Medium Duty Operator's Manual - Peterbilt Motors Company

Preventive Maintenance
TRANSMISSION AND CLUTCH
Introduction
Follow these steps to ensure parts are properly lubricated:
• Maintain oil level, check it regularly
• Change oil regularly
• Use the correct grade and type of oil
• Buy oil from a reputable dealer
All Transmissions
Oil Change: Drain and replace according to Table 1, “Recommended
Maintenance Intervals,” Page 150 and the
Transmission Service Manual. Use the recommended types
of oil as specified in the Operation and Service Manual
(included with vehicle). Select the appropriate lubricant for
the expected ambient (outside air) temperatures.
Transmission Lubricants
Transmission and Clutch
CAUTION: When adding oil, types and brands of
oil should not be intermixed because of possible
incompatibility, which could decrease the effectiveness
of the lubrication or cause component
failure.
Manual Transmissions
Manual transmissions are designed so that the internal parts
operate in a bath of oil circulated by the motion of gears and
shafts.
Service Intervals
For recommended types and brands of all lubricants, see the
transmission manufacturer's Service Manual and Table 1,
“Recommended Maintenance Intervals,” Page 150.
Medium Duty (R05/09) Y53-6008A – 233 –