Basic Trailer Maintenance Checklist

Trailer maintenance starts with the manual for the exact trailer and its components. Axles, brakes, hubs, tires, couplers, hydraulic systems and accessories can have different procedures and intervals. Use this checklist to organize the work, then follow the manufacturers’ specifications for inspection, lubrication, adjustment, torque and replacement.

A pre-trip check is not a repair. If a brake, tire, bearing, wheel, coupler, weld or structural component appears damaged, stop and have it evaluated before towing.

Check pressure when tires are cold and follow the trailer placard, owner’s manual and tire guidance that applies to the trailer. Do not use appearance alone to judge pressure. Also verify tire size, type and load capacity when replacing tires; installing a higher-rated tire does not increase the trailer, axle or wheel rating.

Inspect for irregular wear, exposed cords, cracking, cuts, bulges, embedded objects and age. NHTSA notes that age recommendations vary by vehicle and tire manufacturer, so use those instructions and the tire identification date rather than a universal replacement deadline. Tighten wheel fasteners only to the specified torque and schedule.

Test brake response before entering traffic. Inspect wiring and connectors for damage, and maintain the breakaway battery and switch as directed. Brake adjustment, lining inspection, hydraulic inspection and electrical testing require the component manufacturer’s procedure and often belong with a qualified technician.

First identify the axle and lubrication system. Standard grease, grease-through-spindle systems, oil-bath hubs and sealed bearing systems do not share one procedure. Mixing incompatible grease or applying the wrong service method can damage components or contaminate brakes.

Dexter’s published maintenance material is a useful example: its schedule calls for checks at every use and component work at mileage or time intervals, while its bearing instructions say applicable serviceable bearings should be lubricated every 12 months or 12,000 miles. That is not a universal interval for every axle. Follow the label and manual for the components actually installed.

Watch for grease or oil on the inside of a wheel, around the hub or near brake components. Heat, noise, looseness, leakage or contaminated brake parts call for inspection. Nationwide Trailers offers trailer bearing service when the hub needs more than a walkaround check.

Clean and lubricate only where the manufacturer specifies. Inspect latches, pins, fasteners, welds, chain links and attachment points for wear, cracks, deformation or corrosion. Confirm the ball and coupler size match. Replace damaged safety equipment instead of improvising a repair.

Inspect the plug, junctions and visible wiring for corrosion, abrasion, loose connections and exposed conductors. Keep wiring supported away from moving or hot parts. Diagnose repeated fuse failures or intermittent brake operation instead of treating a replacement fuse as the repair.

Wash away dirt and road chemicals so cracks, corrosion and loose hardware are visible. Inspect the frame, crossmembers, deck, ramps, gates, doors and tie-down points. On dump or hydraulic trailers, check hoses, fittings, cylinders, reservoir and battery according to the manufacturer’s procedure. Never work beneath a raised body without the specified mechanical support in place.

A written record makes recurring wear easier to spot and prevents interval-based service from becoming guesswork. For a professional inspection or repair, schedule trailer service and bring the component labels or manual with you.

Review the record before long trips and after hard use, impacts or overload concerns. An inspection based on what actually happened is more useful than waiting for the next calendar reminder.