Is your fleet ready to shift into high gear? Hex 6 Diesel Services is here to turbocharge your fleet's performance with unparalleled services. From meticulous maintenance to advanced diagnostics, we empower your fleet to conquer every mile with ease and reliability.

Integrated Fleet Maintenance Solutions Is Our Business
Reinventing fleet maintenance for all industries, manage maintenance on all of your fleet - diversity - on-highway vehicles, off highway equipment, oil and gas equipment, and agriculture equipment all serviced by Hex 6. Optimizing fleet operations through maintenance partnerships.
Our fleet partnership program is a great benefit to commercial customers. A partnership with HEX 6 promises a personalized preventative maintenance schedule and lower costs of repairs, equating to lower operational costs, better outcomes in testing and inspections, and professional support when a mechanical issue arises.
In addition to top-notch customer service from our techs and office staff, our business partners have access to our customer portal. Not only does the customer portal provide businesses with direct communication with techs, progress updates on equipment repairs, and authorization abilities, but it also houses maintenance records for your entire fleet and tracks vehicle costs per mile. With the ability to submit maintenance requests at the click of a button, businesses are able to focus on what they do best, and Hex 6 will take it from there!
No matter the size, diesel vehicle fleets require specialized care to continue meeting the demands of the job, and there’s no one better than the team at Hex 6. With customized maintenance programs, mobile service trucks, and certified technicians, we are committed to providing the highest quality of service to keep your fleet running smoothly. Contact us today to schedule an appointment and experience the Hex 6 difference.
Types of Fleets We Service
It's not just on-highway vehicles that our team is more than capable of handling; we also offer fleet repairs for a range of on- and off-highway vehicles, including:
- Oil and gas industry equipment
- Agriculture equipment
- Municipality vehicles
- Heavy equipment
- Commercial on-highway trucks, trailers and tankers
- RVs and buses
- Diesel trucks
One shop. One contact. Every piece of your fleet covered.
What's Included in Fleet Service
We handle the full scope of diesel fleet maintenance and repair — scheduled or emergency, in-shop or on-site:
- Preventive maintenance programs - customized PM schedules aligned to your fleet's operating hours, mileage, and manufacturer intervals
- Engine repair, rebuild & overhaul - diagnostics and full engine service for all major diesel platforms
- Transmission & drivetrain service - Allison automatic, manual transmission, and clutch repair
- Brake system repair - air brake inspection, drum and disc service, brake chamber replacement
- Electrical & diagnostics - computerized diagnostics, wiring, ABS, sensor replacement
- EGR & DPF service - emissions system cleaning, repair, and replacement
- DOT inspection & compliance - inspection prep, safety system checks, post-repair re-inspection
- Hydraulic system repair - cylinder, pump, and hose repair and fabrication
- Cooling system service - radiator, water pump, coolant flush
- HVAC repair - cab air conditioning diagnostics and repair
- Suspension & steering - alignment, air suspension, steering component service
- Axle & differential repair - axle shaft, differential, and wheel bearing service
- Welding & fabrication - frame repair, custom bracket fabrication, structural repair
- Express lube & fluid service - fast-turn oil, filter, and fluid services to minimize downtime
- Mobile service - on-site repairs for equipment that can't come to the shop
Fleet Advantage Program
For fleet operators who want predictable costs and priority service, Hex 6 offers the Fleet Advantage program — a prepaid preventive maintenance membership designed to keep your fleet on schedule and your costs under control.
Fleet Advantage members receive:
- Reduced labor rates on all covered maintenance and repairs
- Personalized PM schedule built around your fleet's specific vehicles, operating hours, and service intervals
- Priority scheduling - Fleet Advantage members jump the line when your equipment needs immediate attention
- Dedicated account support - one point of contact who knows your fleet
- Full maintenance history - all service records stored and accessible through the Hex 6 customer portal
- Cost-per-mile tracking - monitor fleet operating costs across every vehicle in your account
- Multi-fleet coverage - on-highway trucks, off-highway equipment, ag machinery, and buses all under one program
Fleet Advantage is built for operations that need more than a repair shop - they need a maintenance partner.
Customer Portal
Fleet managers don't have time to chase down repair updates by phone. Our online customer portal gives you full visibility into your fleet's maintenance and repair status in real time:
- Direct communication with technicians - message the tech working on your equipment without playing phone tag
- Photo documentation - techs upload photos of diagnosed issues so you can see exactly what's being repaired and why
- Quote review & authorization - approve repair quotes from your desk or your phone before work begins
- Real-time repair status - track where every vehicle is in the repair process at any time
- Full maintenance records - complete service history for every unit in your fleet, all in one place
- Cost-per-mile tracking - monitor operating costs per vehicle to identify problem units before they become expensive
- One-click maintenance requests - submit service requests instantly without a phone call
Whether you're managing 3 trucks or 30 pieces of equipment, the portal keeps you in control without adding to your workload.
Mobile Fleet Service
Not every breakdown happens near Tyler. Our mobile service trucks extend Hex 6's capabilities across East Texas - bringing diagnostics, repairs, and maintenance to your job site, yard, or wherever your equipment is operating.
Mobile fleet service is particularly valuable for:
- Construction and oil & gas fleets operating at remote job sites
- Agricultural equipment that can't be trailered during peak season
- On-highway trucks that break down between Tyler and their destination
- Large equipment fleets where transporting units to the shop isn't practical
Mobile service is available as part of Fleet Advantage or on a per-call basis.
Government & Municipal Fleets
H2: Government & Municipal Fleet Service
Hex 6 is a woman-owned certified business, making us a qualified vendor for government entities, school districts, municipalities, and other public organizations that require certified supplier status in their procurement process.
We work with public fleet operators on:
- Scheduled preventive maintenance programs for municipal vehicle fleets
- DOT compliance and safety inspection support
- School district bus fleet maintenance
- Utility and service vehicle fleet repair
- Detailed documentation for government procurement and warranty requirements
Frequently Asked Questions
How many vehicles do I need to qualify for fleet service?
We work with fleets of all sizes - from a small operation with 3–5 trucks to large commercial fleets with dozens of vehicles and mixed equipment. Give us a call and we'll discuss what makes sense for your operation.
Can you handle mixed fleets - trucks and equipment together?
Yes. This is one of our core strengths. We service on-highway trucks, off-highway construction equipment, agricultural machinery, oil & gas equipment, and buses all under one account. Most shops can't say that.
Do you offer emergency or after-hours service for fleet breakdowns?
Call us at (903) 343-9527 for emergency situations. We'll assess the situation and dispatch mobile service if feasible, or advise on the fastest path to getting your equipment repaired.
How does the customer portal work for fleet accounts?
When you set up a fleet account with Hex 6, you get access to our online portal where you can submit service requests, track repair status, communicate with technicians, review and approve quotes, and access your full maintenance history - all in one place. It's available on desktop and mobile.
Are you able to service our fleet on-site at our yard or job site?
Yes. Our mobile service trucks can come to your facility for scheduled maintenance or emergency repairs. This is especially useful for large fleets where bringing every vehicle to the shop isn't practical. Ask us about setting up a regular on-site service schedule.
Can Hex 6 handle DOT compliance for our fleet?
Yes. We perform DOT inspections and can handle all required repairs to bring vehicles into compliance. We also provide the documentation fleet managers need for compliance records.
Fleet Repairs in Tyler, TX
Hex 6 Diesel Services is your go-to provider for reliable and efficient fleet services in Tyler, TX. Our commitment to quality and customer satisfaction ensures that your fleet receives the best care possible. Whether you need routine maintenance, complex repairs, or fleet optimization strategies, we are here to support your business.
Areas We Also Serve For Fleet Repairs in Texas
As well as Tyler, TX, we also proudly bring our fleet service to the following surrounding areas, Longview, TX, Kilgore, TX, Jacksonville, TX, Henderson, TX, Athens, TX, Palestine, TX, Sulphur Springs, TX, Marshall, TX, Nacogdoches, TX, Lufkin, TX, Corsicana, TX, Dallas, TX, Plano, TX, Garland, TX, Mesquite, TX, Terrell, TX, Greenville, TX, Mount Pleasant, TX, and Paris, TX.
Ready to Put Your Fleet on a Better Maintenance Program?
Whether you need a repair shop that can handle your whole fleet or you're ready to set up a Fleet Advantage membership, Hex 6 is ready to talk. Call us, request service online, or use our portal to get started.



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