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The Service Company

Heavy-Duty Truck Repair & Parts Source in Southwest Ohio

Truck Repair Shops in Covington, Dayton, Greenville, & Springfield, OH

The Service Company proudly services Southwest Ohio with 4 state-of-the-art truck repair shop locations.  Since 1978, we've been providing top-rated heavy-duty truck repair and maintenance services & have been a leading heavy-duty truck parts source. With a dedication to technology and training, our diesel mechanic team continues to grow and remain industry leaders. Get in touch with us today to schedule the services you require!

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Expert Truck Repair & Maintenance Since 1978

The Service Company's story starts in 1978, when Paul Todd stepped out and bought a small gas station in Covington, Ohio to start his truck repair business. Through hard work and dedication to customers, The Service Company moved across town to a larger facility in 1987.  They soon outgrew that facility and added on to it in 1996 and again in 2006, finally moving their Covington location into a new 20,000 sq/ft facility in 2015.

In 2005, they stepped out and started their Greenville, Ohio location to service our customers in the Darke County area.  That facility has also grown over the years to feature a full service facility with 12 service bays and large parts display area where they help their customers out with all of their parts and truck tool needs.

2016 brought their 22,000 sq/ft Dayton, Ohio facility onto the scene. This location has grown into another busy location, allowing The Service Company to help take care of the Dayton area customers.

Mechanic from The Service Company in Dayton, Ohio

The #1 Choice for Heavy-Duty TRUCK 
& EQUIPMENT Repairs in Ohio

Our Heavy-Duty Truck Services

We provide a one-stop, complete truck repair solution with a large facility, experienced staff, and vast selection of parts both in-store and accessible throughout our partner network.

Semi-truck diesel repairs from The Service Company

Our Heavy-Duty Truck Repair Services

Axle Repair

Your axle should be monitored for misalignment and straightened from time to time in order to ensure that your truck is operating as efficiently as possible. The Service Company has 3 convenient locations so that we can be sure to provide quality axle service. You can rely on our certified technicians to maintain your truck’s axle so that you can enjoy a smoother ride and your vehicle will have a longer lifespan. 

Brake Repair

Your brake system involves many different components, and each one has to function correctly to keep you and others safe. Operators know without a doubt that your truck’s brakes are a key component that should never be overlooked. Worn brakes can make it difficult to slow, turn, stop and control your vehicle.‍ At The Service Company, our technicians are here to make sure you can always rely on your vehicle’s brakes.

Coolant System Repair

One of the primary functions of coolant is to regulate heat within the cylinder head and engine block. The coolant system is designed to circulate a cooling medium which absorbs heat from the engine and dissipates it through a heat exchanger (i.e., a radiator or cooler).

DOT Inspection

DOT inspections are required by the US Department of Transportation and can include vehicle, load, driver and documentation assessments. They are performed on all commercial vehicles that weigh over 10,000 pounds.

Diagnostics & Electrical Repair

Modern diesel engines are more intricate than ever, and while they are remarkably dependable, they do require regular maintenance and service to ensure prime performance. When your truck develops an issue, you need it diagnosed, serviced and repaired quickly so you can get back on the road and back to work.

Driveline Repair

Your heavy-duty truck’s driveline is an essential part of your truck’s controls. It connects the transmission to the axles and transfers the power from the engine to the wheels. At The Service Company, we can handle all of your driveline maintenance and repairs requirements and get you back on the road, moving in the right direction.


The EGR and DPF system in your heavy-duty truck work together as part of your emissions system to limit the output of harmful exhaust.

Engine Repair & Overhaul

At The Service Company, our facilities are equipped to overhaul or repair all types of ageing diesel engines. From headgasket replacement to a complete engine overhaul, our team will work with you to find the best solution for your needs and budget.

Exhaust System Repair

A good truck exhaust service includes a proper maintenance schedule and regular inspection of the exhaust system. Our professional experts are available for consultations and information at any time.

Express Lube

To ensure your vehicle is running safely and efficiently, proper maintenance is crucial. This includes regular visits to our express oil and lube shop. When you stay on top of your truck’s lube and oil changes, your vehicle components have the necessary protection to keep running properly. This results in your truck lasting longer, driving smoother, having better fuel economy and it saves you money in extensive repairs down the road.

HVAC System Repair

Are you noticing that your truck’s struggling to manage heating, cooling or ventilation? Whatever the weather, we’ve got you covered. Our technicians recognize that there are many possible issues that can arise with a heavy-duty truck’s HVAC system, and these can often be challenging to diagnose. Using industry-advanced technology, our team of trained mechanics can quickly and accurately identify your HVAC system issues before making any repairs or recommendations. We aim to cure the issue and not just patch the symptom.

Oil & Fluid

The key to keeping your heavy-duty truck running at its peak performance is proper maintenance. One of the essentials for ensuring the longevity of your truck is regular oil changes and fluid checks. Proper lubrication of your truck’s moving components is crucial for your engine to run correctly and to promote its longevity. Trust our team for all your oil & fluid needs.

Suspension Repair

Your heavy-duty truck’s suspension system helps your wheels to remain in even contact with the road, smooth over potholes, rough roads, or off-road terrain so that you can brake, steer, and safely control your vehicle. The suspension system provides your vehicle with a cushion against the shock and impact of the road surface. A suspension system that functions correctly helps stabilize your truck, smooths the ride, and maintains the proper axle spacing and alignment. Our team can maintain your vehicle’s suspension.

Tire Repair

Flat tires can be a serious interruption to your work, but more importantly, a flat tire can be a serious threat to your safety on the road. Unfortunately, fixing a flat or servicing an old tire is just part of life on the road. The Service Company can help determine the best approach to either repairing or replacing your tires. We have the capability and inventory to help with most truck tire needs.

Transmission & Clutch Repair

Correctly diagnosing and repairing transmission issues requires experience and the right tools. Most transmissions in today's commercial trucks have electronic modules to help with efficiency and performance. If you are experiencing transmission drivability issues, you can often avoid rebuilding the entire transmission by correctly diagnosing what is causing the issue. Count on us for your transmission & clutch repair needs.

Additional Diesel Mechanic Services

Fleet management services delivered by diesel mechanic in Covington, Ohio

Fleet Management

Managing a fleet of medium-duty vehicles is a complex task. At The Service Company, we understand the challenges fleet managers face. That's why we offer a comprehensive suite of fleet management services in Greenville, Ohio. Our services are designed to enhance the efficiency of your fleet, reduce costs, and ensure compliance with regulations.

Mechanic doing repair of a heavy duty diesel truck at The Service Company

General Diesel Repair

We take pride in making sure that your diesel truck continues to be asset to you rather than a financial burden, which is why you can always expect industry-leading service, quality diesel repairs, approachable customer service and honest assessments of your heavy-duty truck.

Diesel mechanic performing medium duty truck repairs in Dayton, Ohio

Medium-Duty Truck Repair

Operating in Dayton, Ohio, our mechanics here at The Service Company are committed to providing quality medium-duty truck repair services. Our focus and top priority is to help you maintain your fleet of medium-duty vehicles and keep your operation moving. Here's a closer look at the various services we offer.

Mechanic doing Onsite Heavy Duty Truck Repair at The Service Company

Mobile Truck Repair

At The Service Company, we understand that taking your vehicle off the road or moving off-location means more downtime. So we come to you. Your heavy-duty truck should never be down for days or need to drive long distances for service. We help you to maximize uptime by eliminating both waiting times and long-distance service trips.

Mechanic performing Preventive Maintenance (PM) service at The Service Company

Preventive Maintenance

At The Service Company, we create a preventative maintenance schedule that includes regular inspections which are designed to prolong the lifespan of your truck. This maintenance schedule proactively identifies and corrects potential problems before they become larger and more costly.

Heavy Duty Truck Roadside Service at The Service Company

Roadside Assistance

There is quite possibly nothing more stressful than being broken down and stranded at the side of the road. The Service Company recognizes this and offers heavy-duty truck roadside services during our regular business hours within a 25-mile radius of our shop in Dayton OH. Our team is reliable, reputable, and prompt! Working quickly in emergency situations to get your rig safely assessed and repaired. 

Heavy Duty Truck Towing Service at The Service Company


Dealing with an accident with a heavy-duty vehicle is stressful enough so you shouldn’t also have to worry about trying to find a reputable towing service that has the ability to provide you with the result you’re looking for. That’s why The Service Company offers our towing services within a 25-mile radius of our 3 locations in Covington, OH., Dayton, OH., and Greenville, OH.

Mechanic is doing truck wheel alignment at The Service Company

Truck Alignment

Professional truck alignment ensures that your tires meet the road at the proper angle which increases the durability and efficiency of your tires. For optimal performance, proper truck alignment prevents your vehicle from pulling in different directions, creating a safer and more comfortable journey while maintaining fuel efficiency and decreasing uneven wear on the truck’s tires.

Heavy-Duty Truck Parts

We source all of our parts from the best suppliers and stand behind every part we sell.

Why Choose Us for Your Parts Source?

Semi truck icon


We have years of practice finding the best OEM alternatives to save our customers costs.

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We really care about getting your equipment going and will do everything we can to get the part for you quickly.

Truck graphic


We know you are busy and don't have time to run around for parts.  We'll bring you your parts and even pick up samples if need be.

Delivery parts


We stand behind every part we sell with a 1 year warranty, no exceptions.

Inside the shop in Greenville at The Service Company

order Truck parts online!

Visit our online store or call our parts hotline at 937-808-4330 with questions or to place an order.

Check out What Our Recent Customers have to say

Lisa Bill
Google Review


Good quality service

Covington Location

Lisa Bill

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Good quality service

Joe Barker

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Only place I'll use.

Nick Rheinhardt

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Great knowledgeable people

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