Hot Check

sd mm 26.01.003

Notice: Operating a transmission with the fluid level higher or lower than recommended can result in transmission damage. Do not overfill the transmission.

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.

Note: For Allison transmissions equipped with an oil level sensor, the transmission fluid level can be checked electronically. For more information, refer to the Allison Transmission website, www.allisontransmission.com.

  1. Park the vehicle on a level surface, apply the parking brakes, and chock the tires.
  2. Shift the transmission to NEUTRAL.
  3. Operate the engine at idle (500 to 800 rpm) until normal operating temperature is reached. Check that the sump temperature is 160 to 200°F (71 to 93°C). Check that the converter-out temperature is 180 to 220°F (82 to 104°C).
  4. With the engine idling, remove the dipstick from the tube and wipe it clean.
  5. Insert the dipstick into the tube, then remove it.
  6. Check the fluid level reading, then repeat the check procedure to verify the reading. Safe operating level is within the HOT RUN band on the dipstick. The HOT RUN band is between the HOT FULL and HOT ADD marks.
    If the fluid level is not within the HOT RUN band, add or drain fluid as needed to bring the fluid level within the HOT RUN band. See Fig..

    • Cold Run Band

    • Hot Run Band

    Fig. 1, Dipstick Markings

Note:
Parent topic: Allison
Document Number: 0000119713
Manual Publication Date: 2024-05-23
Topic Publication Date: 2024-11-06