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24/7 Diesel Repair
Hawkeye Diesel Repair keeps commercial fleets and owner-operators moving across Dallas-Fort Worth. Our Mansfield, TX shop and mobile diesel repair crews handle everything from brake overhauls on Class 8 tractors to fuel system diagnostics on light-duty pickups, 24 hours a day, 7 days a week.
We fix what other shops send away. Our technicians carry OEM-level scan tools and stock common wear parts on every service truck. That means faster turnarounds for fleets running tight schedules on I-35W, I-20, and I-30 corridors.
Engine Diagnostics and Repair: We read fault codes on Cummins ISX15, Detroit DD13/DD15, and PACCAR MX-13 platforms. Our techs trace misfires, low-boost conditions, and injector failures back to root cause. Most diagnostic sessions take 1 to 2 hours.
Fuel System Service: High-pressure common rail (HPCR) injectors operate at 30,000+ PSI. Contaminated fuel or a worn CP4.2 injection pump can sideline a truck for days. We test rail pressure, replace injectors, and swap filters to restore proper fuel delivery.
Turbocharger Repair and Replacement: Variable geometry turbochargers (VGT) on modern diesel engines use adjustable vanes to control boost pressure. Carbon buildup on the VGT actuator is the most common failure point. We clean, calibrate, or replace turbo assemblies on Holset, BorgWarner, and Garrett units.
Transmission Service: We service Eaton Fuller manual transmissions, Allison 3000/4000 series automatics, and Detroit DT12 automated manuals. Work includes clutch adjustments, fluid and filter changes, shift solenoid replacement, and full rebuilds.
Aftertreatment and Emissions Repair: DPF regeneration failures, plugged diesel oxidation catalysts (DOC), and faulty DEF dosing systems cause costly derate events. We perform forced regeneration, replace NOx sensors, and clear aftertreatment fault codes to restore full engine power.
Electrical System Diagnostics: Diesel trucks rely on high-amperage starting circuits, chassis multiplexing, and CAN bus communication networks. We trace parasitic draws, repair alternator charging circuits, and diagnose body controller faults on Freightliner, Kenworth, Peterbilt, and International platforms.
DOT Inspections: We perform annual DOT safety inspections at our Mansfield shop. Each inspection covers brakes, tires, lights, steering, suspension, and coupling devices per FMCSA guidelines.
Preventive Maintenance Programs: Scheduled oil changes, coolant analysis, valve adjustments, and belt inspections reduce unplanned downtime. We build custom PM schedules based on your mileage intervals and OEM specifications.
Brake failure is the top reason Class 8 trucks get placed out of service during roadside inspections. Hawkeye Diesel Repair diagnoses and rebuilds both drum and disc brake systems on all commercial truck platforms.
S-cam drum brakes remain the most common foundation brake on commercial trucks and trailers. The system uses air pressure to push a brake chamber rod outward. That rod moves a slack adjuster, which rotates an S-shaped camshaft. The cam forces two brake shoes outward against the inside of the brake drum, creating friction to slow the wheel.
Common S-cam drum brake failures we repair include:
Our techs measure pushrod stroke with calibrated rulers, inspect drums with micrometers, and verify lining thickness at every service. Drum brake relines on a tandem-axle tractor typically take 3 to 5 hours.
Air disc brakes are now standard on the steer axle of most new Class 8 tractors from Peterbilt, Kenworth, and Freightliner. ADBs use a caliper and rotor design instead of shoes and drums. Air pressure acts on a brake chamber and slack adjuster to turn a power screw, which clamps brake pads against a rotor mounted to the hub.
ADBs stop a loaded tractor in roughly 215 feet from 60 mph. Comparable S-cam drums need about 225 feet under the same conditions. That difference matters when traffic stops suddenly on I-30 near downtown Dallas.
Common air disc brake repairs we handle include:
Pad replacement on an air disc brake steer axle takes 1 to 2 hours per side. We stock Bendix, Meritor, and WABCO replacement pads and rotors for same-day service.
Many DFW fleets run air disc brakes on their tractors and drum brakes on older trailers. This mismatch affects braking balance. ADBs provide consistent torque output across a wide temperature range. Drum brakes fade at lower temperatures, especially during stop-and-go traffic on I-635 or repeated descents.
Unbalanced brakes cause uneven wear, overheating on the tractor’s disc rotors, and reduced overall stopping performance. We inspect both tractor and trailer brakes together to identify and correct imbalances. Proper brake balance extends component life and improves driver safety.
Your truck’s suspension supports payload weight, absorbs road shock, and keeps axles aligned. A failed shock absorber or cracked leaf spring increases tire wear, reduces fuel economy, and creates unsafe handling conditions. Hawkeye Diesel Repair services both leaf spring and air ride suspension systems at our Mansfield shop and through our mobile diesel repair in Fort Worth and across DFW.
Leaf spring suspensions use stacked, curved steel plates bolted between the truck frame and axle. They handle heavy loads with a simple mechanical design. Light-duty pickups like the Ford F-250/F-350 and heavy-duty vocational trucks like the Mack Granite use leaf spring rear suspensions.
Leaf spring failures we repair regularly include:
A full leaf spring replacement on a tandem-axle heavy-duty truck takes 4 to 6 hours per side, depending on corrosion and bolt condition.
Air ride suspensions replace steel springs with rubber air bags (bellows) inflated by an engine-driven compressor. A height-control valve or electronic sensor maintains ride height as load weight changes. Class 8 over-the-road tractors like the Freightliner Cascadia and Kenworth T680 use air ride rear suspensions for smoother rides and better cargo protection.
Air ride suspension failures we see most often include:
Air bag replacement on a Class 8 tractor takes 2 to 4 hours per axle. We carry Firestone, Goodyear, and ContiTech air springs for common tractor applications.
Steering components take heavy abuse on DFW roads. We rebuild hydraulic power steering gears, replace drag links and tie rod ends, and correct front axle king pin wear. Loose steering on a loaded Class 8 tractor is a DOT out-of-service condition. We test for play at the steering wheel, inspect pitman arms and idler arms, and verify front end alignment after every steering repair.
Hawkeye Diesel Repair services every class of diesel truck. Here is what rolls into our Mansfield shop and meets our mobile crews across Dallas-Fort Worth.
These trucks handle personal use, towing, and light commercial work. Common models include the Ford F-250 and F-350 Super Duty, Chevrolet Silverado 2500HD and 3500HD, and Ram 2500 and 3500 with Cummins 6.7L or Duramax powertrains. We service CP4.2 injection pump failures, DEF system faults, and turbo actuator issues common to late-model pickups.
Used for delivery, utility, and local haul work. We repair the Ford F-450, F-550, and F-650, Ram 4500 and 5500, Chevrolet Silverado 4500HD and 5500HD, and International MV Series. These trucks often run Cummins B6.7 or Ford Power Stroke engines.
This includes the semi-trucks, tractor-trailers, and day cabs that move freight on Texas highways. We work on Freightliner Cascadia, Kenworth T680 and W900, Peterbilt 579 and 389, Volvo VNL, and International LT. These trucks run Detroit DD13/DD15, Cummins ISX15/X15, or PACCAR MX-13 engines. Our diesel engine repair team handles in-frame overhauls, head gasket replacements, and complete engine swaps.
Hawkeye Diesel Repair operates from our shop at 6330 Dick Price Rd, Mansfield, TX 76063. We also dispatch mobile diesel repair trucks to job sites, fleet yards, truck stops, and roadsides across the DFW metroplex. ZIP codes in our primary service area include 76063, 76028, 76036 (Mansfield and Crowley), 75051, 75052 (Grand Prairie), 76116, 76104, 76119 (Fort Worth), 75201, 75207, 75212 (Dallas), 76201, 76205 (Denton), and 76086, 76088 (Weatherford).
24/7 dispatch. Breakdowns do not follow business hours. Our dispatchers answer calls around the clock at 682-231-8338.
Shop and mobile service. Bring your truck to our Mansfield facility for scheduled work, or request a mobile tech for roadside emergencies and on-site fleet PM.
All makes, all classes. From a Ford F-250 with a dead CP4 pump to a Freightliner Cascadia needing a turbo actuator, we cover it.
Honest estimates. We diagnose before we quote. You approve the repair before we start the work.
Our mobile crews carry diagnostic scanners, brake tools, air system components, filters, belts, and common electrical parts. If your diesel truck is stuck on I-35, parked at a fleet yard in Dallas, or sitting at a construction site in Weatherford, we come to you.
Our mobile diesel repair service covers:
We serve Dallas, Fort Worth, Denton, Weatherford, Mansfield, Arlington, Grand Prairie, Midlothian, Waxahachie, and surrounding cities within 1 to 1.5 hours of our shop.
Call 682-231-8338 or fill out our online contact form to schedule service. We are available 24/7 for emergency repairs and roadside assistance.
Hawkeye Diesel Repair is a diesel truck repair company in Dallas-Fort Worth that keeps your trucks earning, not sitting.
When your vehicle breaks down, it may be challenging to find a company who can be there when you need it.
We repair light-duty pickups (Ford F-250, Ram 2500, Silverado 2500HD), medium-duty trucks (F-450 through F-650, International MV), and Class 8 semis (Freightliner Cascadia, Kenworth T680, Peterbilt 579, Volvo VNL). We also service dump trucks, reefers, tow trucks, and box trucks.
Yes. Our mobile diesel repair trucks respond to locations across DFW, including Dallas, Fort Worth, Denton, and Weatherford. We come to your job site, fleet yard, truck stop, or roadside location.
A drum brake reline on a tandem-axle tractor typically takes 3 to 5 hours. Air disc brake pad replacement takes 1 to 2 hours per axle. Exact time depends on component condition and parts availability.
The most common failures are worn brake linings, misadjusted slack adjusters, cracked drums, and failed return springs. On trucks with air disc brakes, worn pads and scored rotors are the primary issues. Brake system problems are the leading cause of out-of-service violations during DOT roadside inspections.
Yes. We replace air bags, compressors, height-control valves, and shock absorbers on all major Class 8 platforms. We also diagnose and repair air leaks in lines and fittings. Air bag replacement on a tractor typically takes 2 to 4 hours per axle.
Response time depends on your location and current dispatch volume. For trucks within 30 miles of our Mansfield shop, we typically arrive within 60 to 90 minutes. Call (682) 231-8338 for a current ETA.
Yes. We work with fleet managers running dozens of trucks and independent owner-operators with a single rig. We build PM schedules, handle emergency calls, and provide detailed service records for both.
Yes. Hawkeye Diesel Repair provides 24/7 service, including weekends and holidays. Our dispatchers take calls around the clock at (682) 231-8338.
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.