Installation Requirements
Lubrication Requirements Operating Temperatures with Oil Coolers
The following conditions in any combination can cause operating temperatures of over 250°F (120°C): •
Operating consistently at 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. 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 (120°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 lbsft [1898 Nm] or greater torque With engines 450 H.P. and above With engines 1500 lbs-ft [2033 Nm] and above
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Installation Requirements
Operating at temperatures above 250°F (120°C) causes loaded gear tooth temperatures to exceed 350°F (177°C) which will ultimately destroy the heat treatment of the gears. Temperatures above 250°F (120°C) should be regarded as a warning of inadequate cooling. If the elevated temperature is associated with unusual operating conditions that will reoccur, a cooler should be added, or the capacity of the existing cooling system increased.
