On-Highway Fleet Solutions That Deliver Expert repair, maintenance, and emergency response for commercial vehicles. Maximize uptime with 24/7 fleet support and OEM warranty coverage. Find A Location Quick Turnarounds, 
Minimal Downtime Rapid diagnostics and right‑first‑time repairs to keep trucks moving. Prioritized scheduling, stocked parts, and 24/7 response for faster returns to service. Find A Location Data‑driven PM programs tailored to duty cycles and fleets. Reduce breakdowns, extend asset life, and lower total cost of ownership with OEM‑spec service. Find A Location Keeping You on the Road OEM & Genuine Parts 
You Can Trust Exact‑fit components from authorized brands—backed by specs, torque values, and documentation. Protect performance, compliance, and warrant coverage on every job. Find A Location Thermo King Repair and Service Operations Website On Highway Tile Scaled E1762789655913 A Certified Technician Making A Quick Turnaround To Minimize Downtime 1920x736 Q70.webp UNITED ENGINES OKC NOV2024 32 FLIPPED.webp Thermo King OEM Replacement Parts

On-Highway Fleet Solutions That Deliver Expert repair, maintenance, and emergency response for commercial vehicles. Maximize uptime with 24/7 fleet support and OEM warranty coverage. Find A Location Quick Turnarounds,
Minimal Downtime Rapid diagnostics and right‑first‑time repairs to keep trucks moving. Prioritized scheduling, stocked parts, and 24/7 response for faster returns to service. Find a Location Rapid diagnostics and right‑first‑time repairs to keep trucks moving. Prioritized scheduling, stocked parts, and 24/7 response for faster returns to service. Keeping You on
the Road Find a Location OEM & Genuine Parts

You Can Trust Exact‑fit components from authorized brands—backed by specs, torque values, and documentation. Protect performance, compliance, and warrant coverage on every job. Find a Location Thermo King Repair and Service Operations Website On Highway Tile Scaled E1762789655913 A Certified Technician Making A Quick Turnaround To Minimize Downtime 1920x736 Q70.webp UNITED ENGINES OKC NOV2024 32 FLIPPED.webp Thermo King OEM Replacement Parts

On-Highway Service

Warranty‑safe repair and maintenance for heavy‑duty trucks and trailers—24/7, in‑shop or onsite.

Allison Transmission Service (Authorized)

Certified Allison specialists provide complete diagnostics, rebuilds, and repairs for all series transmissions.

Preventive Maintenance & DOT Inspections

Comprehensive PM programs and annual DOT inspections designed to reduce downtime and keep fleets road-ready.

OEM and Quality Aftermarket Parts

We stock genuine OEM and vetted aftermarket parts, including filters, sensors, rebuild kits, and more—for exact fit, performance, and fast turnaround.

Cummins Engine Service & Repair

We provide diagnostics and repair for Cummins engines, including troubleshooting, fuel and emission system service, and performance restoration for most models.

Detroit Diesel Engine Service

Factory-trained Detroit Diesel experts provide diagnostics, rebuilds, and maintenance for DD series engines, ensuring OEM-level performance and reliability.

Mobile Field Service & Roadside Assistance

Our mobile technicians provide on-site diagnostics, emergency repairs, and towing coordination.

Warranty & Authorized Service

As an authorized service center, we handle warranty repairs for Allison Transmission, Detroit Diesel, and other OEMs.

Clutch & Drivetrain Repair

From clutch replacements to driveline balancing, we deliver full drivetrain maintenance for medium- and heavy-duty trucks.

We Service All Makes and Models

Refrigerated Truck Unit

Box Trucks | Delivery Trucks

Refrigerated Truck Unit

Sweepers | Municipal Trucks

Imported From Staging

18 Wheelers

Refrigerated Truck Unit

School Buses | Beverage Trucks

Imported From Staging

Coaches | City Buses

OEM industrial parts and engine components

Parts & Service

Genuine OEM and quality aftermarket parts for trucks and trailers—exact fit, reliable performance, full warranty protection.

Diesel engine repair and service shop

Maintenance

Custom PM programs that cut downtime and costs—data‑driven schedules, inspections, and reporting across your fleet.

Industrial equipment rental and sales

Emergency Service

24/7 breakdown response for trucks, trailers, and reefers—fast dispatch, certified techs, and stocked service trucks.

Industrial equipment rental and sales

Fleet Service

We come to you with Factory‑Certified Technicians—OEM‑quality service at your site, backed by 120+ years of expertise.

FAQs

Do Factory‑Certified Technicians protect my warranty?

Yes. We follow OEM procedures and use genuine parts, with documentation for claim approval.

What diesel repair services does Stewart & Stevenson offer?

We provide diagnostics, engine repair, transmission repair, electrical repair, hydraulic system repair, preventative maintenance, and complete support for Class 4–8 commercial vehicles and heavy-duty diesel equipment.

Do you offer OEM diesel engine parts?

Yes. We supply genuine OEM parts for Detroit Diesel, Allison Transmission, DEUTZ, mtu, and other leading manufacturers.

Are your technicians certified for major OEM brands?

Yes. Our technicians receive factory training and certification for Detroit Diesel engines, Allison transmissions, DEUTZ engines, Volvo Penta systems, and mtu applications.

Do you offer fleet maintenance services?

Yes. Stewart & Stevenson provides scheduled maintenance and repair programs tailored for trucking companies, municipal fleets, logistics operators, and heavy-duty equipment users.

Do you offer 24/7 emergency service?

Yes—field and in‑shop support in supported regions.

Which brands do you service?

Stewart & Stevenson services vehicles from all major makes and models.

Why Stewart & Stevenson

Testimonial Stars Scaled

Customer service is always great with Adrian and Lalo up front.
New popcorn machine in parts pick up is a great addition too.

Austin Gordon
They guided me where to go to get what I needed. Thank you.
Omar Abdat

Excellent quick service

Daniel Gunnels

The guys at the counter are the best!!! Needed some filters and they helped me locate them, even though they didn’t have them. Best customer service hands down!!!

Isis Bunton

As always, when I have to go to this facility, I get top notch service and they treat their customers with respect. I know they’re gonna do a good job on my truck and that’s why they get my business.

Robert Lewis

Completely professional, thorough, and knowledgeable about their work, would recommend anyone to get services here.

Smak Jones

AMAZING Techs and service. Had mistakenly gone to freightliner first for a busted radiator to find out after 36hrs there’d be another 5-6 day wait. Called Mathew Richardson here he got me in same day and radiator repaired that day even staying late to do it. He went far above and beyond not only in the exceptional service and repair time but even found out my repairs were still under warranty when Freightliner tried saying they weren’t. If you need repairs in the Houston area this is definitely the place you should try first and if you do I’m sure it’ll be the last place you need to ask for repairs.

Bruce Kramer

Need Service Now?

Get priority scheduling from our 24/7 team.

Beyond The Highway: Industrial Grade Support

Industrial diesel and gas power generation systems

POWER GENERATION

Delivering dependable power generation equipment and service that performs under pressure and ensures uptime.

Natural gas microgrid power solutions

NATURAL GAS MICROGRIDS

Providing efficient, resilient energy solutions for commercial and remote applications.

Oil and gas equipment for energy operations

OIL & GAS

Powering operations even in harsh environments with durable, high-performance energy sector equipment.

Terex and industrial cranes

CRANES

Supporting safe, efficient lifting with reliable power and responsive service.

ADDA White
Find A Location.1
Construction site and equipment solutions

CONSTRUCTION EQUIPMENT

Maximizing productivity through tough, dependable equipment and full service support.

AtlasCopco White
DEVELON White
Power and pump, air compressor rental services

Power Rental

Offering flexible short- and long-term power and industrial Power Rental.

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