A SERVICE OF

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Preventive Maintenance Frame and Fifth Wheel
Medium Duty
(R10/06) Y53-6008 – 219 –
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:
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 Mainte-
nance 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.