A severely low fluid level causes the Allison Transmission Electronic Control to do two things automatically — • Turn on the CHECK TRANS light • Prevent upshifting into the highest range When the fluid level is corrected, the transmission will return to normal operation. Do not use the Electronic Control to replace regular fluid level checks. Check the level at the intervals specified in your vehicle service instructions.
1–3. TRANSMISSION FLUID CHECK PROCEDURES WARNING: Take the following precautions so that unexpected, possible sudden vehicle movement is avoided. Whenever it becomes necessary to leave the vehicle, even momentarily, while the engine is running, place the transmission shift selector in Neutral, set the parking brake and/or emergency brakes and chock the wheels. a. Fluid Check Procedure.
Clean all dirt from around the end of the fill tube before removing the dipstick. Do not allow the dirt or any foreign matter to enter the transmission. Dirt or foreign matter may cause undue wear of the transmission parts, make valves stick, and clog passages. Check the fluid level, manually, using the following procedure and record the level in your maintenance log. To perform the fluid level check, the engine must be running at idle speed and the transmission must be in N (Neutral). Add transmission fluid to the transmission through the fill tube opening. Be sure to use proper transmission fluid and fluid containers as discussed in Sections 1–4 and 1–5. Refer to Table 1–1 for approximate transmission fluid capacity. Table 1–1. Transmission Fluid Capacity
Application
U.S. Quarts
Liters
34
32
6 inch (152 mm) oil pan
30
28.5
7 inch (178 mm) oil pan
30
28.5
81⁄ 2
43
41
41⁄ 2
inch (114 mm) oil pan
inch (215 mm) oil pan
NOTE: Does not include external circuits.
2
