Peterbilt Medium Duty Trucks Operator's Manual after 1-07

Preventive Maintenance
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.
• 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:
Frame and Fifth Wheel
• 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.”
Sliding Fifth Wheel
• Lubricate bearing surface of support bracket through the
grease fittings on the side of the fifth wheel plate. Use a
water resistant lithium-base grease.
NOTE: The plate must be lifted up slightly to
relieve the weight of the bracket while applying
grease.
Medium Duty (R10/06) Y53-6008 – 219 –