to disengage the clutch.
2. Move the gear shift lever to neutral.
3. Release the pedal to engage the clutch. This lets you
control the RPM of the mainshaft gears. Thus you can
match the RPM of the mainshaft gears to those of the
output shaft.
• Upshifts - Let the engine and gears slowdown to
the RPM required for the next gear. Use the tachom-
eter to determine optimum RPM for gear engage-
ment.
• Downshifts - Press accelerator to increase engine
and gear speed to the RPM required in the lower
gear. Use the tachometer to determine optimum
RPM for gear engagement.
4. Now quickly press the pedal to disengage the clutch.
Move the gear shift lever to the next gear speed posi-
tion.
5. Release the pedal to engage the clutch.
Interaxle Differential
On vehicles with tandem rear axles, the interaxle differen-
tial allows each axle to turn independently. Differential
action between the tandems 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.
Y53-6032.book Page 101 Monday, May 24, 2010 3:37 PM
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