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Fleet Preventive Maintenance & DOT Inspections

CALL  (901) 258-1528

to schedule fleet inspections or establish a recurring maintenance agreement.

Diesel Doc provides certified on-site annual DOT inspections and scheduled commercial fleet preventive maintenance (PM) across North Mississippi, Greater Memphis, and Eastern Arkansas. Qualified inspectors travel directly to your terminal, drop yard, distribution facility, or job site to certify Class 4–8 tractors, dry vans, reefers, flatbeds, and vocational vehicles under 49 CFR Part 396. We keep your commercial fleet FMCSA-compliant, protect your CSA safety scores, and eliminate terminal downtime without trips to a retail repair shop.

All Services

What’s Covered

What Does Diesel Doc’s Fleet Preventive Maintenance & DOT Inspection Service Cover?

Diesel Doc delivers turnkey mobile fleet compliance, executing federally mandated 49 CFR 396.17 periodic inspections and customized mileage- or engine-hour-based preventive maintenance directly in your yard. Every scheduled visit includes documented multi-point evaluations, certified compliance paperwork, digital maintenance records, and minor point-of-service calibrations to prevent vehicle out-of-service (OOS) orders.

MOBILE FLEET CAPABILITY OVERVIEW

ANNUAL DOT PERIODIC INSPECTIONS

  • 49 CFR 396.17 / Appendix A compliance
  • Certified 396.19 qualified inspectors
  • Tractors, trailers, reefers, chassis
  • Official inspection reports & decals
  • 14-month compliance documentation

STRUCTURED PREVENTIVE MAINTENANCE (PM)

  • Structured PM-A, PM-B, & PM-C service
  • Lube, oil, filter & fluid management
  • Foundation brake stroke calibration
  • Electrical, cooling, & battery audits
  • On-site service at carrier facilities

When inspections uncover active mechanical defects, such as air brake chamber leaks, compromised gladhands, damaged roll-up doors, or structural frame fractures, repairs can be authorized and completed on-site via our Mobile Semi-Truck & Trailer Repair Division.

Set Up a Maintenance Plan, Call
 (901) 258-1528

DOT INSPECTION

What a 49 CFR 396.17 DOT Annual Inspection Covers

A DOT annual inspection is a mandatory 12-month federal safety review evaluating commercial motor vehicles against the standards defined in Appendix A to Part 396. Executed by qualified inspectors meeting 49 CFR 396.19 standards, each tractor, semi-trailer, and converter dolly in a combination requires independent certification.

Foundation Brake Systems

Measures pushrod stroke travel, evaluates automatic slack adjusters, inspects brake lining thickness (minimum 1/4″ for drum, 1/8″ for disc), tests low-pressure warning buzzers, checks tractor protection valves, and tests for pneumatic pressure loss under full application.

Coupling Devices & Fifth Wheels

Inspects fifth-wheel top plates, locking jaws, mounting brackets, slider mechanisms, pintle hooks, drawbar eyes, and safety chains for excessive play, cracks, or structural fatigue.

Suspension & Chassis Integrity

Examines leaf springs for shifted or cracked leaves, air spring bags for leaks or dry-rot, torque rods, U-bolts, walking beams, and chassis frame rails for cracks or unauthorized welds.

Steering Mechanisms

Checks steering gear boxes, pitman arms, drag links, tie rod ends, and steering column lash for excessive free play or hydraulic fluid leaks.

Vehicle Lighting & Reflective Devices

Verifies operational clearance, marker, identification, turn, and brake lamps, along with retroreflective DOT-C2 conspicuity tape.

Exhaust & Aftertreatment Placement

Checks for exhaust leaks discharging beneath the sleeper berth or passenger cab, loose heat shielding, and secure mounting of DPF/SCR canisters.

Wheels, Rims & Fasteners

Inspects wheel rims for cracks, elongated stud holes, spoke damage, and loose or missing lug nuts.

Tire Physical & Tread Evaluation

Checks tread depth across all positions (minimum 4/32″ steer tires, 2/32″ non-steer tires), checks for exposed ply fabric, sidewall cuts, ply separation, and dual-wheel contact. (Note: Non-compliant tires are documented on the inspection report for fleet remediation).

Fuel Supply & Delivery Systems

Inspects fuel tanks, fill caps, venting, and supply lines for leaks, secure tank retention bands, and proper impact protection.

Windshield Glazing, Wipers & Cab Safety

Inspects windshield glass for cracks within the acute viewing area, operational wiper arms and fluid sprayers, rear-view mirrors, horn, and charged on-board fire extinguishers and emergency triangle kits.

PM Levels

Structured Mobile Preventive Maintenance (PM) Levels

Diesel Doc designs proactive fleet preventive maintenance programs based on operational duty cycles, mileage intervals, or cumulative engine hours to prevent on-road failures

Preventative Maintenance Levels Chart

Scheduled PM VS Urgent

Scheduled Compliance Service vs. Urgent Repair Dispatch

Diesel Doc maintains operational separation between compliance maintenance and emergency breakdown dispatch, giving commercial fleets a single vendor for both disciplines.

DIESEL DOC FLEET SERVICE ARCHITECTURE

SCHEDULED COMPLIANCE & MAINTENANCE

  • Annual DOT 396.17 certifications
  • Scheduled PM-A, PM-B, & PM-C lube
  • Terminal yard audits & pre-trip checks
  • Document retention for FMCSA reviews
  • Coordinated via Fleet Maintenance Hub

RAPID REPAIR & EMERGENCY DISPATCH

  • Urgent roadside breakdown response
  • Real-time diagnostic fault clearing
  • Active air brake, starter, & fuel fixes
  • Emergency Reefer & Cold-Chain repair
  • Dispatched 24/7 via Roadside Hub

Fleet Maintenance

Diesel Doc Fleet Maintenance Process

Diesel Doc follows a five-step lifecycle to manage fleet regulatory compliance and vehicle uptime.

.01

Fleet Schedule Architecture

We evaluate your fleet composition, operating profile, and upcoming inspection expirations to establish recurring on-site service windows (evenings, weekends, or scheduled yard layovers).

.02

On-Site Mobile Deployment

Certified mobile mechanics arrive directly at your yard, warehouse, or logistics terminal with all necessary oil extraction equipment, filters, test instruments, and compliance forms.

.03

Standardized Inspection Execution

Technicians conduct the FMCSA Appendix A inspection or PM tier following standardized, audit-tested digital checklists.

.04

Certified Compliance Documentation

Passed units receive an official FMCSA-compliant annual inspection decal applied directly to the power unit or trailer chassis, alongside a digital and physical report retained for carrier files.

.05

Automated Expiration Tracking

Diesel Doc logs completed inspection dates and service intervals into our fleet tracking system, alerting fleet managers 30 days before the 12-month certification expires.

WHERE WE WORK

Where Does Diesel Doc Provide Mobile Fleet Maintenance & DOT Inspections?

Diesel Doc deploys mobile fleet service units across the tri-state freight logistics hub, covering North Mississippi, Greater Memphis, and Eastern Arkansas.

Mississippi

North Mississippi

I-55 & I-22 / US-78

Cities

Southaven, Horn Lake, Walls, Hernando, Olive Branch, Coldwater, Senatobia, Holly Springs, Potts Camp, Oxford, New Albany, Batesville

Counties

DeSoto, Marshall, Tate, Tunica, Panola, Lafayette, Union

Tennessee

Greater Memphis

I-40, I-55 & I-240 Loop
I-269 Outer Beltway

Cities

Memphis, Bartlett, Germantown, Collierville, Arlington, Oakland

Counties

Shelby, Tipton, Fayette

Arkansas

West Memphis / Eastern Arkansas

I-40, I-55 & I-555

Cities

West Memphis, Marion, Jonesboro

Counties

Crittenden, Craighead

North Mississippi Corridor

Serving industrial distribution parks, commercial carrier yards, and private terminals along Interstate 55 and Interstate 22/US-78. Service areas include Southaven, Horn Lake, Walls, Hernando, Olive Branch, Coldwater, Senatobia, Holly Springs, Potts Camp, Oxford, New Albany, and Batesville across DeSoto, Marshall, Tate, Tunica, Panola, Lafayette, and Union counties.

Greater Memphis Metropolitan Distribution Gateway

Providing fleet servicing across terminal yards in the Mid-South freight hub along Interstate 40, Interstate 55, the Interstate 240 beltway, Interstate 269 logistics ring, and the Lamar Avenue (US-78) warehousing corridor. On-site fleet service covers Memphis, Bartlett, Germantown, Collierville, Arlington, and Oakland within Shelby, Tipton, and Fayette counties.

Eastern Arkansas & West Memphis Freight Crossings

On-site mobile fleet coverage for logistics facilities and distribution cross-docks west of the Mississippi River along Interstate 40, Interstate 55, and Interstate 555. Servicing yards in West Memphis, Marion, and Jonesboro across Crittenden and Craighead counties.

WHY DIESEL DOC

Why Choose Diesel Doc for Fleet Maintenance & Compliance?

Diesel Doc replaces the high cost and operational drag of traditional retail shop maintenance with mobile, on-site fleet care.

Zero Transport Labor & Shuttling

Drivers and yard hostlers spend zero hours deadheading equipment back and forth to off-site service facilities or waiting in multi-day shop queues.

FMCSA Audit-Ready Records

Every service generates detailed, standardized documentation designed to satisfy state highway patrol audits, DOT compliance reviews, and insurance safety requirements

Comprehensive Multi-Asset Capabilities

We inspect and service Class 4–8 tractors, box trucks, flatbeds, tankers, refrigerated trailers, and terminal yard hostlers during a single site visit.

Predictable Standing Rate Structures

Fleet accounts benefit from standardized, transparent labor pricing, volume parts agreements, and guaranteed preventive maintenance intervals.

Our Certifications

  • DOT Certified

  • ASE Medium-Heavy Truck Certifications (Series T)

  • OEM Certification

  • EPA Certification

FAQ

Frequently Asked Questions

A 49 CFR 396.17 DOT inspection covers 13 core systems: service brakes, coupling devices, exhaust system, frame components, fuel system, lighting, emergency equipment, steering mechanisms, suspensions, tires, wheels/rims, windshield wipers, and trailer bodies.

Federal law mandates that every commercial motor vehicle operating in interstate commerce with a GVWR/GCWR exceeding 10,001 pounds—including every tractor, semi-trailer, and converter dolly—undergo a certified periodic inspection at least once every 12 months.

Yes. Diesel Doc conducts all inspections and preventive maintenance on-site at your terminal, drop yard, or warehouse, meaning equipment never has to leave active service or burn driver hours traveling to a shop.

Under 49 CFR 396.19, an inspector must understand the Part 396 inspection criteria, have specialized training or at least one year of mechanical experience evaluating commercial motor vehicles, and be certified to assess brake and safety compliance. Diesel Doc inspectors meet all federal qualification standards.

Under FMCSA regulations, the carrier must retain the original or a certified copy of the annual inspection report for at least 14 months from the date of execution, and a copy or official inspection decal must be maintained on the vehicle itself.

Yes. Under federal rules, each individual unit in a commercial combination—the power unit (tractor), the primary semi-trailer, and any auxiliary trailer—must maintain its own valid annual inspection report and decal.

A DOT inspection is a regulatory safety pass/fail audit mandated by federal law. Preventive maintenance is proactive mechanical servicing (fluid changes, filter replacements, chassis lubrication, component adjustments) designed to prevent mechanical breakdowns and extend asset lifespan.

If a mechanical defect is detected (e.g., an air leak, worn brake lining, or inoperable lamp), Diesel Doc can often complete the required mechanical repair during the same yard visit through our mobile repair service, bringing the unit into full compliance so it can pass inspection immediately.

Yes. We establish tailored maintenance schedules based on each fleet’s operational telemetry—tracking engine hours for local delivery/yard spotters or mileage for long-haul tractors.

Yes. We deliver the same on-site inspection compliance, upfront pricing, and documentation to independent owner-operators as we do to enterprise multi-unit distribution fleets.

Diesel Doc inspects tire tread depth, casing condition, and inflation pressure to certify DOT compliance per Appendix A. If a tire fails federal safety thresholds, we document the defect on the report for fleet tire vendors or tire replacement.

Pricing is determined by fleet volume, vehicle configurations, and the required PM level (A, B, or C). We provide transparent upfront estimates and offer standing rate contracts for ongoing fleet accounts

Interested in scheduling fleet maintenance?

Call now. We will discuss you needs for maintaining your fleet.