Hot Check

122SD mm 26.02.03

    Notice: As the fluid temperature increases, so does the fluid level. Do not fill above the COLD RUN band if the transmission fluid is below normal operating temperature.

    Note: Perform a hot check at the first opportunity after the normal operating temperature, 160 to 200°F (71 to 93°C), has been reached.

  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. nsert 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..

    1. Cold Run Band

    2. Hot Run Band

    Fig. 1, Dipstick Markings

Note:
Parent topic: Allison
Document Number: 0000125508
Manual Publication Date: 2025-02-11
Topic Publication Date: 2024-06-21