Auxiliary Transmission; More Transmission Tips - Peterbilt 348 2017 Operator's Manual

Auxiliary Transmission

If you have an auxiliary transmission,
see your transmission manufacturer's
manual for its proper operation.
(03/17)

More Transmission Tips

Riding the Clutch
The clutch is not a footrest. Do not
drive with your foot resting on the
clutch pedal. It will allow your clutch to
slip, causing excessive heat and wear,
damage could result.
Release Bearing Wear
When you must idle your engine for any
period of time, shift your transmission
to neutral and disengage the clutch
(take your foot OFF of the pedal). This
helps prevent unnecessary wear to
your clutch release bearing, and it is
less tiring for you, too.
Tips
•
Always use the clutch when
making upshifts or downshifts.
•
Always select a starting gear
that will provide sufficient gear
reduction for the load and terrain.
Y53-6060-1C1
OPERATING THE TRANSMISSION
•
Never downshift when the vehicle
is moving too fast.
•
Never slam or jerk the shift lever
to complete gear engagement.
•
Never coast with the transmission
in neutral and the clutch
disengaged.
•
To provide smooth gear
engagements while shifting,
use proper coordination between
shift lever and clutch.
Double clutching is a very effective
means to increase the service life of
your transmission. Double clutching
refers to a technique where the clutch
pedal is used twice per shift instead of
once. It also requires that you adjust
the engine rpm in the middle of the
shift which ultimately synchronizes the
gears during shifting. Synchronizing
reduces wear on the gears.
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