Detailed Inspection Procedures
Follow these specialized procedures when inspecting the chassis of your trailer or semi-trailer. Adapt the procedures based on your specific chassis type and configuration.
Frame Rail Inspection
- Position chassis on level surface with adequate lighting
- Clean frame rails to remove dirt and debris for better visibility
- Visually inspect along the entire length of both frame rails
- Look for hairline cracks at high-stress areas (coupler, suspension mounts)
- Check for web crippling at suspension mounting locations
- Use straight edge to check for frame rail bending or deformation
Kingpin Measurement
- Use approved kingpin gauge to check for wear
- Clean kingpin thoroughly before measurement
- Apply gauge per manufacturer's instructions
- Check upper coupler plate for flatness and damage
- Verify all kingpin mounting fasteners are secure
- Inspect for cracks radiating from kingpin mounting area
Crossmember Inspection
- Inspect all crossmembers for deformation and damage
- Pay special attention to crossmember-to-rail connections
- Check for missing or sheared fasteners at connection points
- Verify gussets are properly attached without cracks
- Look for evidence of impact damage or repairs
- Check for rust perforation and structural weakening
Suspension Mount Inspection
- Examine suspension hangers for cracks and deformation
- Check for frame cracking at suspension attachment points
- Verify all fasteners are present and properly torqued
- Look for elongated holes or mounting point damage
- Inspect reinforcement plates for separation from frame
- Check alignment of suspension components
Top 5 FAQs
- What is included in chassis inspection? Frame structure, coupler, landing gear, suspension, brakes, axles, fasteners, and undercarriage.
- What is the standard for inspection? DOT/FMCSA guidelines for trailers and semi-trailers.
- Who should perform it? Fleet inspectors, maintenance technicians, or trained operators.
- Can I use it digitally? Yes, use the FleetRabbit app to perform and document chassis inspections.
- How often should it be done? Weekly or monthly depending on usage, weight, and road conditions.