Transmission shift systems
Transmission shift system safety precautions
Transmission shift system safety
precautions
Danger.
If it is necessary to disembark, even for a
short time, with the engine still running,
you must make sure that the transmission
is in position “N” (neutral), the parking
brake has been applied and the vehicle
has been secured by chocks. It is per-
missible to disembark with the engine still
running only if no passengers remain in
the passenger compartment and the bus
has been secured against unauthorised
access.
Operating the PSH (pneumatic shift
aid) transmission shift system
M26_00-0004-01
Changing gear
Note:
This transmission shift system works
purely mechanically. At approximately
90 mm, the shift throws are only half as
long as those of conventional shift sys-
tems. However, the time that is needed
for a gear change in the transmission
while synchronisation takes place is al-
most the same in physical terms. This
means that, to engage the next gear, the
driver has to move the shift lever handle
much more slowly, i.e. only half as fast
as before. Disengagement of a gear is
just as fast as normal. The best gear-
shifts are achieved by moving the gear
selector lever with gentle force and “wait-
ing” for the PSH gearshift. Nevertheless,
faster gear changes are possible in diffi-
cult situations.
Changing gear in the event of PSH
failure
Note:
PSH, the pneumatic shift aid, is designed
to improve shift comfort. Its pressure is
limited to 2.4 bar. If PSH fails, it is still
possible to select any of the gears while
the bus is in motion, but increased effort
will be required. The gearshift duration
(shift lever pressed to gear engaged) will
be longer because synchronisation will not
be as fast.
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