About Us

Welcome to Harmon Truck Service, your premier destination for unparalleled truck servicing in Sullivan, MO, at 1411 South Service Road West. Since our inception in 2015, we have been committed to excellence, innovation, and customer satisfaction, carving out a niche in the truck service industry.

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Mobile mechanic performing DOT inspection in North Texas

Harmon Truck Service,

Initially known as Clarke Power Service, was rebranded and invigorated under the visionary leadership of Jason Harmon. A seasoned technician trained in the nuances of truck service, Jason took over the reins after the business encountered financial hurdles. His deep-rooted passion and expertise, honed over years of working on various projects, laid the foundation for what Harmon Truck Service is today.

Our humble beginnings saw Jason operating out of a service truck, tackling jobs that were often overlooked. This relentless drive and commitment to service excellence saw us rapidly grow. Today, our state-of-the-art facility boasts 12 service bays and a team of five highly skilled technicians, ensuring that your truck servicing needs are met with the utmost efficiency and expertise.

Dealer Level Software

In our quest to continually evolve and cater to a wider spectrum of needs, we have expanded our fleet services to include school buses and dump trucks.

At Harmon Truck Service, we pride ourselves on our unparalleled truck serviceability. Our technicians are meticulously trained on major brands like Freightliner, Detroit Diesel, and Cummins. We possess dealer-level software for brands including Peterbilt, Allison, Meritor Transmissions, International, Kenworth, Paccar, Volvo/Mack, and CAT engines, complemented by the corresponding tooling.

We proudly bring an array of safety systems to our service, which includes those related to vehicle stability, ABS, and OnGuard Collision.

Our facility is also uniquely equipped with a Hunter alignment machine and frame rack, setting us apart in the region.

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Open 24/7

We understand the importance of customer convenience, so we offer amenities like free coffee, shuttle services, after-hours key drop, and vehicle pickup/drop-off services. Our commitment to your comfort and satisfaction is paramount.

Our network of partnerships includes esteemed names like Midwest Bus Sales, Freightliner, Eaton Transmission, Gates Distributors, and DTNA Parts, ensuring that we provide the best in truck service and parts. We are at your service 24/7, with our shop number being 1-573-468-5138 and our 24-hour service line at 1-573-576-7684.

Contact Us

At Harmon Truck Service, we are not just servicing trucks but building relationships and driving the future of truck servicing and leasing. Visit us today and experience service that goes the extra mile.

Our Truck Repair Services

Bus in Sullivan area, MO

Bus & Coach Repair

At Harmon Truck Service, located in the heart of Sullivan, MO, we understand the critical importance of keeping buses and coaches in top condition. Our dedicated team of technicians specializes in comprehensive maintenance and repair services, tailored to meet the unique demands of your fleet.
Truck cabin

Custom Truck Modifications

Our commitment to excellence and innovation sets us apart as we cater to a diverse clientele, ranging from individual truck enthusiasts to large fleet operators. Our expert team specializes in transforming standard trucks into exceptional machines that meet and exceed your specific needs.
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DOT Inspection

Harmon Truck Service specializes in Department of Transportation (DOT) inspection services, ensuring your diesel trucks and fleets are road-ready and regulation-compliant.
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Fleet

At Harmon Truck Service, based in Sullivan, MO, we understand the critical role that fleet vehicles play in your business. Whether your fleet consists of heavy-duty trucks, commercial vans, or specialized vehicles, each unit is vital to your business machinery.
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General Diesel Repair

At Harmon Truck Service, we understand the critical role diesel trucks play in your business operations. Our comprehensive diesel repair services are tailored to meet the diverse needs of individual trucks and large fleets. With a focus on quality, efficiency, and reliability.
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Heavy Equipment Repair

We understand the pivotal role that machinery like Bobcats, skid steers, backhoes, dozers, and excavators play in your daily operations. Our commitment is to ensure that your equipment remains in peak condition, minimizing downtime and maximizing productivity.
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Mobile Truck Repair

At Harmon Truck Service, we understand the challenges of managing and maintaining diesel trucks and fleets. Our mobile truck repair services are designed to offer comprehensive solutions for your diesel truck needs.
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Preventive Maintenance

At Harmon Truck Service, we understand the critical role of diesel trucks and fleets in our economy. Our preventive maintenance services are designed to keep your diesel trucks and fleets running smoothly and efficiently.
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RV/Motorhome

Welcome to Harmon Truck Service, nestled in the heart of Sullivan, MO. We understand that your RV or motorhome is more than just a vehicle; it's your home away from home. That's why we offer top-tier repair and maintenance services to keep your mobile abode in peak condition.
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Roadside Assistance

At Harmon Truck Service, based in Sullivan, MO, we understand that every second counts when your diesel truck or fleet faces an unexpected breakdown. That's why we offer dedicated 24/7 emergency roadside assistance services, ensuring help is always a call away.
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Towing

We specialize in offering top-notch towing services for diesel trucks and fleets. Our partnership with a reliable third-party towing service ensures that your heavy-duty vehicles are in safe hands during transportation.
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Trailer Repair

We understand the crucial role your trailer plays in your daily operations, whether it's for business or personal use. Our expert team is dedicated to ensuring that your trailer is always in top condition, providing you with reliability and peace of mind.
Freightliner truck

Truck Parts

Whether you're managing a fleet of diesel trucks, operating heavy construction equipment, or ensuring the reliability of emergency vehicles, our comprehensive inventory caters to a wide range of vehicles, including trailers, motor homes, coaches, hy-rail trucks, and heavy equipment.
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Welding

We specialize in offering customized solutions to meet the diverse needs of your heavy-duty vehicles. Whether you manage a small fleet or run a major trucking company, our expertise in welding and fabrication is designed to keep your trucks running smoothly and efficiently.

Customers Reviews

What our customers say about our mobile/onsite truck & fleet repair services in The Colony, Texas.

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Contact us

Give us a call or request service via our service request form! We specialize in commercial truck repairs.