Controls and Operating
3-42
Allison Series 4500 Automatic Shift Transmission
The Allison Series 4500 transmission is equipped with an electronic
control unit (ECU) which continually monitors the transmission and shift
system electrical components and warns the operator when a problem
develops. It also takes action to prevent damage to the transmission, and
provides the serviceman with diagnostic capabilities so that problems can
be corrected quickly and easily.
When a fault occurs, a two digit error code will be displayed on the LCD
display on the dash panel. The error code is also recorded in the
transmission ECU, and can be accessible by the serviceman by plugging
in a data reader to extract information relating to the fault. The error code
recorded in the ECU memory will remain until it is erased by a technician.
If a major fault is detected, it is the operator’s responsibility to shut down
the machine as soon as it is safe to do so. The machine should not be
restarted until the fault has been diagnosed and corrected.
Refer to 'Allison4th GEN Diagnostic Codes' table for a list of fault codes
and possible cause on Section 3.
The Series 4500 transmission with 4th GEN control has been designed to
provide the driver with maximum operational flexibility, by allowing the
choice of automatic or manual gear selection to optimize vehicle
performance under all operating conditions.
The transmission provides six forward gears, one reverse gear and a
neutral position. The gear positions are indicated by the LCD display on
the gearshift lever and on the DISPLAY screen. When the lever is in the
automatic range, shifts will occur automatically between 1st and 6th gear,
depending on operating requirements.
NOTICE: Before any welding
is done on a machine
equipped with 4th GEN con-
trol shift system, disconnect
the following in this order:
battery earth cable, battery
supply cable, alternator earth
cables, alternator supply
cables and electrical connec-
tions at the engine EMS,
transmission ECU, hydraulic
ECU, DISPLAY ECU and cab
bulkhead to avoid damage to
electrical components. Turn
off the battery master switch
to isolate the batteries before
disconnecting any compo-
nents. After welding connect
all of the above in reverse
order.
Before any welding is done
ensure all paint has been
removed from the area to be
welded. Failure to do so may
result in hazardous fumes
being given off from the paint.
Always fasten the welding
machines ground cable to the
piece/frame being welded if
possible.
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