Table 1–2.
AT Transmission
On-Highway, Light-Duty
On-Highway, Heavy-Duty, Retarder
Off-Highway
Fluid and Filter Change Intervals
Fluid Change
Internal Sump
External Auxiliary Filters**
Paper Filter: 25,000 miles (40 000 km) or 12 months* Brass Filter: 50,000 miles (80 000 km) or 24 months*
Paper Filter: at each fluid change interval Brass Filter: 50,000 miles (80 000 km) with no time limit
After first 5000 miles (8 000 km) and at 25,000 miles (40 000 km) or 12 months, thereafter*
Paper or Brass Filter: 25,000 miles (40 000 km) or 12 months*
Paper Filter: at each fluid change interval Brass Filter: 50,000 miles (80 000 km) with no time limit
After first 5000 miles (8 000 km) and at normal fluid change intervals, thereafter*
Paper or Brass Paper or Brass After first 500 hours, Filter: 1000 hours Filter: at each fluid and at normal fluid max or 12 months* change interval change intervals thereafter*
* Whichever occurs first.
** When an Allison high-efficiency filter is used, the change interval is until the Change Filter light indicates the filter is contaminated or until it has been in use for three years, whichever occurs first. No mileage restrictions apply.
A brass screen sump filter is available for all AT 500 and AT 1500 Series transmissions for both the shallow pan and the deep pan models. To convert an AT deep pan 5.3 inches (135 mm) with paper filter to the brass screen filter configuration, a service conversion kit is required. Refer to Service Information Letter (SIL) 5-TR-93 (latest revision).
1–8. FLUID AND FILTER CHANGE PROCEDURE a. Drain • The transmission should be at operating temperature to assist draining. • Remove the drain plug from the pan. Disconnect the fill tube from the pan only if required. • Examine the drained fluid for evidence of contamination (refer to Paragraph 1–9).
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