Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

Preventive Maintenance
Rear Axle and Suspension
Table 11 Drive Axle Lubrication
MODEL
RECOMMENDED LUBRICANTS
AMBIENT TEMPERATURE RANGE
° C ° F
VISCOSITY (SAE)
EATON,
ROCKWELL
EP gear oil, MIL-L-2105D, API GL-5. -26 to +38 -15 to +100 80W-90
Synthetic Lubricant: Chevron RPM
Synthetic Gear Lubricant, or equal, meeting
MIL-L-2105D and Eaton PS-037 specification.
-40 to +38 -40 to +100 75W-90
• No initial drain is required on Eaton axles that are factory
filled with an Eaton-approved synthetic lubricant.
• Petroleum-based lubricants must be drained within the
first 5,000 miles (8000 km) if converting to an approved
synthetic lubricant.
See Table 1, “Recommended Maintenance Intervals,”
Page 154 for standard rear axle service intervals.
• Use petroleum-based lubricants meeting MIL–L–2105–
C/D grade specifications or approved synthetic lubrication.
Do not use oil additives.
To change axle lubricant:
1. Park the vehicle on level ground with the axle lubricant at
normal operating temperature.
2. Remove filler (1) and drain plug (2).
3. Completely drain the oil and clean the drain plug.
CAUTION: Do not overfill axles.
4. Reinstall the drain plug (2) and refill with recommended
oil up to the bottom of filler plug hole.
5. Reinstall filler plug (1).
Medium Duty (R05/09) Y53-6027 – 251 –