Allison DOC™ Message
OL — SUMP TEMP HI
OL — OUTPUT SPEED HI
OL — CHECK CODES
• Exiting the Fluid Level Mode. Exit as follows:
— For a pushbutton shift selector, press the N (Neutral) pushbutton once.
— For a lever selector, press the DISPLAY MODE/DIAGNOSTIC
button once or move the lever to a range position.
— Allison DOC™ does not use a special Fluid Level Mode.
b. Manual Fluid Test Procedure.
WARNING: To help avoid personal injury or property damage caused
by sudden and unexpected vehicle movement, do not determine the
fluid level until you:
1. Put the transmission into N (Neutral).
2. Apply the parking brake and emergency brakes and make sure
they are properly engaged.
3. Chock the wheels and take any other steps necessary to keep the
vehicle from moving.
Clean all dirt from around the end of the fluid fill tube before removing the
dipstick. Do not allow dirt or 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. Determine the fluid level using the
following procedure and report any abnormal fluid levels to your service
management.
c. Cold Test Procedure. The purpose of the cold test is to determine if the
transmission has enough fluid to be safely operated until a hot test can be made.
CAUTION: The fluid level rises as fluid temperature increases. DO
NOT fill above the “COLD CHECK” band if the transmission fluid is
below normal operating temperature. During operation, an over full
transmission can become overheated, leading to transmission damage.
1. Park the vehicle on a level surface. Apply the parking brake and chock the
wheels.
2. Run the engine for at least one minute. Shift to D (Drive), then to
N (Neutral), and then to R (Reverse) to fill the hydraulic system.
3. Shift to N (Neutral) and allow the engine to idle (500–800 rpm).
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