Installation Requirements
Cooler Requirements Heavy Duty UltraShift/AutoShift Gen 3 Cooler Requirements •
Transmissions must not be operated at temperatures above 250°F [121°C]. Operation at temperatures above 250°F [121°C] causes loaded gear tooth temperatures to exceed 350°F [177°C] which will ultimately destroy the heat treatment of the gears. If the elevated temperature is associated with an unusual operating condition that will recur, a cooler should be added, or the capacity of the existing cooling system increased.
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The following conditions in any combination can cause operating temperatures of over 250°F (120°C):[see page 20]. •
Operating consistently at high loads/slow speeds
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High ambient temperatures
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Restricted air flow around the transmission
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Exhaust system too close to the transmission
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High horsepower operation
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Engine Retarders
External oil coolers are available to reduce operating temperatures when the above conditions are encountered. Eaton Oil cooler systems must meet a minimum requirement of 3/4 I.D. cooler lines and 8 GPM. system flow @ 1500 RPM. The end user is ultimately responsible for maintaining transmission lube temperatures below 250°F [121°C]. Transmission Oil Coolers are recommended
Transmission Oil Coolers are required
With engines of 350 H.P. and above
With engines 400 H.P. and above and GCW’s of 90,000 lbs [40,823 kg] or greater With engines 400 H.P. and above and 1400 lbs. ft. [1898 N•m] or Greater torque With engines 450 H.P. and above With engines 1500 lbs. ft. [2033 N•m] and above
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