Menu
24/7 Diesel Repair
Dallas-Fort Worth · Class 7 & 8 heavy truck repair
A down tractor doesn’t earn. Hawkeye Diesel Repair repairs Class 7 and Class 8 heavy trucks across Dallas-Fort Worth, from sleeper tractors running I-20 to dump trucks working a job site in Mansfield. Our mobile crews roll 24 hours a day, 365 days a year. Our Mansfield shop has heavy-duty lifts rated for loaded commercial trucks, so the jobs that can’t be done on the shoulder get done under one roof.
Call (682) 231-8338. A live dispatcher answers, takes your location, and explains our rates before a truck rolls.
Truck down in DFW?
Typical DFW arrival: 30–75 min
24/7/365
Live dispatch, no phone tree
30–75 min
Typical DFW arrival for mobile calls
Class 7 & 8
Tractors, day cabs, and vocational trucks
Shop + mobile
One team from roadside to the lift
The FHWA classifies trucks by gross vehicle weight rating (GVWR). Heavy trucks start at Class 7.
| Class | GVWR | Trucks we see most |
|---|---|---|
| Class 7 | 26,001 to 33,000 lbs | Class 7 builds of the Ford F-750, Freightliner M2 106, International MV, and Hino L-Series. Box trucks, reefers, and wreckers. |
| Class 8 | Over 33,000 lbs | Freightliner Cascadia, Kenworth T680 and W900, Peterbilt 579 and 389, Volvo VNL, International LT, Mack Anthem. Vocational trucks like the Mack Granite, Kenworth T880, and Peterbilt 567. |
A loaded Class 8 combination can gross 80,000 lbs, the federal interstate limit. That weight is why heavy trucks need heavy-duty tools, parts, and lifts. Running a pickup or a lighter medium-duty truck? Our diesel truck repair page covers every class we service.
The same Cascadia fails differently in linehaul than it does in local dock work. We look at how your truck runs before we look at the fault code.
Long hours at highway speed put the load on the engine, the cooling system, and the aftertreatment system. We see turbo actuator failures, EGR cooler leaks, DEF and NOx sensor faults, and overheating on long summer pulls. When a sleeper truck goes down on I-20 or I-35, the driver needs a fix where the truck sits, not a tow and a motel. That is where our mobile diesel repair crews come in.
Short runs, constant stops, and dock time wear out brakes, starters, batteries, and air systems faster than highway miles do. Low exhaust temperatures during stop-and-go work also make it harder for the DPF to regenerate on its own. We run parked and forced regens and fix the sensor or dosing fault behind the derate.
Dump trucks, concrete mixers, and refuse trucks work off-road, carry heavy loads, and run PTO-driven equipment. They take a beating on suspension, frames, and air systems. We come to the job site for on-site repairs. Cracked frames and structural damage go to our Mansfield shop for welding and fabrication.
Box trucks, reefers, and wreckers in the 26,001 to 33,000 lb range often run Cummins B6.7 or L9 engines and Allison automatics. Common calls include DEF faults, no-starts, cooling leaks, and brake work on delivery routes.
Not every heavy truck repair needs a tow. Here is where each job usually gets done.
| System | What we fix | Usually done |
|---|---|---|
| Engine | Fault code diagnosis, injectors, turbos, EGR valves, head gaskets | Roadside or shop |
| Engine overhaul | In-frame and out-of-frame overhauls, engine swaps | Shop |
| Aftertreatment | Forced DPF regens, DEF pumps and dosing valves, NOx sensors, DPF cleaning and replacement | Roadside, shop for cleaning or replacement |
| Air system and brakes | Air leaks, brake chambers, slack adjusters, air dryers, glad hands | Roadside |
| Transmission and clutch | Clutch adjustment, Allison fluid and filter service, shift solenoids, full rebuilds | Roadside for service, shop for internal failures |
| Cooling | Hoses, belts, water pumps, thermostats, radiators, fan clutch checks | Roadside |
| Electrical | Starters, alternators, batteries, wiring, CAN bus and body controller faults | Roadside |
| Frame and structure | Welding and fabrication | Shop |
| Tires | Steer, drive, and trailer tire changes with jacks rated for Class 8 weight | Roadside |
Engines
Cummins X15 and ISX15, Detroit DD13, DD15, and DD16, PACCAR MX-13 and MX-11, International A26, and Caterpillar C13 and C15. On Class 7 trucks we also service the Cummins ISB 6.7 and ISL 8.9. Our technicians use OEM-level tools including Cummins INSITE, Detroit Diesel Diagnostic Link (DDDL), PACCAR ESA, and JPRO. Read more about our diesel engine repair and the derate codes we clear.
Transmissions
Eaton Fuller manual transmissions, Allison 3000 and 4000 series automatics, and Detroit DT12 automated manuals.
Brakes
Brake defects are the leading reason Class 8 trucks get placed out of service at roadside inspections. We repair S-cam drum brakes, air disc brakes, air ride and leaf spring suspensions, and steering gears. Our diesel truck repair page explains each of these systems in detail.
FMCSA requires every commercial motor vehicle to pass an annual inspection under 49 CFR 396.17. We perform annual DOT inspections at our Mansfield shop. Each one covers brakes, tires, lights, steering, suspension, and coupling devices.
If we find a defect, we can fix it in the same visit. That saves you a second appointment and gets your truck back in service with its paperwork in order. Pulling a trailer with problems too? Our mobile trailer repair team handles trailer brakes, ABS, lights, and landing gear.
Some heavy truck repairs need a lift, a press, or a full teardown. Those jobs come to our diesel shop in Mansfield, TX at 6330 Dick Price Rd.
What we have on-site:
If your truck can’t be fixed roadside, we set up a heavy-haul tow to Mansfield and keep you updated until it rolls out. The same team that diagnosed it on the shoulder finishes the job on the lift. You only pay for a tow if one is truly needed.
24/7 dispatch
Shop hours run Monday through Friday, 8:00 AM to 5:30 PM, and every other Saturday, 8:00 AM to 12:00 PM. Mobile dispatch runs 24 hours a day, 7 days a week.
One truck
You run one truck, so every hour parked comes out of your pocket. Our dispatcher explains the dispatch fee and hourly rate before anyone rolls. The technician scans the truck, explains the fix, and quotes the repair before starting. You get a written invoice listing parts, labor, and the repair performed. We accept Visa, Mastercard, Discover, American Express, cash, and fleet checks.
Fleets
Approve by phone. Fleet managers can approve repairs for their drivers without being on-site.
Digital records. You receive digital invoices and service records for each unit.
Fleet billing. Fleet billing accounts get consolidated monthly invoicing.
Scheduled maintenance. Fleets with three or more trucks can set up a maintenance contract. We come to your yard on a fixed schedule for oil changes, brake inspections, DOT pre-trip checks, and fluid service, with a digital inspection report after each visit.
Our mobile units leave from Mansfield, near the center of the metroplex. We cover I-20, I-30, I-35E, I-35W, I-45, I-820, I-635, US-287, and SH-360, including the AllianceTexas freight hub and the Inland Port of Dallas. Most mobile calls see a technician in 30 to 75 minutes.
We serve Fort Worth, Dallas, Arlington, Grand Prairie, Denton, Weatherford, and every city on our DFW service area page.
For ETAs by area, see our 24/7 roadside truck repair page, or call and we give you the arrival window.
Over 20 years
Repairing Cummins, Detroit Diesel, PACCAR, Caterpillar, and International engines.
Certified Diesel Technicians
Our technicians hold ASE diesel certifications and train on current engine platforms.
Rates before we roll
And a quote before any wrench turns.
Mobile and shop under one team
A roadside job that needs a lift doesn’t start over.
24/7 dispatch
Including weekends and holidays.
Google review
Stephen W.
“They were polite and incredibly knowledgeable and found the root of my problem in no time. Hands down will recommend and I am a lifelong customer from here on out. Thank you Mr Dustin and Mr Anthony”
Read more on our reviews page.
Quick answers for owner-operators, drivers, and fleet managers.
GVWR. A Class 7 truck is rated from 26,001 to 33,000 lbs. A Class 8 truck is rated over 33,000 lbs. Most semi tractors, dump trucks, and refuse trucks are Class 8. Larger box trucks and reefers are often Class 7.
Both. Our mobile crews handle most breakdowns where the truck sits. Internal engine and transmission failures, in-frame overhauls, frame repairs, and annual DOT inspections are done at our Mansfield shop, which has lifts rated for loaded commercial trucks.
Yes. We perform in-frame and out-of-frame overhauls, including pistons, liners, bearings, gaskets, seals, and rings. Engine swaps are also done at our Mansfield shop.
Often, yes. We scan the ECM, test the sensors, and run a parked or forced regeneration. If the filter is too loaded or a part has to be ordered, we tow the truck to our shop.
Yes. We perform annual DOT inspections at our Mansfield shop. Each inspection covers brakes, tires, lights, steering, suspension, and coupling devices.
Yes. We also repair diesel pickups and medium-duty trucks. See our diesel truck repair page for every class we service.
Broken down in DFW? Call (682) 231-8338 any time, day or night, and a live dispatcher will send a diesel mechanic to your truck. For shop repairs, DOT inspections, or fleet maintenance, contact us online or browse all our diesel repair services.
Hawkeye Diesel Repair is a mobile diesel mechanic serving the Dallas-Fort Worth metroplex. We get diesel drivers back on the road quickly and safely.