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 engine in that gear, and speed must be sufficient so that
engine will not labor or jerk when the next highest gear
is reached. In practice, with a loaded unit, the engine
must be brought close to maximum engine speed in each
gear before shifting into next higher gear. To shift into
next higher gear, use the following steps:
(1) Push down o n c l u t c h p e d a l a n d r e l e a s e
accelerator.
D i s e n g a g e clutch slightly ahead of
releasing accelerator.
(2) While engine speed is dropping, move gearshift
lever to neutral.
(3) Release clutch pedal to engage clutch.
(4) Quickly disengage clutch by pushing pedal down
and move gearshift lever to next higher gear.
(5) Release clutch pedal and speed up engine at the
same time.
The above procedure is known as
double-clutching
must be
used on
most
and
manually-shifted
truck
transmissions.
On trucks
equipped with synchro-mesh transmissions, shifting is
faster and smoother when they are double-clutched.
Never risk clashing gears by attempting
to force transmission into next gear. If
transmission cannot be shifted smoothly
due to improper timing in double-clutch-
ing, stop in a safe place and start over.
(6) Continue shifting up through the gears until the
permissible road speed is reached.
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