To make sure your vehicle is ready to operate, conduct a pre-trip inspection at the beginning of each work period. Follow the steps listed in this section to verify a proper vehicle inspection procedure.
WARNING:
Exercise great caution when working on a vehicle equipped with an automatic fan clutch. The fan starts in motion only after the engine coolant reaches a predetermined temperature or the refrigerant pressure (if equipped with air conditioning) reaches a predetermined setting. The fan starts at this point with no advance warning. Never reach near, or permit objects to protrude into, the fan blade radius while the engine is running as this could result in vehicle damage, personal injury or death.
WARNING:
Do not operate the vehicle if any suspension conditions listed in the following charts are evident. Loss of steering or suspension could result in property damage, personal injury or death.
WARNING:
If a wheel must be changed, obtain expert tire service help. Mounting and un-mounting of tires should only be performed by a qualified technician using necessary safety procedures and equipment, otherwise the result could be property damage, personal injury or death. |
Note:
Always make sure you apply the parking brake before starting the engine.
| Engine compartment (with engine off)
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| Engine oil
| Use the dipstick to verify the oil level is in the proper operating range. See
Engine Oil Dipstick - 6.8L.
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| Engine coolant
| Look through the plastic reservoir and verify the coolant level is within the proper operating range. Do not remove the pressure cap until the coolant has cooled. See
Engine Coolant Check - 6.8L.
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| Power steering fluid
| Verify that the fluid level is in the proper operating range. See
Power Steering Fluid Check.
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| Brake fluid
| Remove the master cylinder caps and inspect the fluid level. See
Brake Fluid Check.
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| Belts (fan, alternator, water pump and air conditioning compressor)
| Inspect for glazing, fraying or cracking. There should be no more than 5-7 cracks per rib, per
1 in (2.5 cm)
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| Fluid leaks
| Inspect for signs of fluid puddles or dripping fluid on the ground under the engine, or the underside of the engine.
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| HVAC air inlet
| Inspect for debris that may have collected on the HVAC air inlet grille or inside the exterior module as this may reduce system performance.
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| Engine starting (with parking brake applied)
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|---|
| Safety and emergency equipment
| Before entering the cab, verify that the vehicle is equipped with spare electrical fuses (if used), three red reflective triangles, a properly charged and rated fire extinguisher and wheel chocks.
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| Walk around the vehicle and verify all steps and grab handles, inside and out (as well as behind), are tight and clean. Use extreme caution and a three-point stance at all times.
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| Inspect door latches for proper closing, latching and locking.
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| Starting the engine
| Set the parking brake. Make sure the gearshift lever is in neutral (N) or park (P) (if equipped with a park position).
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| Diesel engine: Turn the key to the on position. Turn the key to start when the wait to start indicator light in the instrument cluster turns off.
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| Gasoline engine: Turn the key to start, and then release it as soon as the engine starts.
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| Engine oil pressure
| Verify pressure builds to normal operating range.
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| Low air pressure warning tone (if equipped with an air compressor)
| A tone indicating low air pressure should sound immediately after the engine starts but before the compressor has built-up pressure. The tone should stop when the air pressure reaches
70 psi (483 kPa). Let the air pressure build to governed cutout pressure, which should occur between
115–130 psi (793–896 kPa).
|
| Accelerator
| Press the accelerator and verify that it operates smoothly, without any binding or irregular feel. Release the pedal and verify the engine returns to idle speed immediately.
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| Voltmeter
| Check the gauge (diesel engine) or indicator light (gasoline engine) to verify the alternator is charging.
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| Steering linkage free play
| Inspect for excessive free play in the steering linkages. The steering wheel should have less than
2 in (5 cm) of free play at its rim.
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| Parking brake
| Verify the parking brake holds the vehicle by gently trying to pull forward with the parking brake applied.
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| Air brakes
| Verify operation using the following procedure. Chock the wheels, if necessary. Push in the parking brake and, on tractors, push in the tractor parking brake knob:
|
| 1. Verify the air compressor or governor cutout pressure is approximately
120 psi (827 kPa).
|
| 2. Turn off the engine, and then turn the key back to the on position (without starting the engine).
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| 3. Without the brake pedal applied, note the air pressure drop for one minute. It should be less than
2 psi (14 kPa) for single vehicles and
3 psi (21 kPa) for combination vehicles.
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| 4. Press and hold the brake pedal with
90 psi (621 kPa) or more. Make sure there is no more than a
3 psi (21 kPa) per minute leak for single vehicles and a
4 psi (28 kPa) minute leak for combination vehicles.
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| 5. Pump the brake pedal to deplete the system of air pressure. The warning light and tone should turn on at
57 psi (393 kPa).
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| 6. Pump the brake pedal and make sure the parking brake and trailer parking brake knobs pop out at
20 psi (138 kPa) or higher.
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| Automatic transmission fluid
| Verify that the fluid level is in the proper operating range. See
Automatic Transmission Fluid Check.
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| Front of vehicle
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|---|
| Lights
| Verify all exterior lights illuminate and are clean.
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| Check headlights function on high and low beam.
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| Verify reflectors are clean, unbroken and of proper color (red on rear, amber elsewhere).
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| Verify running lights are clean and unbroken.
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| Steering gear
| Inspect for any missing or loose fasteners, power steering fluid leaks and damage to power steering hoses.
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| Steering linkage
| Verify connecting links, arms and rods are not worn or cracked.
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| Verify joints, sockets and boot seals are not worn or loose.
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| Verify cotter keys, nuts and bolts are not loose or missing.
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| Tow hooks
| Inspect front and rear tow hooks for damage or loose mounting. This is particularly important on vehicles that use them frequently.
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| Front suspension
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|---|
| Springs
| Inspect for missing, broken or shifted leaves, or leaves that may be in contact with (or nearly contacting) a tire, rim, brake drum, frame or body component.
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| Note: Never apply grease to spring pads.
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| Spring mounts
| Make sure there the following items are properly tightened and that there are no cracks, breaks, wear, damage to spring hangers, bolts, bushings, axle mounting bolts, and nuts.
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| Shock absorbers
| Inspect for any cracks, leaks, or missing or broken bolts or bushings.
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| Front brakes
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|---|
| Hoses
| Inspect for cracked, worn or frayed hoses, and that all couplings are secure.
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| Brake chambers
| Verify that there are no cracks or dents, and that the chambers are securely mounted.
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| Slack adjusters
| Inspect for broken, loose or missing parts.
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| Note: The angle between the push rod and adjuster arm should be approximately 90 degrees when the brakes are applied. When pulled by hand, the push rod should not move more than approximately
1 in (2.5 cm).
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| Drums
| Verify that there are no cracks, dents, holes, and no loose or missing bolts and that the brake linings are not worn, dangerously thin or contaminated by lubricant.
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| Front wheels
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|---|
| Rims
| Inspect for damaged or bent rims. They should not have welding repairs, and there should be no rust trails, which indicate it is loose on the wheel.
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| Lug nuts
| Verify all lug nuts are present and not loose (look for rust trails around the lug nuts). There should be no cracks radiating from the lug bolt holes or distortion of the bolt holes.
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| Hub oil seals
| Inspect wheel hub oil seal for leaks and, if sight glass if present, verify the oil level is adequate.
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| Oil-lubricated front wheel bearings
| Inspect for proper lubrication level if the hubcap has a transparent window. If the hubcap does not have a transparent window, remove the rubber fill-plug and inspect for proper level.
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| Fuel area
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|---|
| Fuel tank(s)
| Verify the tank(s) and cap(s) are secure and that there are no leaks from the tank(s).
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| Leaks
| Inspect for leaks from the tank(s).
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| Diesel Exhaust Fluid (DEF) area
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|---|
| DEF tanks
| Verify the tanks and caps are secure and that there are no leaks from the tanks.
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| Leaks
| Inspect for leaks from the tanks.
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| Underbody
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|---|
| Driveshaft
| Verify that the driveshaft is not bent or cracked and that all driveshaft couplings are secure.
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| Exhaust system
| Verify that the visible outside parts are securely mounted and that there are no cracks, holes or severe dents.
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| Frame
| Inspect for cracks or bends in longitudinal frame members. Verify there are no loose, cracked, bent, broken or missing crossmembers or crossmember fasteners.
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| Rear of vehicle
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|---|
| Air hoses and electrical lines
| Verify there are no cuts, cracks, chafing or wear on the air hoses and electrical line insulation. Listen for audible air leaks.
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| Verify air and electrical lines are not tangled, crimped or pinched or being dragged against any truck parts. None of the air or electrical line should be spliced or taped.
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| Inspect for corrosion on pins and in electrical sockets to verify continuity and reduced heat build-up potential.
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| Deck plate
| Verify the deck plate is clean, bolted securely to the frame and is clear of loose objects.
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| Turns signals, brake lights and flashers
| Verify that both brake lights illuminate when the pedal is applied, each signal flashes and that the four-way flashers work properly.
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| Lights and reflectors
| Verify all exterior lights illuminate and are clean.
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| Verify reflectors are clean, unbroken and of proper color (red on rear, amber elsewhere).
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| Verify running lights are clean and unbroken.
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| Note: Inspect rear running lights separately from signal, flasher and brake lights.
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| Tractor-coupling system
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|---|
| Mounting bolts
| Inspect for loose or missing mounting brackets, clamps, bolts or nuts. Verify solid attachment of both fifth wheel and the slide mounting.
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| Platform
| Inspect for cracks or breaks in the platform structure.
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| Safety latch
| Verify engagement of the safety latch.
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| Release arm
| Verify the safety latch is in the engaged position, and that any safety latch is in place.
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| Kingpin and apron
| Verify the kingpin is not bent or worn, the apron lies flat on the fifth-wheel skid plate and that the visible part of the apron is not bent, worn, cracked or broken.
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| Rear suspension
|
|---|
| Springs (if equipped)
| Inspect for missing, broken or shifted leaves, or leaves that may be in contact with (or nearly contacting) a tire, rim, brake drum, frame or body component.
|
| Spring mounts (if equipped)
| Inspect for any cracked or broken spring hangers; broken missing or loose bolts; missing or damaged bushings; broken, loose or missing axle mounting parts.
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| Torsion arm and shock absorbers
| Verify torsion arm is not cracked, broken or missing.
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| Inspect the shock absorber for cracks or leaks. There should be no missing or broken mounting bolts or worn bushings.
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| Air suspension (if equipped)
| Inspect for missing, broken or leaking components.
Inspect for any cracked, broken or loose bolts; missing or damaged bushings; broken, loose or missing axle mounting parts.
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| Rear brakes
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|---|
| Hoses
| Inspect for cracked, worn or frayed hoses, and that all couplings are secure.
|
| Brake chambers
| Verify that there are no cracks or dents, and that the chambers are securely mounted.
|
| Slack adjusters
| Inspect for broken, loose or missing parts.
|
| Note: The angle between the push rod and adjuster arm should be approximately 90 degrees when the brakes are applied. When pulled by hand, the push rod should not move more than approximately
1 in (2.5 cm).
|
| Drums
| Verify that there are no cracks, dents, holes, and no loose or missing bolts and that the brake linings are not worn, dangerously thin or contaminated by lubricant.
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| Rear wheels
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|---|
| Spacers
| Check for even separation of dual wheels, and that the tires are not touching each other.
|
| Rims
| Inspect for damaged or bent rims. They should not have welding repairs, and there should be no rust trails, which indicate it is loose on the wheel.
|
| Lug nuts
| Verify all lug nuts are present and not loose (look for rust trails around the lug nuts). There should be no cracks radiating from the lug bolt holes or distortion of the bolt holes.
|
Trailer
If you are pulling a trailer, perform an inspection of the trailer similar to that of the tractor. The inspection should follow trailer manufacturer recommendations and should include at a minimum: general condition, landing gear, doors, sides, lights, reflectors, suspension, brakes, tires, wheels, cargo placement, stability and tie-downs.
Transmission
WARNING:
If the unit starts in gear and/or the neutral start switch is not functioning correctly, the vehicle may inadvertently move which could result in property damage, personal injury or death. |
Regularly inspect the transmission's neutral start switch. The engine should only start in neutral (N) or park (P) (if equipped with a park position).
Inspect the transmission fluid level and shift linkage for proper operation.