Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

Preventive Maintenance
FRAME AND FIFTH WHEEL
Engine Painting
Do not electrostatically paint electronically controlled engines
or vehicles with these engines.
Frame Rails
WARNING! Do not cut, splice or weld on frame
rails or drill through the top or bottom flanges.
These operations could affect frame rail
strength leading to a failure resulting in an accident
causing death or injury. Always leave frame
repairs to your Peterbilt Dealer.
Fifth Wheel Maintenance
Proper preventive maintenance is essential to trouble-free
service and safe operation of the fifth wheel.
Every 2 Months or 25,000 Miles:
• Refer to specific manufacturer's literature for any special
instructions.
Frame and Fifth Wheel
• Steam clean the fifth wheel.
• Check lock guard operation using a commercial lock
tester.
• Clean and oil all moving parts.
• Lubricate the following parts with a lithium-base grease.
• Lock mechanism
• All grease fittings (especially those which grease the
top surface of the fifth wheel).
• Check for missing or loose nuts and bolts in the fifth
wheel and mounting brackets. Retighten loose bolts to
correct torque. Replace missing or damaged bolts.
Every 6 Months or 50,000 Miles:
• Refer to specific manufacturer's literature for any special
instructions.
• Remove fifth wheel from vehicle. Refer to the Medium
Duty Maintenance Manual, “Fifth Wheel Removal.”
• Steam clean the fifth wheel and mounting brackets.
• Check all moving parts for excessive wear or damage.
Replace all worn or broken parts.
• Complete two-month service procedure.
• Install fifth wheel. Refer to the Medium Duty Maintenance
Manual, “Fifth Wheel Installation.”
Medium Duty (R05/09) Y53-6027 – 255 –