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.

Comprehensive Fleet Maintenance Services
Regular Maintenance: The Key to Longevity
Regular maintenance is the cornerstone of fleet longevity and efficiency. Our services include:
- Oil Changes and Fluid Checks: Regular oil changes and fluid checks are essential for engine health. We use high-quality oils and lubricants to ensure your fleet's engines run smoothly.
- Brake Inspections and Repairs: Brake systems are crucial for safety. Our technicians inspect and repair brake pads, discs, and fluid lines to ensure safety.
- Tire Maintenance: We provide tire rotations, alignments, and replacements. Proper tire maintenance improves fuel efficiency and safety.
- Advanced Diagnostics and Repairs: Utilizing the latest diagnostic tools, our skilled technicians can quickly identify and address issues, reducing downtime for your fleet. Our repair services include engine, transmission, and electrical system repairs.
Fleet Health Checks: Proactive Approach
We believe in a proactive approach to fleet maintenance. Our fleet health checks include a comprehensive assessment of each vehicle, ensuring they meet safety and performance standards.
Customized Fleet Maintenance Plans
Understanding that each fleet is unique, we offer customized maintenance plans tailored to your needs. These plans are designed to maximize uptime and efficiency.
Areas We Serve
In addition to Sullivan, MO, we proudly serve several nearby areas, including , Bourbon, MO; Cuba, MO; Clayton, MO; St. Peters, MO; Chesterfield, MO; Lebanon, MO; and Glenallen, MO.
Why Regular Maintenance Matters
Regular maintenance is not just about keeping vehicles running; it ensures reliability, safety, and cost-efficiency. Well-maintained fleets experience fewer breakdowns, which means fewer disruptions to your business operations.
The Importance of Professional Fleet Services
Entrusting your fleet to professionals like Harmon Truck Service means gaining access to expertise, specialized tools, and a commitment to quality. Our team stays updated with industry standards and technologies, ensuring your fleet receives the best care possible.
Schedule Your Comprehensive Fleet Services Today
At Harmon Truck Service, we provide top-notch repair and maintenance services for fleets of all sizes. Our commitment to quality, convenient location in Sullivan, MO, and service to surrounding areas make us the ideal partner for your fleet maintenance needs.
Partner with us and experience the peace of mind of having a reliable, efficient, and well-maintained fleet. Contact us today to discuss your fleet's maintenance needs and how we can help keep your business moving forward.

