Guides
Guides for repair shops
All pages in this section
49 CFR 396 Explained for Repair Shops
A plain guide to 49 CFR Part 396 for diesel and truck repair shops: maintenance records, DVIRs, roadside out of service repairs, annual inspections, inspector and brake inspector rules, and Appendix A.
After-Hours Rates for Mobile Mechanics
How mobile diesel mechanics set after-hours, weekend and holiday rates, what federal overtime law requires for employees, and how to bill after-hours work so fleets accept it.
Average Diesel Shop Labor Rate
There is no official national average diesel shop labor rate. Here is what official wage data shows and how to build a labor rate from your own costs.
DOT Annual Inspection Checklist (Appendix A to Part 396)
A practical DOT annual inspection checklist organized by the 15 areas of Appendix A to 49 CFR Part 396, with the reject points shops most often check.
DVIR Requirements for Repair Shops
What 49 CFR 396.11 and 396.13 require on driver vehicle inspection reports, and what a repair shop must do when it repairs and certifies DVIR defects.
Flat Rate vs Actual Hours in Diesel Repair
How diesel and truck repair shops decide between billing flat rate and billing actual hours, with the pros, cons, examples and a mixed approach many shops use.
Fleet Maintenance Contract Pricing
The main ways truck repair shops price fleet maintenance contracts, including time and materials, fixed PM pricing and per-unit monthly plans, and how to set prices that stay profitable.
How Long to Keep Truck Maintenance Records
The federal retention periods for truck maintenance records, DVIRs, annual inspection reports, roadside inspection reports and inspector qualifications, in one table.
How Much Should I Charge as a Mobile Mechanic? Build Your Rates From Your Costs
How a mobile diesel or truck mechanic should set an hourly rate, service call fee, mileage, after-hours premium and parts markup from real costs, with a worked example.
How to Calculate Effective Labor Rate for a Truck Repair Shop
Step by step: calculate effective labor rate (labor sales divided by hours billed), split it by customer type, find where the gap to your posted rate comes from, and fix it.
How to Calculate a Shop Labor Rate for a Diesel or Truck Repair Shop
A step by step method to calculate a diesel shop labor rate from labor cost, overhead, target profit, and billable hours sold, with a worked example, separate mobile and after hours rates, and common mistakes.
How to Certify DVIR Repairs (With Sample Wording)
How a repair shop or fleet technician certifies driver vehicle inspection report repairs under 49 CFR 396.11, with sample wording, a checklist and common mistakes.
How to Choose Diesel Repair Shop Software
A buyer checklist for diesel, truck and heavy-equipment repair shops choosing shop management software: what to write down first, the questions to ask, how to test on a real job and what to get in writing.
How to Dispatch Mobile Diesel Technicians
How to dispatch mobile diesel and heavy-equipment technicians: capture the call, set assignment rules, offer jobs, handle no-accepts, keep customers updated, and measure dispatch without becoming a switchboard.
How to Do a DOT Annual Inspection, Step by Step
A step by step workflow for performing a DOT annual (periodic) inspection on a truck or trailer under 49 CFR 396.17, from intake to report, decal and records.
How to Get Fleet Accounts for Your Truck Repair Business
A step-by-step guide for diesel shops and mobile mechanics on finding fleet customers, making first contact, earning the first job and turning it into a steady account.
How to Handle Net 30 Terms With Fleet Customers
How a truck repair shop should decide who gets net 30 terms, write a credit policy, invoice correctly, track aging, follow up, and handle late payers and government fleets.
How to Invoice Fleet Customers So You Get Paid Faster
What a fleet invoice needs, how to send it, and how to avoid the documentation gaps that slow fleet approvals and payments for truck repair shops.
How to Manage Warranty Claims in a Heavy-Duty Repair Shop
How diesel, truck and heavy-equipment shops handle warranty work: checking coverage, documenting the failure, getting authorization, tracking parts and cores, submitting claims and following up on payment.
How to Measure Billable Hours in a Truck Repair Shop
A step-by-step way for diesel and truck repair shops to measure billable hours, compare them with paid hours and find the labor time that never reaches an invoice.
How to Move Off Spreadsheets in a Truck Shop
A step-by-step plan for truck, diesel and heavy-equipment repair shops moving from spreadsheets, paper and texts to shop management software: signs it is time, cleaning data, importing, running both, and training.
How to Price Mobile Mechanic Jobs
A practical method for pricing mobile diesel and truck repair jobs: labor, service call charges, travel, parts markup, after-hours rates, estimates and approvals.
How to Quote Emergency Roadside Truck Repair
How mobile diesel and roadside repair businesses can quote emergency truck repairs: what to ask on the call, how to price travel and after-hours work, and how to get approval and payment before rolling.
How to Reduce Technician Paperwork in a Diesel Shop
Practical ways to cut technician paperwork in diesel, truck and heavy-equipment repair: capture once, use photos, write repair lines from shorthand, standard forms, and let the office review instead of retype.
How to Reduce Truck Downtime for Fleet Customers
Practical ways truck repair shops and mobile mechanics can reduce downtime for fleet customers, from PM scheduling and defect follow-up to faster diagnosis, parts planning and communication.
How to Run a PM Program for a Fleet
How a repair shop or fleet sets up a preventive maintenance program: unit records, intervals, checklists, scheduling, defect follow-up, and the records 49 CFR 396.3 requires.
How to Run a Reefer Repair Business
How to run a refrigerated trailer and truck unit (reefer) repair business: refrigerant certification, services, mobile versus shop work, urgency, records, pricing, fleet accounts and software.
How to Send Repair Estimates Customers Approve Quickly
How truck and diesel repair shops can write and send estimates that fleet managers and owner-operators approve fast, with clear lines, photos, options and recorded approval.
How to Set Parts Markup for a Diesel Repair Shop
A practical method for diesel and heavy-duty repair shops to set parts markup: markup versus margin, building a sliding matrix, fleet cost-plus terms, cores and checking results.
How to Set Up a Mobile Service Truck for Diesel Repair
How to plan, equip and stock a mobile diesel service truck, including the federal rules on commercial motor vehicles and materials of trade that can apply to it.
How to Start a Mobile Diesel Mechanic Business
A practical plan to start a mobile diesel mechanic business: structure, EIN, licenses, insurance, service truck, pricing, first fleet customers and the systems to run it.
How to Start a Mobile Truck Tire Service Business
A practical guide to starting a mobile commercial truck tire service: business setup, the service truck, wheel safety rules, tread depth standards, pricing road calls, fleet accounts and the software to run it.
How to Start a Mobile Truck Repair Business
A step-by-step guide to starting a mobile truck repair business: market, legal setup, service truck, insurance, pricing, fleet customers, and the systems to run it.
How to Sync a Repair Shop with QuickBooks Online
How truck, diesel and heavy-equipment repair shops connect shop software to QuickBooks Online: what syncs, one-way versus two-way, matching customers and items, handling errors, and a month-end checklist.
How to Win Fleet Maintenance Contracts
A practical guide for truck repair shops and mobile mechanics on finding, bidding for and keeping fleet maintenance contracts, including SAM.gov registration for federal work.
How to Write a Repair Line
How technicians and service writers can write clear repair lines using complaint, cause and correction, with examples, so customers approve faster and fleets have usable records.
Mobile Mechanic Business Software
A checklist for mobile diesel and heavy-equipment mechanics choosing business software: calls, dispatch, technician phones, repair lines, photos, inspections, payments at the truck, service truck parts and accounting.
Mobile Mechanic Licensing
What licenses, registrations and qualifications a mobile diesel mechanic may need, which come from federal rules and which vary by state and city, and how to check your own requirements.
PM Service Cost for a Semi-Truck
What goes into the price of a semi-truck PM service, why quotes vary so much, and how shops and fleets can compare PM prices fairly without relying on made-up averages.
QuickBooks vs Shop Management Software for a Truck Shop
Can a truck, diesel or heavy-equipment repair shop run on QuickBooks alone? What accounting software does well, what shop management software adds, and how the two work together.
Insurance for Mobile Mechanics and Truck Repair Shops
An overview of the insurance types mobile diesel mechanics and truck repair shops commonly consider, what federal sources say employers must carry, and questions to ask an agent.
Semi-Truck PM Service Checklist
A practical semi-truck preventive maintenance checklist organized by system, with the federal standards for brakes, tires and records that technicians should measure against.
How Much Does Truck Shop Management Software Cost?
What drives the cost of shop management software for truck, diesel and heavy-equipment repair shops: pricing models, extra fees, payment processing, switching costs and how to compare total cost.
Technician Efficiency vs Productivity
The difference between technician efficiency and technician productivity in a diesel or truck repair shop, with formulas, worked examples and what to do when each is low.
Truck Repair Invoice
A checklist of what a truck or diesel repair invoice should include, from vehicle and customer details to 3C repair lines, parts, labor, fees, approvals and payment terms.
What Is Included in a Semi-Truck PM Service?
What a semi-truck preventive maintenance service usually includes, how A, B and C service levels differ, and what federal rules say about inspection and records.
Who Can Perform a DOT Annual Inspection?
The federal qualification rules for annual inspectors under 49 CFR 396.19, what records to keep, and how a repair shop can offer annual inspections to fleets.
Why Do Repair Shops Charge for Shop Supplies?
Why diesel and truck repair shops add a shop supplies charge, what it covers, common ways to calculate it, and how to show it on an invoice so customers and fleets accept it.
Questions
Are the guides legal advice?
No. They explain the rules in plain words and link to the official text.
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