Cold Check
Notice: Operating a transmission with the fluid level higher or lower than recommended can result in transmission damage. Do not overfill the transmission. Overfilling will force fluid out of the case through the main shaft openings.
Do not mix types and brands of fluid, because of possible incompatibility. Do not use fluid additives, friction modifiers, extreme-pressure gear fluids, or multiviscosity lubricants.
Important: For oil and filter change intervals, see the applicable Allison Operator's Manual.
Important: After replacing the transmission fluid or changing the filter(s), it is important to check the fluid level cold to determine if the transmission has a sufficient amount of fluid to be safely operated until a hot check can be performed.
- A cold check may be made when the sump temperature is 60 to 104°F (15 to 40°C).
- Run the engine for at least one minute to clear the fluid system of air.
- Clean all dirt away from around the end of the fluid fill
tube before removing the dipstick. With the engine running, wipe the
dipstick clean and check the fluid level. Any level within the COLD
RUN (lower) band is satisfactory for operating the vehicle. If the
level is not within the COLD RUN band, add or drain fluid until it
reaches the middle of the COLD RUN band. See Fig..
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COLD RUN Band
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HOT RUN Band
Fig. 1, Dipstick Markings
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- Perform a hot check at the first opportunity after normal operating temperature, 160 to 200°F (71 to 93°C), is reached.
Notice: Do not allow foreign matter to enter the transmission. Dirt or foreign matter in the hydraulic system may cause undue wear of transmission parts, make valves stick, and clog passages.