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Each 20,000-Miles or Four Months
(Whichever comes first)
• Inspect brake drums and wheels.
• Inspect brake linkage and shoes.
• Inspect brake lines and hoses for chafing, looseness and deterioration.
• Test brakes for action, side pull, and synchronization.
• If equipped with skid control, run complete system check.
• Make soap suds test for air leaks in entire air system.
• Check axle alignment.
• Check undercarriage components.
• Check springs, hangers, and bushings.
• Inspect kingpin for excess wear, rough edges, looseness, broken out areas and cracks.
• Clean kingpin plate and all welds.
• Check all bolts, nuts and rivets for looseness.
NOTE: All maintenance periods are recommendations based on average operating conditions. A trailer
operated principally on gravel or dusty roads, or through unusual amounts of water may require
maintenance more frequently and should be serviced as required.
NONSCHEDULED MAINTENANCE SERVICE REQUIRED
Probable Cause Remedy
Wheel removed, relining brakes, or if
leaking oil
Replace wheel seals
Wheel removed, relining brakes, seal leaks or
excessive end play
Adjust and clean wheel bearings
Tires show uneven wear Inspect and rotate wheels
Wheel removed or relined
Lubricate earn heads, rollers, and anchor
pins
Dog tracking or excess tire wear Align axles
Annually, or if leaking Replace gladhand seals
5/16" thickness or less to be replaced Reline brakes
At brake reline, or more often if hard service Diaphragms in air chambers
As Required Steam clean complete chassis and inspect
Observe the day-to-day care recommendations. Watch for the symptoms described under Nonscheduled
Maintenance above, and have any needed adjustments made promptly at your local
PRATT.
USE ONLY the
recommended lubricants and parts conforming to
PRATT
specifications.
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