Fleet Maintenance Checklist for Montana Trucking Companies

Managing a fleet in Montana presents unique challenges. From long distances between towns to extreme weather and rugged terrain, your trucks are under constant pressure. Without a proactive maintenance plan, minor issues can quickly turn into breakdowns, DOT violations, and costly downtime.

At Thompson & Sons Inc. in Glasgow, MT, we help commercial operators, local fleets, and long-haul companies maintain safe, reliable vehicles through customized service schedules and mobile support. Whether you run a few trucks or an entire fleet, this fleet maintenance checklist can help you stay compliant, extend equipment life, and protect your bottom line.

Why Fleet Maintenance Matters

A strong maintenance program reduces operating costs and helps ensure:

• Fewer unexpected breakdowns
  
  
• Longer equipment lifespan
  
  
• Lower repair costs over time
  
  
• Safer, more reliable drivers and vehicles
  
  
• Better fuel efficiency
  
  
• DOT compliance and fewer violations
  
  

When you operate in a state like Montana—with its steep grades, icy winters, and remote routes—fleet reliability isn’t just a goal. It’s a necessity.

Fleet Maintenance Checklist: What to Inspect and When

Below is a breakdown of essential inspection and maintenance items, organized by frequency. Use this as a base to build your own internal checklist or work with a maintenance provider like Thompson & Sons to manage it for you.

Daily or Pre-Trip Inspections (Driver responsibility)

• Check engine oil and coolant levels
  
  
• Inspect tires for wear, damage, and proper inflation
  
  
• Test all lights (headlights, brake lights, turn signals)
  
  
• Ensure mirrors, windows, and windshield are clean and clear
  
  
• Check brake function during startup
  
  
• Look for visible leaks beneath the truck
  
  
• Verify trailer connections and lighting
  
  
• Inspect load securement (if applicable)
  
  
• Test horn, wipers, and dashboard indicators
  
  

These items should be recorded as part of your driver’s DVIR (Driver Vehicle Inspection Report) and addressed immediately if problems are found.

Weekly Maintenance Checks

• Battery voltage and terminals
  
  
• Air lines and connections for leaks
  
  
• Belts and hoses for wear or cracking
  
  
• Suspension components for signs of stress
  
  
• Visual inspection of brakes and drums
  
  
• Fluid top-offs: power steering, washer fluid, transmission
  
  

Even small issues caught during a weekly inspection can prevent major failures.

Monthly or 5,000–7,500 Miles

• Change oil and replace filters (as required by duty cycle)
  
  
• Grease fittings and chassis lubrication
  
  
• Check and calibrate tire pressure
  
  
• Inspect differential fluid and transmission fluid
  
  
• Check air compressor function and air dryer
  
  
• Inspect exhaust system for leaks or rust
  
  
• Clean or replace air filters
  
  

Depending on the usage pattern and weather, these intervals may vary. Fleets operating in cold weather or hauling heavy loads may require more frequent service.

Quarterly or 15,000–25,000 Miles

• Perform full brake system inspection
  
  
• Inspect wheel bearings and hubs
  
  
• Inspect steering linkage and alignment
  
  
• Test coolant strength and radiator condition
  
  
• Inspect DPF and emissions systems
  
  
• Road test to monitor shifting, steering, braking, and engine response
  
  

Thorough inspections reduce long-term repair costs and are often required for DOT recordkeeping.

Annually (or per DOT Requirements)

• Annual DOT inspection (FMCSA-compliant)
  
  
• Full engine diagnostics and code scan
  
  
• Clean or replace DPF filters
  
  
• Check frame for cracks, rust, or misalignment
  
  
• Transmission service (fluid and filter)
  
  
• Replace fuel filters
  
  
• Test glow plugs and starting system (especially before winter)
  
  
• Review maintenance records and update vehicle service history
  
  

At Thompson & Sons, we perform comprehensive DOT inspections and maintain digital service records for fleet clients.

Maintenance for Montana-Specific Conditions

Operating in Montana introduces additional factors:

Cold Weather Prep

• Use winter-grade engine oil and fuel additives
  
  
• Inspect block heaters and battery heaters
  
  
• Replace worn wiper blades and add winter washer fluid
  
  
• Verify DEF system functionality to prevent freeze-up
  
  
• Test glow plugs and cold start systems
  
  

Long-Distance Routes

• Prioritize tire inspection and balancing
  
  
• Carry emergency kits and spare parts for remote travel
  
  
• Monitor suspension wear from uneven or gravel roads
  
  

Off-Road and Agricultural Use

• More frequent grease and undercarriage cleaning
  
  
• Suspension and U-joint inspections
  
  
• Adjust air filter change intervals due to dust exposure
  
  

We work with agricultural, logging, and utility fleets to build customized plans based on how and where their trucks operate.

Tracking Fleet Maintenance Schedules

Consistency is key. Whether you manage five trucks or fifty, having a tracking system prevents missed service and downtime.

Options include:

• Spreadsheets with mileage and dates
  
  
• Fleet management software (e.g., Fleetio, Verizon Connect, Samsara)
  
  
• Partnering with a local shop like Thompson & Sons to handle tracking and scheduling for you
  
  

We offer scheduled fleet maintenance programs with reminders, digital records, and volume pricing to help streamline your operations.

Real Example: Fleet Downtime Prevented in Valley County

A regional delivery fleet was experiencing repeated breakdowns and tire failures on rural roads. Thompson & Sons worked with their operations manager to implement a monthly inspection routine and switch to more durable tires. We also identified air system leaks that were overworking the compressor. Within three months, roadside calls dropped by 70 percent and maintenance costs were down year-over-year.

FAQs About Fleet Maintenance

Do you offer on-site fleet maintenance?

Yes. We offer mobile inspections, oil changes, brake checks, and emergency response across Glasgow and surrounding areas. Shop service is available for larger repairs.

How do I know how often to service my trucks?

Service intervals depend on usage, load, and environmental conditions. We help create a custom plan based on your fleet's mileage and operating environment.

What types of trucks do you service?

We service Class 6–8 commercial vehicles including semis, box trucks, dump trucks, flatbeds, and vocational equipment.

Can you provide DOT inspections for all vehicles?

Yes. We perform DOT inspections and provide documentation for compliance audits.

Do you offer volume pricing for fleets?

Yes. We offer discounted rates and priority scheduling for fleet clients under maintenance contracts.

Build a Better Maintenance Program with Thompson & Sons Inc.

A well-maintained fleet runs longer, safer, and more cost-effectively. Whether you operate locally in Glasgow or manage routes across the state, Thompson & Sons Inc. is your partner in reliable fleet maintenance.

Let us help you customize a checklist, schedule services, and keep your trucks ready for the road—no matter the season or terrain.

Schedule fleet service today – https://www.thompsonandsonsincmt.com/contact