Cold Check

sd mm 26.01.002

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.

Clean all dirt from around the end of the fluid fill tube before removing the dipstick. 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.

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.

  1. Park the vehicle on a level surface, apply the parking brakes, and chock the tires.
  2. Run the engine for at least one minute.
  3. Shift from DRIVE to NEUTRAL, and then shift to REVERSE to fill the hydraulic system.
  4. Shift to NEUTRAL and allow the engine to idle at 500 to 800 rpm.
  5. With the engine running at idle, remove the dipstick from the tube and wipe it clean.
  6. Insert the dipstick into the tube, then remove it.
  7. Check the fluid level reading, then repeat the check procedure to verify the reading.

    If the fluid level is within the COLD RUN band, the transmission may be operated until the fluid is hot enough to perform a hot check.

    If the fluid level is not within the COLD RUN band, add or drain fluid as needed to adjust the fluid level to the middle of the COLD RUN band. See Fig..

    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.

    • Cold Run Band

    • Hot Run Band

    Fig. 1, Dipstick Markings

Note:
Parent topic: Allison
Document Number: 0000119714
Manual Publication Date: 2024-05-23
Topic Publication Date: 2024-11-06