Heavy Duty Journal | Diesel Repair & Fleet Management Hub

BlogWomen in Heavy-Duty Industry

Retaining Women Diesel Technicians: A Proven Culture Guide

Michael Nielsen July 26, 2026

BlogEmissions & Environmental Compliance

Diesel Emissions Tampering Penalties: Costly Federal Risk

July 19, 2026 Blog

BlogTechnician Development & Training

ASE Certification for Heavy Duty Trucks: Complete Study Guide

July 17, 2026 Blog

BlogCompliance & Safety Management

Forklift Training for Diesel Repair Shops: A Complete Guide

July 17, 2026 Blog

Fleet Management & Strategy

BlogFleet Management & Strategy

Fleet Right-Sizing: Complete Guide to Optimizing Vehicle Inventory [2025]

BlogFleet Management & Strategy

Fleet Insurance Costs: 9 Proven Strategies to Cut Premiums

BlogFleet Management & Strategy

Fleet Tire Management: 6 Strategies to Cut Operating Costs

Fleet manager reviewing maintenance analytics on a tablet inside a modern truck service facility while technicians perform preventive maintenance on North American Class 8 semi-trucks to reduce fleet operating costs and improve vehicle uptime.

BlogEditors Pick

Fleet Maintenance Costs: Proven Strategies to Cut 25–30%

Start Your Diesel Career: Entry-Level to Licensed Heavy Duty Mechanic

Ryder Mechanics - Start Your Diesel Career

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Shop Business & Growth

Experienced diesel technician repairing a heavy-duty truck engine inside a modern commercial truck repair shop, illustrating workers' compensation, workplace safety, and risk management in the heavy-duty trucking industry.

Blog Shop Business & Growth

Workers’ Compensation for Truck Repair Shops: Complete Guide

July 12, 2026 No Comments

Used white tool truck with open side display being inspected by two mechanics outside a commercial diesel repair shop.

Blog Shop Business & Growth

How to Buy a Used Tool Truck: What to Look For Before You Commit

June 18, 2026 No Comments

Diagnostics & Technology

Blog Diagnostics & Technology

DEF System Diagnostics: Common SCR Faults and Solutions

Expert guide to DEF system diagnostics covering SCR faults, sensor issues, and proven repair solutions for diesel engines.

November 12, 2025

Blog Diagnostics & Technology

Remote Diesel Diagnostics: Essential Fleet Guide [2025]

Remote diesel diagnostics transforms fleet maintenance from reactive repairs to proactive monitoring. Learn how telematics reduces downtime 30% and cuts towing costs 80%.

November 12, 2025

Editor’s Pick

BlogEditors Pick

Heavy-Duty Repair Shop Layout: Complete Planning Guide

Alternative Fuel & Green TechnologyBlog

Rivian Commercial Van: Specs, Pricing, and What Fleet Managers Need to Know

BlogEditors Pick

7 Common Cummins ISX Problems: Complete Repair Guide

BlogEditors Pick

Fleet Maintenance Costs: Proven Strategies to Cut 25–30%

New Resource

The HDJ Diesel Mechanic Tools Guide

96 professional tools across 9 categories — curated from 15+ years in the trade.

Browse the Tools Guide →

Truck Fault Code Lookup

Decode SPN & FMI codes instantly. Get plain-English explanations, drivability guidance, probable causes, and repair cost estimates.

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Preventative Maintenance

Nov19

In-House vs Outsourced: Fleet Maintenance Costs Analysis

Compare fleet maintenance costs for in-house diesel mechanics vs outsourced service providers. Break-even analysis, hidden costs, and ROI calculations for fleets of all sizes.

Nov13

Diesel Fuel System Maintenance: Complete Guide to Injector Care & Filter Service

Master diesel fuel system maintenance with expert guidance on injector care, filter replacement, contamination prevention, and scheduling. Protect your investment.

Free Download

Diesel Maintenance Checklist

2026 Edition

Complete PM schedule from daily pre-trip to annual DOT inspection. Built for real shops.

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6Service Intervals

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AI & Fleet Technology

AI & Fleet Technology

How to Evaluate AI Fleet Management Software: Complete Guide

January 31, 2026 No Comments

Fleet safety inspector conducting a commercial truck safety inspection with a checklist beside a Class 8 semi-truck at a fleet terminal, representing driver safety, compliance, and risk management.

Shop Operations & Workflow

How to Win a Truck Warranty Dispute: Documentation Guide

Michael Nielsen December 17, 2025 Blog Shop Operations & Workflow

6 Labor Efficiency KPIs Every Fleet Maintenance Shop Must Track

Michael Nielsen November 13, 2025 Blog Shop Operations & Workflow

Blog Owner Operator

Critical Diesel Engine Warning Signs to Never Ignore

Michael Nielsen November 19, 2025

Recognize diesel engine warning signs early to prevent costly repairs. Learn critical symptoms from sounds, performance issues, and visual indicators fleet managers must know.

Tools & Equipment Reviews

Blog Electrical & Electronic Systems

Heavy Duty Battery Load Tester Guide: Top Fleet Picks for 2025

Michael Nielsen November 16, 2025

Compare the best heavy duty battery load testers for 2025. Covers conductance, carbon pile, and hybrid analyzers from Fluke, Midtronics, Launch, and Foxwell.

Customer Service & Marketing

Realistic interior of a well-established heavy-duty truck repair shop with multiple service bays, experienced diesel mechanics servicing pickup trucks, medium-duty commercial trucks, and Class 8 semi-trucks using professional diagnostic equipment in a clean, modern fleet maintenance facility.

BlogCustomer Service & Marketing

Get Your Truck Repair Shop Featured in Trade Press

Table of Contents Add a header to begin generating the table of contents By Michael ...

Diesel technician servicing a semi-truck at a commercial fleet yard, representing heavy-duty industry expertise and guest posting authority for trade publications.

BlogCustomer Service & Marketing

Guest Posting for Heavy-Duty Industries: Which Sectors Benefit and How to Get Started

Discover which heavy-duty industries benefit most from guest posting — from trucking and construction to mining, agriculture, and renewable energy. Learn how to build authority, ...

Diesel Fuel Cooler Leak: Symptoms, Diagnosis & Replacement

November 12, 2025 No Comments Blog Fuel Systems & Injection Technology

Diesel fuel cooler failures cause catastrophic engine damage. Learn warning signs, diagnosis methods, repair costs, and prevention strategies.

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HEAVY DUTY JOURNAL

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Cybersecurity & Freight Fraud Defense

Shadowed figure near an open freight trailer in a dimly lit trucking yard representing cargo theft and fleet security risks.

Cargo Theft in Trucking: How It Happens, What It Costs, and How to Protect Your Freight

May 29, 2026 No Comments

Cargo theft in trucking costs the industry hundreds of millions annually. Learn how thieves operate, what they target, and how to protect your freight.

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96 professional tools across 9 categories — curated from 15+ years in the trade.

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Start Your Diesel Career: Entry-Level to Licensed Heavy Duty Mechanic

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