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2018.12.12
Lubrication Specifications | Appendix  TRSM0940
Lubrication Specifications 
Caution: Do not introduce additives and friction modifiers.
Caution: Never mix standard oils and synthetic 
transmis-
sion oils in the same transmission. When switching 
between 
types of lubricants, all areas of each affected com-
ponent must be thoroughly drained.
Caution: Do not mix lubricants of different grades.
Note: For a list of Eaton Approved 
Synthetic Lubricants, see 
TCMT0021 Roadranger Lubricant Products or call 
1-800-826-HELP (4357).
Note: The use of lubricants not meeting these requirements 
will 
affect warranty coverage. 
Note: For lubrication 
change and inspection intervals, see 
TCMT0021 Roadranger Lubricant Products.
Note: Please refer 
to CLSM0200 Eaton Heavy-Duty 
Clutches for clutch lubrication and service guidelines.
Buy From a Reputable Dealer
For a complete list of approved and reputable dealers, write 
to:
Eaton, Worldwide Marketing Services
P.O. Box 4013
Kalamazoo, MI 49003
Transmission Operating Angles
If the transmission operating angle is more than 12 
degrees, or approximately a 21% grade, improper lubrica-
tion will occur. The operating angle is the transmission 
mounting angle in the chassis plus the
 percent of upgrade 
(expressed in degrees). 
For operating angles over 12 degrees, the 
transmission 
must be equipped with an oil pump or cooler kit to ensure 
proper lubrication.
Transmission filters should b
e changed during regular 
lubrication intervals. Inspection of the transmission filter 
should be conducted during preventative maintenance 
checks for damage or corrosion. Replace as necessary.
Operating Temperatures 
Transmissions must not be operated at temperatures that 
are consistently above 250°F (121°C). Operation at tem-
peratures above this limit causes loaded gear tooth tem-
peratures to exceed 350°F (177°C) whi
ch will ultimately 
destroy the heat treatment of the gears.
The following conditions, in 
any combination, can cause 
operating temperatures that exceed 250°F (120°C): 
• Operating consistently at high loads/slow speeds
• High ambient temperatures
• Restricted air flow around the transmission
• Exhaust system too close to the transmission
• High horsepower operation
• Use of engine retarders
Maintenance and Lubricant Change 
Intervals
Transmission inspections and lubricant changes are out-
lined below.
For a list of Eaton Roadranger-approved lubricants, 
see 
TCMT0020 Roadranger Lubricant Products.
Interval Description
First 1,000 to 
1,500
 miles
Inspect oil levels. Check for leaks.
Every 2,500 
mile
s
Inspect lubricant level. Perform 
Transmission Inspection.
Every 5 years or 
50
0,000 miles, 
whichever 
occurs first
Change oil and filters.