ALLISON-OM1334EN

Check the fluid level by the following procedures and record any abnormal fluid level,

milky appearance, or any trace of coolant in the fluid on your maintenance records.

Cold Check

• Park the vehicle on a level surface, set the parking brake and/or emergency

brakes, and chock the vehicle wheels.

• Run the engine at 1000–1500 rpm for 1 minute to purge air from the system.

Return engine to idle, then shift to

(Drive) and then to

(Reverse) to fill the

hydraulic circuits with fluid. Then shift to

(Neutral) or

(Park) and allow

the engine to idle (500–800 rpm). A cold check should be made when the

sump fluid temperature is 60–120˚F (16–49˚C). This temperature typically

occurs within the first ten minutes of operation during initial start-up.

• Clean around the end of the fill tube before removing the dipstick. Wipe the

dipstick clean and check the fluid level. If the fluid on the dipstick is within

the COLD RUN or REF FILL band, the level is satisfactory for operating the

transmission until the fluid is hot enough to perform a HOT RUN check. If the

fluid level is not within the COLD RUN or REF FILL band, add or drain fluid

as necessary to bring the level to the middle of the band.

• Perform a hot check at the first opportunity.

NOTE:

The only purpose of the Cold Check is to determine if the

transmission has enough fluid to be safely operated until a Hot Check

can be made.

CAUTION

: The fluid level rises as sump temperature increases.

DO NOT fill above the COLD RUN band if the transmission fluid

is below normal operating temperature.

NOTE:

To ensure an accurate cold check, operate the transmission

until the sump fluid temperature is 60–120°F (16–49°C). This

temperature is usually reached within the first ten minutes of operation

from initial start-up.

ALLISON AT, MT, HT SERIES ON-HIGHWAY TRANSMISSIONS

OPERATOR'S MANUAL

2000