Section 07: TRANSMISSION
PA1562
4
constant-mesh gearbox and an automated dry
clutch.
If the AS TRONIC transmission system is to be
used, the vehicle must have an electronic
engine control unit as well as CAN
communication. Since the clutch is automated
(clutch pedal no longer fitted), the driver no
longer has to activate the clutch.
FIGURE 3: ZF-ASTRONIC TRANSMISSION 07078
The actual shift procedure is performed by the
electronic transmission control unit. The driver
has the option of driving the vehicle in both
semi-automatic mode as well as fully
automatically. When in semi-automatic mode,
manual shifting with the range selector is made
easier.
When in fully automatic mode, gears are
selected and shifts made by the electronic
control unit. The driver can still intervene if he
wishes to. All system functions required are
shown on the display, e.g. neutral, gear change,
clutch overload and diagnosis information.
2. WELDING PROCEDURES
These procedures are intended only for vehicles
equipped with transmission electronic controls.
When frame or other welding is required on the
vehicle, precautions are to be taken to protect the
electronic control components. Refer to section
00: GENERAL INFORMATION, paragraph 3:
“Precautions to be observed before welding” for
complete procedure.
3. MAINTENANCE
3.1 ALLISON TRANSMISSION
To gain access to the dipstick, open the engine
compartment rear doors; dipstick is located on the
radiator side of the engine (Fig. 4).
3.1.1 Manual Fluid Level Check
DANGER
When checking the oil level, be sure that the
parking brake and/or emergency brakes are set
and properly engaged, and the wheels are
chocked. Unexpected and possible sudden
vehicle movement may occur if these
precautions are not taken.
o Special care must be taken not to touch the
engine coolant tubing and/or exhaust pipe,
since this could cause severe burns.
o Do not wear loose clothing and, stay away
from rotating parts during procedure;
personal injury could occur.
Clean all dirt from around the end of the oil filler
tube before removing the dipstick. Dirt or foreign
matter must not be permitted to enter the oil
system since it will cause valves to stick, undue
wear of transmission parts, and clogged
passages. Check the oil level using the
procedures in Cold Check and Hot Check.
Record any abnormal level on your "Maintenance
Records".
Always check the oil level reading at least twice
when the engine is running. Consistency is
important in maintaining the accuracy of the
reading. If inconsistent readings persist, check
the transmission breather to ensure it is clean and
free of debris.
FIGURE 4: OIL LEVEL DIPSTICK (AUTO. TRANS.) 07113
To Next Page
Loading...