2–4. KEEPING FLUID CLEAN
Prevent foreign material from entering the transmission by using clean containers,
fillers, etc. Lay the dipstick in a clean place while filling the transmission.
CAUTION: Containers or fillers that have been used for antifreeze
solution or engine coolant must NEVER be used for transmission fluid.
Antifreeze and coolant solutions contain ethylene glycol which, if put
into the transmission, can cause the clutch plates to fail.
2–5. FLUID RECOMMENDATIONS
The hydraulic fluid (oil) used in the transmission directly affects transmission
performance, reliability, and durability. Customers may continue to choose from a
wide variety of approved DEXRON
®
–III or Allison qualified C4 fluids. Customers
may elect to use TranSynd™ or TES 295 equivalent and extend drain-intervals.
Equivalent TranSynd™ fluid must meet or exceed TES 295 specifications.
TranSynd™ is a fully synthetic transmission fluid developed by Allison
Transmission and Castro, Ltd. and is fully qualified to the GM TES 295
specifications.
DEXRON
®
-III fluids are also acceptable for off-highway applications. To be sure
a fluid is qualified for use in Allison transmissions, look for fluid license or
approval numbers on the container, or consult the lubricant manufacturer. Consult
your Allison Transmission dealer or distributor before using other fluid types.
CAUTION: Disregarding minimum fluid temperature limits can result
in transmission malfunction or reduced transmission life.
When choosing the optimum viscosity grade of fluid, duty cycle, preheat
capabilities, and/or geographical location must be taken into consideration. Table
2–4 lists the minimum fluid temperatures at which the transmission may be safely
operated without preheating the fluid. Preheat with auxiliary heating equipment or
by running the equipment or vehicle with the transmission in neutral for a
minimum of 20 minutes before attempting range operation.
Table 2–4. Transmission Fluid Operating Temperature Requirements
Ambient Temperature Below Which Preheat
is Required
Viscosity Grade Celsius Fahrenheit
TranSynd™/SAE 0W–20
* –30 –22
DEXRON
®
–III –25 –13
SAE 10W –20 –4
27
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