5. Maintenance Interval Chart-(EATON FULLER Only)
Automatic Transmission (Allison Auto)
No Longer Approved Fluids
DEXTRON and Allison C4 Transmission Fluids are no longer approved for new commercial
On-Highway products.
Approved Fluids
Proper Fluid Level
Because the transmission fluid cools, lubricates, and transmits hydraulic power, it is
important that the proper fluid level be maintained at all times. If the fluid level is too low,
the converter and clutches do not receive an adequiate supply of fluid. If the fluid level is
too high, the fluid will aerate. Aerated fluid can cause the transmission to shift erratically or
overheat. The MD, HD and B Series have an optional oil level (OLS) sensor that allows the
operator to obtain an indication of fluid level from the shifter selector.
341P/N 12261-683 REVISED: January 2015
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