Table 1–2.
Operating Temperature Requirements for Transmission Fluid
Viscosity Grade DEXRON®-III SAE 10W SAE 15W-40 SAE 30 SAE 40
Ambient Temperature Below Which Preheat Is Required Fahrenheit
Celsius
–17
–27
–4 5 32 50
–20 –15 0 10
Ref. 13-TR-90.
1–6. TRANSMISSION FLUID AND FILTER CHANGE INTERVALS a. Frequency.
Transmission fluid and filter change frequency is determined by severity of transmission service and by the filter equipment installed. Table 1–3 is a general guide. More frequent changes may be required when operating conditions create high levels of contamination or overheating. Table 1–3. Transmission Fluid and Filter Change Intervals
Fluid Change Interval 50,000 miles (80 000 km) or 12 months or 1200 hours*
Internal Sump and Governor Filter At overhaul
Standard Main Pressure External Filter** After first 5000 miles (8 000 km) and at each 25,000 miles (40 000 km) or 6 months or 600 hours, thereafter*
* Whichever occurs first. ** An Allison high efficiency filter may be used until the change filter light indicates it is contaminated or until it has been in use for three years, whichever occurs first. No mileage restrictions apply.
b. Abnormal Conditions. Transmission fluid must be changed whenever there is evidence of dirt or a high temperature condition. A high temperature condition is indicated by the transmission fluid being discolored or having a strong odor, or by fluid analysis. Local conditions, severity of operation, or duty cycle require more or less frequent fluid or filter change intervals.
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