Peterbilt Trailer Inspection and Maintenance Checklist

Trailer Inspection Overview

Proper trailer maintenance is essential for safe and efficient operation with Peterbilt tractors. A well-maintained trailer ensures regulatory compliance, maximizes payload capacity, reduces downtime, and enhances safety for drivers and the public. This comprehensive checklist covers critical inspection points and maintenance procedures for various trailer types commonly used with Peterbilt trucks, including dry vans, refrigerated trailers, flatbeds, tankers, and specialty trailers. Regular inspections following these guidelines will help identify potential issues before they lead to road failures, costly repairs, or safety violations.

Trailer Brake System Inspection

Verify these critical brake system components for safe trailer operation.

Air Brake System

Inspect gladhand connections for damage
Check air hoses for cracks, chafing, or leaks
Verify proper hose routing and support
Test for air leaks at all connections
Check air tank mounting and drain valves
Verify quick-release valves operation
Inspect relay valves for leaks or damage
Check all air line fittings for security

Brake Chambers & Actuators

Inspect brake chambers for damage or corrosion
Check for broken or missing chamber parts
Verify correct chamber size and type
Measure pushrod travel (should not exceed specs)
Check clevis pins and cotter pins
Inspect chamber mounting brackets
Verify chamber orientation is correct
Check for air leaks during application

Slack Adjusters

Inspect automatic slack adjusters for damage
Check for proper adjustment and stroke
Verify slack adjuster mounting is secure
Inspect clevis pins and bushings for wear
Check for proper lubrication at fittings
Verify slack adjuster angle is correct
Test auto-adjustment function (if possible)
Inspect for rust, damage, or wear

Brake Drums & Linings

Inspect brake drums for cracks or heat damage
Check for glazing, grooving, or out-of-round
Measure drum diameter (must not exceed max)
Inspect brake linings for wear (min 1/4" thickness)
Check for oil or grease contamination
Verify linings are securely attached
Inspect for missing or broken parts
Check brake shoe return springs

Trailer Suspension & Running Gear

Verify these critical suspension and running gear components.

Air Suspension System

Inspect air springs for damage or leaks
Check for proper ride height and adjustment
Verify height control valve operation
Inspect air lines for leaks or chafing
Check shock absorbers for leaks or damage
Inspect air suspension mounting brackets
Check suspension dump valve operation
Verify suspension is level when loaded

Spring Suspension System

Inspect leaf springs for cracks or breaks
Check for shifted or missing leaves
Verify spring eye bushings condition
Inspect U-bolts, nuts, and torque
Check equalizers and torque arms
Inspect hanger brackets and mounting
Verify alignment of axles
Check for adequate clearance at all points

Axles

Inspect axle for straightness and alignment
Check for signs of overloading or damage
Verify axle seats firmly in suspension
Inspect camshafts and bushings for wear
Check axle for cracks or defects
Verify proper spacing on multi-axle trailers
Inspect lift axle mechanism (if equipped)
Check alignment with other axles

Wheel Bearings & Hubs

Check for proper lubrication (oil or grease)
Verify oil level in hub caps (oil bath)
Inspect hub caps and seals for leaks
Check for excessive end play or looseness
Inspect for signs of overheating
Verify hub and bearing condition
Check oil/grease quality for contamination
Inspect spindle and axle end for damage

Wheels & Rims

Inspect wheels for cracks or damage
Check for elongated stud holes
Verify proper matching of dual wheels
Check for bent or damaged flanges
Inspect valve stems and extensions
Verify all fasteners are present and tight
Check for rust trails indicating loose nuts
Inspect for proper spacing between duals

Tires

Check tire pressure in all positions
Inspect tread depth (minimum 2/32" or 4/32" steer)
Check for uneven or irregular wear
Inspect for cuts, bulges, or penetrations
Verify proper tire size and rating
Check for matching tires on dual wheels
Inspect for debris between dual tires
Verify valve caps are present

Fifth Wheel & Kingpin

Check kingpin for wear, bends, or damage
Verify kingpin length and diameter
Inspect upper coupler plate for cracks
Check for secure mounting to trailer frame
Inspect for proper lubrication
Verify kingpin is properly engaged
Check for gaps between fifth wheel and plate
Inspect for proper operation of locking mechanism

Landing Gear

Check for proper operation and extension
Inspect mounting brackets for cracks
Verify crank handle security and operation
Inspect for bent or damaged components
Check cross-shaft and gears for damage
Verify proper lubrication of components
Inspect foot pads for damage or excessive wear
Check security of high/low gear operation

Trailer Lighting & Electrical Systems

Verify these critical electrical components for safe trailer operation.

Electrical Connections

Inspect 7-way connector for damage or corrosion
Check electrical cable for abrasions or damage
Verify proper cable routing and support
Test all circuits for continuity
Inspect junction boxes for water intrusion
Check ground connections for corrosion
Verify auxiliary connections (if equipped)
Inspect trailer-mounted electrical components

Lighting Functions

Test all tail lights for proper operation
Verify stop lights illuminate with brake application
Check turn signals (left and right)
Inspect clearance/marker lights
Verify license plate light
Test backup lights (if equipped)
Check all lights for proper brightness
Verify all lenses are intact and clean

Reflectors & Conspicuity

Inspect all reflectors for presence and condition
Check DOT conspicuity tape for damage
Verify proper placement of reflective materials
Inspect side marker reflectors
Check rear impact guard reflective marking
Verify compliance with visibility regulations
Inspect for fading or peeling of reflective material
Check for proper cleaning of reflective surfaces

ABS System

Verify ABS indicator lamp functions properly
Check ABS control module for damage
Inspect wheel speed sensors and wiring
Verify proper sensor gap adjustment
Test ABS system using diagnostic equipment
Check for stored fault codes
Verify proper grounding of ABS components
Inspect valve functionality

Trailer Structure & Body

Verify these structural components for trailer integrity and safety.

Frame & Crossmembers

Inspect main frame rails for cracks or bends
Check crossmembers for damage or missing fasteners
Verify frame is straight and properly aligned
Inspect for corrosion or deterioration
Check gussets and reinforcements
Verify proper frame height and level
Inspect for improper repairs or modifications
Check frame for signs of overloading

Floor & Interior Structure

Inspect floor for damage, holes, or weakness
Check for proper support of floor components
Verify interior lining condition (if applicable)
Inspect load securement tracks or tie-downs
Check for water damage or intrusion
Verify floor rating meets load requirements
Inspect logistic posts or slotted rails
Check interior lighting (if equipped)

Side Walls & Roof

Inspect exterior panels for damage or dents
Check for water leaks or seam separation
Verify roof bows and supports
Inspect for punctures or tears
Check rivets and fasteners for security
Verify corner posts and reinforcements
Inspect roof for structural integrity
Check overall body alignment

Doors & Hardware

Inspect door operation and sealing
Check door hinges and pins for wear
Verify locking mechanisms function properly
Inspect door gaskets and seals
Check door tie-backs and hold-opens
Verify door hardware is secure
Inspect interior door components
Check door adjustment and alignment

Underride Protection

Inspect rear impact guard (ICC bumper)
Check for proper height from ground
Verify secure attachment to frame
Inspect for bends, cracks, or damage
Check side underride protection (if equipped)
Verify compliance with current regulations
Inspect reflective markings on guards
Check for proper repairs if previously damaged

Landing Gear Structure

Inspect landing gear mounting to frame
Check bracing and cross supports
Verify structural integrity of legs
Inspect foot pads and base plates
Check for cracks in mounting components
Verify alignment of landing gear
Inspect for bent or damaged components
Check adequate ground clearance when retracted

Roof & Top Rails

Inspect roof sheet for punctures or damage
Check roof bows and supports
Verify roof seams and overlaps
Inspect top rail for straightness and damage
Check roof radius corners
Verify roof to side wall attachment
Inspect roof for water pooling or drainage issues
Check for signs of impact damage

Tanker Specific Structure

Inspect tank shell for damage or dents
Check tank mounting to frame
Verify bulkhead integrity
Inspect baffles (if accessible)
Check valve connections and piping
Verify manhole covers and gaskets
Inspect tank shell for corrosion
Check pressure relief devices (if applicable)

Specialized Trailer Systems

Verify these specialized systems based on trailer type.

Refrigeration Units

Check refrigeration unit operation
Inspect fuel level and condition
Verify proper temperature settings
Check refrigerant level and pressure
Inspect belts and hoses
Test alarm systems and indicators
Verify proper mounting to trailer
Check data recording systems

Hydraulic Systems

Check hydraulic fluid level and condition
Inspect hoses and connections for leaks
Verify cylinder operation and seals
Test control valves and levers
Check hydraulic pump function
Inspect mounting of hydraulic components
Verify pressure relief valve operation
Check hydraulic reservoir and breather

Liftgates & Ramps

Inspect liftgate platform for damage
Check hydraulic system and cylinders
Verify power unit operation
Test controls and safety features
Inspect mounting to trailer frame
Check chains, cables, and rollers
Verify proper capacity rating is visible
Test full operation cycle

Load Securement Systems

Inspect tie-down anchors and track
Check winches and tensioning devices
Verify strap and chain condition
Inspect cargo bars and bracing systems
Check load locks and dividers
Verify decking systems (if equipped)
Inspect specialty load securement fixtures
Check compliance with FMCSA regulations

Trailer Type-Specific Inspections

Follow these specialized inspection procedures based on trailer type.

Dry Van Trailers

Inspect interior lining for damage
Check scuff liner at floor-wall junction
Verify roof leaks and water damage
Inspect logistic track or E-track system
Check door seals and gaskets
Verify interior height clearance
Inspect load securement points
Check for pest intrusion or damage

Refrigerated Trailers

Check reefer unit operation and temperature
Inspect insulation integrity
Verify door seals and gaskets
Check air chute system and attachments
Inspect floor drains and channels
Test interior temperature monitoring
Verify bulkhead and partition function
Check for moisture or ice buildup

Flatbed Trailers

Inspect deck boards or plates for damage
Check stake pockets and side rails
Verify winch track and load securement points
Inspect headboard integrity
Check sliding winches and operation
Verify coil packages and securement
Inspect rub rails and side protection
Check for twisted or bent frame

Tanker Trailers

Inspect tank shell for damage or leaks
Check valves, gaskets, and seals
Verify dome cover and venting system
Inspect discharge connections
Check baffles and bulkheads (if accessible)
Verify proper placarding and markings
Inspect walkways and guardrails
Check overturn protection structure

Preventive Maintenance Schedule

Follow these maintenance intervals to maximize trailer life and reliability.

Every Trip Inspection

Check all lights and reflectors
Verify air line connections
Inspect tires for damage or inflation
Check brake operation
Verify landing gear operation
Inspect coupling devices
Check doors and securement
Verify load securement

30-Day Maintenance

Lubricate landing gear
Check wheel lug torque
Inspect air system for leaks
Check brake adjustment
Verify suspension components
Inspect gladhands and seals
Check electrical connections
Inspect body and structure

90-Day Maintenance

Check wheel bearing adjustment
Inspect brake lining thickness
Verify hub oil level
Check kingpin and upper coupler
Inspect air valves operation
Verify door hinges and hardware
Check suspension bushings
Inspect frame and crossmembers

Annual Maintenance

Change wheel bearing lubricant
Inspect brake drums and components
Check all air system valves
Verify spring and air suspension
Inspect frame for cracks
Check all electrical wiring
Verify ABS system operation
Complete structural inspection

Documentation & Compliance

Verify these compliance items to ensure regulatory adherence.

Required Documentation

Verify current registration
Check annual inspection documentation
Inspect license plate and mounting
Verify FMCSA compliance documents
Check tire registration information
Inspect VIN and identification plates
Verify any special permits or certificates
Check weight compliance documentation

Required Markings

Verify USDOT number display (if required)
Check company name and information
Inspect GVWR markings
Verify conspicuity tape placement
Check ABS indicator label
Inspect hazardous material placards (if required)
Verify tire information labels
Check rear impact guard certification

Recordkeeping

Maintain maintenance records
Document all repairs and service
Keep inspection reports on file
Track component replacement history
Record all compliance inspections
Maintain accident or damage reports
Keep warranty information
Document load testing (if applicable)

Hazardous Materials (If Applicable)

Verify proper placarding
Check shipping papers and documentation
Inspect container certification
Verify leak-free operation
Check emergency response information
Inspect specialized containment features
Verify hazmat training documentation
Check route restrictions compliance

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