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Checking Level (Cold)

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NOTE: The fluid level rises as fluid temperature increases. DO NOT fill above the "COLD CHECK" band if the transmission fluid is below normal operating temperatures. If the fluid level is within the "COLD CHECK" band, the transmission may be operated until the fluid is hot enough to perform a "HOT RUN" check. If the fluid level is not within the "COLD CHECK" band, add or drain as necessary to bring it to the middle of the "COLD CHECK" band. Always check the fluid level at least twice using Checking Level (Cold). Consistent readings are important to maintaining proper fluid level. If inconsistent readings persist, check the transmission vent assembly to be sure that it is clean and unclogged. If readings are still inconsistent, contact your nearest Allison dealer.
NOTE: The purpose of the cold check is to determine if the transmission has enough fluid to be operated safely until a hot check can be made.
  1. Bring the vehicle to a complete stop on a level surface using the service brakes.
  2. Ensure the engine is at low idle (500-800 RPM).
  3. With the service brakes applied, put the transmission in Park position.
  4. Engage the park pawl by slowly releasing the service brakes. The vehicle may move slightly as the pawl engages.
  5. Apply the parking brake and make sure it is properly engaged.
  6. Run the engine for at least one minute. Apply the service brakes and shift to Drive, then to Neutral, and then shift to Reverse to fill the hydraulic system.
  7. Ensure the engine is at low idle (500-800 RPM).
  8. With the service brakes applied, place the transmission in the Park position.
  9. Engage the park pawl by slowly releasing the service brakes. The vehicle may move slightly as the pawl engages.
  10. With the engine running, remove the fluid level indicator from the fill tube and wipe the indicator clean.
  11. Insert the fluid level indicator into the fill tube and remove. Check the fluid level reading. Repeat the check procedure to verify the reading.
  12. Perform a hot check at the first opportunity after the normal operating sump temperature of 160-200°F (71-93°C) is reached.
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