Section 07: TRANSMISSION
PA1562
8
external circuits, coolers, and all other areas
where the particles could lodge.
CAUTION
If excessive metal contamination has occurred,
replacement of the oil cooler and replacement
of all bearings within the transmission is
recommended.
3.1.10 Coolant Leakage
If engine coolant leaks into the transmission oil
system, immediate action must be taken to
prevent malfunction and possible serious
damage. The transmission must be completely
disassembled, inspected, and cleaned. All traces
of the coolant contamination must be removed.
Friction clutch plates contaminated with ethylene
glycol must be replaced.
3.1.11 Control System Prognostics
The transmission control system includes the
provision for the user to monitor various
transmission operating parameters.
Transmission operating parameters monitored
by the prognostics feature are:
o Oil Life Monitor
o Filter Life Monitor
o Transmission Health Monitor
NOTE
The prognostics package requires the use of
TranSynd™ or an Allison approved TES-295
licensed fluid in the transmission and Allison High
Capacity filters. If any other fluids or filters are
used, Prognostic mode must be disabled.
Prognostic information will not be accurate with any
other fluids or filters and could result in missed
maintenance activities resulting in transmission
damage.
Refer to TES 295 Approved Fluids list, found under
the Service/Fluids heading on the home page of
the Allison Transmission web site.
www.allisontransmission.com
When a specified threshold is detected for any
of the serviceable conditions, the
TRANSMISSION SERVICE indicator
is
illuminated to alert the operator. Failure to attend
to the service condition and reset the
TRANSMISSION SERVICE indicator within a
defined operating period will result in illumination
of the CHECK TRANS light on the dashboard
telltale panel, indicating the increased probability
that the service condition will develop into a
more serious condition.
To access the Prognostic Mode functions,
simultaneously press the
(Up) and (Down)
arrow buttons repeatedly. See the reference
table at the end of this section.
o Oil Life Monitor
The display message denotes the calculated
remaining life of the transmission fluid. This
value is based on the established life for the
required baseline fluid, and then is continuously
adjusted for cumulative effects of such operating
parameters as operating time, retarder
operation, output shaft revolutions and shift
frequency.
Display: The display is a two-digit number,
denoting percentage of the fluid life which
remains. New fluid is displayed as 99%.
The TRANSMISSION SERVICE indicator
will
be illuminated, denoting a required change of
transmission fluid, when the remaining fluid life
reaches approximately 1–2 %. The indicator will
be lit steadily upon each initialization of the
TCM, and will remain on steady for
approximately 1–2 minutes after the first
selection of “D” (drive) range each time, until
service is performed and the indicator is reset.
Failure to perform maintenance and reset the
TRANSMISSION SERVICE indicator within a
defined period will result in the illumination of the
CHECK TRANS light on the dashboard telltale
panel and diagnostic code P0897 Transmission
Fluid at Limit will be set.
Reset: The TRANSMISSION SERVICE
indicator can be reset by a message over the
SAE J1939 communication interface, with the
Allison DOC™ for PC diagnostic program, or by
depressing and holding the MODE button for ten
(10) seconds while the Oil Life Monitor function
is displayed. It may also be reset by selecting N-
D-N-D-N-R-N on the shift selector, pausing
briefly (less than 3 seconds) between each
selector movement, with the ignition on and the
engine not running.
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