Port Arthur · Beaumont· The Golden Triangle
Diesel mechanic and
semi truck repair
on the road or in the shop.
A shop on FM 365 with a gated yard, and a service truck that covers the Golden Triangle, the I-10 corridor west to Baytown, and east into Lake Charles. Run by a family that maintains its own fleet in the same shop.
Truck down now
Get somebody rolling
Roadside and mobile: no-starts, air leaks, flats and blowouts, dead batteries, fault codes and derates, fuel delivery. Call and have the make, model, and where the truck is sitting.
(409) 460-5040What the service truck can do →Running a fleet
Evaluating a shop
PM programs and scheduling, DOT inspections by a qualified inspector on staff, drop-and-go trailer service, and a gated yard with cameras for staging and overflow. Multi-truck work that does not tie up your drivers.
Fleet servicesRequest a quote →Monday – Friday 8:00am – 5:00pm·Saturday 8:00am – 12:00pm·Sunday closed
After hours is by call and not guaranteed. We are not a 24/7 line and we will not pretend to be.
What we do
Mobile Diesel Mechanic
A technician and a stocked service truck come to the truck, anywhere in a 75-mile ring around Port Arthur.
Semi Truck Repair
The work a service truck cannot do on a shoulder — and a gated yard to leave it in.
Mobile Truck Diagnostics
Fault codes, live data, and electrical troubleshooting read at the truck, not at the shop.
DOT Inspection
Annual federal periodic inspections, run in the shop by a qualified inspector.
PM Service
Scheduled preventive maintenance set to how your trucks actually run, not to a number off a chart.
Semi Truck Tire Repair
Roadside flats, blowouts, and replacements — steer, drive, and trailer positions.
DPF Cleaning
Filter service plus the diagnosis of why it plugged in the first place.
Forced Regen
Get the truck out of derate — then find out why it stopped regenerating on its own.
Semi-Trailer Repair
Commercial semi-trailers — brakes, air, running gear, structure, and welding.
Why us
We are a trucking company that fixes trucks
We run a 9-truck fleet of our own. MDJ Services LLC — same family, same yard, same gate — keeps 9 trucks and 12 trailers moving flatbed, step deck, and end dump freight on I-10. Every one of them is maintained right here, by this crew, in these bays.
Where we go
75 miles from the yard
The service truck runs out of 1050 FM 365 in Port Arthur. That reaches the whole Golden Triangle in under forty minutes, the I-10 corridor west through Winnie to Mont Belvieu and Baytown, and east across the Sabine into Sulphur and Lake Charles.
The Golden Triangle
Home turf. Port Arthur, Beaumont, Orange, and the Mid-County towns between them — most of it inside a half-hour of the yard.
Port Arthur, Nederland, Port Neches, Groves, Beaumont, Orange, Vidor
I-10 West Corridor
The run west from the yard toward Houston — Winnie, Mont Belvieu, and the Baytown industrial corridor.
Southwest Louisiana
Across the Sabine on I-10 — Sulphur and Lake Charles, inside an hour of the yard.
1050 FM 365, Port Arthur, TX 77640
Straight answers
Do you do mobile repairs, or do I have to bring the truck in?
Both. The service truck works a 75-mile radius out of Port Arthur for roadside and on-site repairs, and the shop handles the work that needs a bay — clutch, driveline, DPF service, welding, and DOT inspections.
Are you open 24/7?
No. Monday – Friday 8:00am – 5:00pm, Saturday 8:00am – 12:00pm, closed Sunday. After hours we answer by call and it is not guaranteed — we will tell you quickly whether we can roll rather than leave you waiting.
How far do you travel?
Seventy-five miles and change from 1050 FM 365 in Port Arthur — the whole Golden Triangle, west on I-10 through Winnie to Baytown and Mont Belvieu, and east to Sulphur and Lake Charles.
Do you work on RVs, travel trailers, or buses?
No. We are a commercial truck and semi-trailer shop. For RVs, travel trailers, boat trailers, or buses you want a shop set up for them.
Do you rebuild engines or transmissions?
Not as a service, no. Mark rebuilds engines for our own fleet, and that background is why the shop leans on diagnosis — but customer engine rebuilds and transmission internals go to a builder. Everything around the engine we handle in-house.
Tell us what it's doing
Call for anything down now. Send the details if you are pricing work or setting up a fleet account.