Meritor Drive Axle Recommended Lubricant
Lubricant Type Ambient Temperature Viscosity Grade Meritor Specification
Synthetic Gear Oil
–40°F (–40°C) and up
*
75W–90 0–76–N
–40°F (–40°C) and up
*
75W–140 0–76–M
*
There is no upper limit on the ambient temperature.
Table 3, Meritor Drive Axle Recommended Lubricant
Meritor Drive Axle Lubricant Capacities for Single
Axles
Axle Model
Capacity
*
:
pt (L)
MS–10–113D 14 (6.6)
MS–12–113D 15 (7.1)
RS–13–120 18.4 (8.7)
RS–15–120 14.3 (6.8)
RS–17–145 33.6 (15.9)
RS–17–144 32.3 (15.3)
RS–19–144 32.3 (15.3)
RS–19–145 33.2 (15.7)
RS–21–145 32.3 (15.3)
RS–21–160 39.5 (18.7)
RS–21–230 38.9 (18.4)
RS–23–160 39.5 (18.7)
RS–23–161 39.5 (18.7)
RS–23–186 47.3 (22.4)
RS–23–240 37.4 (17.7)
RS–26–185 38.0 (18.0)
RS–30–185 38.0 (18.0)
*
Quantities listed are approximate and include 1 pint (0.5 liter) for each
wheel end and with the drive pinion at 3 degrees.
Table 4, Meritor Drive Axle Lubricant Capacities for
Single Axles
Meritor Drive Axle Lubricant Capacities for Tandem
Axles
Axle Model Axle Position Capacity
*
RT–40–145
Forward 30.2 (14.3)
Rear 25.8 (12.2)
RT–40–145P
Forward 30.2 (14.3)
Rear 25.8 (12.2)
Meritor Drive Axle Lubricant Capacities for Tandem
Axles
Axle Model Axle Position Capacity
*
RT–40–160
Forward 39.1 (18.5)
Rear 34.4 (16.3)
RT–44–145
RT–44–145P
Forward 29.3 (13.9)
Rear 25.1 (11.9)
RT–46–160
Forward 39.1 (18.5)
Rear 34.4 (16.3)
*
Quantities listed are approximate and include 1 pint (0.5 liter) for each
wheel end and with the drive pinion at 3 degrees.
Table 5, Meritor Drive Axle Lubricant Capacities for
Tandem Axles
35–03 Axle Lubricant Changing
and Magnetic Plug
Cleaning
A regular schedule for changing the axle lubricant in
a particular vehicle and operation can be accurately
determined by analyzing oil samples taken from the
axle at specified intervals or mileages. Lubricant
suppliers frequently make their laboratory facilities
available for determining the useful life of their
product under actual service conditions. The final
schedule that is recommended may, for economic
reasons, be related to lubricant changes that are
governed by climatic conditions and magnetic plug
maintenance. Change lubricant type and viscosity as
climatic temperatures demand, regardless of vehicle
mileage or established change schedule.
The normal operating temperature of compounded
lubricants during the summer season is about
160 to 220°F (71 to 104°C). The chemicals and
additives that give these lubricants increased load
carrying capacity oxidize faster at temperatures
above 220°F (104°C), contributing to more rapid
lubricant deterioration. For this reason lubricants of
Rear Axle 35
Business Class M2 Plus Maintenance Manual, 02/10/2023 35/3
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