Semi Truck Preventive Maintenance Checklist

Is the truck’s VIN, license plate, and other identifying information clearly visible and legible?

Are all required documents (registration, insurance, permits) present and up to date?

Is the exterior and interior free of debris and clutter that could interfere with safe operation?

Have all essential fluid levels (oil, coolant, windshield washer, etc.) been visually confirmed?

Are there any visible leaks, dents, or damage on the truck’s body and undercarriage?

Is the engine oil at the proper level and free of contamination?

Is the oil free from sludge or abnormal discoloration that might indicate internal issues?

Is the coolant level correct in both the radiator and overflow tank?

Are the radiator, hoses, and clamps free of leaks, cracks, or corrosion?

Are all belts (including accessory and fan belts) intact, properly tensioned, and free of wear?

Is the engine air filter clean and securely in place?

Is the exhaust system (muffler, pipes, hangers) free of holes, corrosion, or loose fittings?

Does the oil pressure gauge indicate normal operating pressure?

Is the transmission fluid at the proper level and in good condition?

Does the clutch engage and disengage smoothly without unusual noises?

Is the drive shaft free of damage, and are the U-joints secure and lubricated?

Are the differential and axle components free of leaks and operating normally?

Is the air brake pressure reading within the recommended range on the gauge?

Are the brake pads or shoes within acceptable wear limits and securely mounted?

Are the brake drums or rotors free of excessive wear, scoring, or warping?

Are all brake lines and hoses free of cracks, leaks, or corrosion?

Does the parking/emergency brake hold the truck securely?

Are all brake lights functioning properly and clearly visible?

Are all tires inflated to the manufacturer’s recommended pressures?

Is the tire tread depth above the minimum legal limit and showing even wear?

Are there any visible cuts, bulges, or punctures on the tires?

Are all wheel lug nuts present, tightened to specification, and free of rust or damage?

Do the wheel bearings operate smoothly without unusual noise or play?

Are the shocks, struts, and bushings free from leaks and in good condition?

Is the battery securely mounted with clean terminals and no signs of corrosion?

Is the ammeter functioning correctly and indicating normal charging conditions?

Is the alternator belt properly tensioned, intact, and free of wear?

Are all dashboard gauges (oil pressure, temperature, fuel, etc.) displaying correct readings?

Are the high and low beam headlights operational and correctly aimed?

Are the tail, brake, and turn signal lights functioning and bright?

Are all side marker and clearance lights working properly?

Are all visible electrical wiring, connectors, and fuses free of damage or corrosion?

Is there a functional, up-to-date fire extinguisher present and accessible?

Is the first aid kit fully stocked, sealed, and within its expiration date?

Are reflective triangles, flares, or other warning devices available and in good condition?

Are all seat belts in the cab free of damage, properly fastened, and functioning?

Are all mirrors clean, properly adjusted, and secure?

Is the windshield free of cracks, chips, or obstructions that impair visibility?

Are the windshield wipers in good condition and is the washer fluid level adequate?

Is the fuel level indicator reading correctly?

Are all fuel lines and connections free of leaks and securely fastened?

Are the emissions control systems (e.g., EGR, catalytic converter, sensors) free of fault codes and visibly in good condition?

Is the trailer coupling secure and are all locking mechanisms functioning?

Is the trailer breakaway system operational and properly tested?

Are all trailer lights, reflectors, and signals working correctly?

Are the trailer’s tires, pressure, and suspension components in good condition and free of damage?

Are the safety chains properly connected and in good condition?

Is the air compressor operating correctly, and is the air dryer free of moisture?

Have any engine or electronic diagnostic codes been cleared or noted for further investigation?

Has the driver noted any unusual noises or vibrations during operation that might indicate emerging issues?

Does the truck perform normally during a brief road test (if time permits) to confirm handling, acceleration, and braking are as expected?