Section 07: TRANSMISSION
PA1562
7
high, the fluid can aerate, causing the
transmission to shift erratically or overheat.
3.1.6 Keeping Oil Clean
Oil must be handled in clean containers, fillers,
etc., to prevent foreign material from entering the
transmission. Place the dipstick on a clean
surface area while filling the transmission.
CAUTION
Containers or fillers that have been used to
handle antifreeze or engine coolant must
NEVER be used for handling transmission fluid.
Antifreeze and coolant solutions contain
ethylene glycol that, if introduced into the
transmission, can cause the clutch plates to fail.
3.1.7 Recommended Automatic Transmission
Fluid
Hydraulic fluids used in the transmission are
important influences on transmission
performance, reliability and durability. Castrol
TranSynd™ Synthetic Fluid, DEXRON-III® and
DEXRON-VI® fluids are recommended for on-
highway applications.
• TranSynd™ is a full synthetic transmission
fluid developed by Allison Transmission and
Castrol Ltd. This fluid meets Allison
specifications for Severe Duty and Extended
Drain Intervals. TranSynd™ is fully qualified to
the Allison TES295 specifications and is
available through Prevost Parts.
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.
• To be sure a fluid is qualified for use in Allison
transmission, check for the DEXRON-III® or
DEXRON-VI® license numbers on the
container or consult the lubricant
manufacturer. Consult your Allison
Transmission dealer or distributor before using
other fluid types.
Customers may use TranSynd™/TES 295
equivalent and extend drain intervals. Equivalent
TranSynd™ fluid must meet or exceed TES 295
requirements. Customers may choose from a
wide variety of approved Dexron-III® fluids.
Customers may choose from a wide variety of
approved non-TES 295 like Dexron-III®, Dexron-
VI® or approved Schedule 1 TES-389 fluids.
The Transmission Fluid Operating Temperature
Requirements table lists the minimum fluid
temperatures at which the transmission may be
safely operated without preheating. Preheat with
auxiliary heating equipment or by running the
equipment or vehicle with the transmission in «N»
(Neutral) for a minimum of 20 minutes before
attempting range operation.
Transmission Fluid Operating Temperature Requirements
Minimum operating temperature
Fluid type
Celsius Fahrenheit
TranSynd™ -30 -22
DEXRON-VI
®
-25 -13
CAUTION
Disregarding minimum fluid temperature limits
can result in transmission malfunction or
reduced transmission life.
NOTE
The use of an arctic preheat kit is
recommended at temperatures below -25ºF (-
32ºC). If a preheat kit is not available, the TCM
will restrict full operation until the sump
temperature is increased.
3.1.8 Oil Contamination
At each oil change, examine the drained oil for
evidence of dirt or water. A nominal amount of
condensation will emulsify during operation of the
transmission. However, if there is evidence of
water; check the cooler (heat exchanger) for other
signs of leakage. This, however, may also
indicate leakage from the engine oil system.
3.1.9 Metal Particles
Metal particles in the oil (except for minute
particles normally trapped in the oil filter) indicate
damage has occurred in the transmission. When
these particles are found in the sump, the
transmission must be disassembled and closely
inspected to find the source. Metal contamination
will require complete disassembly of the
transmission and cleaning of all internal and
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