Download our Apps and get 14 Days Free Trial
PM Class C Comprehensive Maintenance Checklist for Mack Trucks
Introduction
The PM Class C maintenance service represents a comprehensive preventive maintenance milestone for Mack trucks, typically performed at 30,000-mile intervals or as specified by your fleet's maintenance program. This in-depth service includes all routine inspections plus extensive component checks, fluid and filter replacements, and critical system evaluations that go beyond standard maintenance intervals.
Following this comprehensive checklist ensures your Mack truck receives thorough preventive maintenance that addresses all major systems and components. The PM Class C service helps maximize vehicle uptime, extend service life, improve fuel efficiency, reduce the risk of roadside breakdowns, and maintain compliance with manufacturer warranty requirements and regulatory standards. By documenting this detailed maintenance service, fleet managers and technicians create a valuable maintenance history that supports resale value and demonstrates a commitment to safety and compliance.
Vehicle & Service Information
Pro Tips for Effective PM Class C Service
- Download ECM Diagnostic Data First: Before starting the PM service, connect to the truck's ECM with a Mack Premium Tech Tool (PTT) or equivalent diagnostic software to capture fault codes and performance data. This information can guide your service focus and identify issues that might not be apparent during visual inspection.
- Check Technical Service Bulletins: Before beginning work, review all Technical Service Bulletins (TSBs) applicable to the specific truck model, engine, and components. This helps identify known issues and manufacturer-recommended updates or repair procedures specific to the vehicle.
- Photograph Critical Components: Take before and after photos of components that show signs of wear or damage. This visual documentation helps track progressive wear and provides a clear record of conditions that might later develop into failures.
- Test DPF and SCR System Thoroughly: Mack's ClearTech emissions system requires special attention during Class C service. Perform a forced DPF regeneration and SCR system test to verify proper operation and identify any components nearing end of life before they cause downtime.
Engine System Maintenance
Emissions System Maintenance
Fuel System Maintenance
Cooling System Maintenance
Air Intake System Maintenance
Electrical System Maintenance
Transmission & Driveline Maintenance
Axle & Differential Maintenance
Brake System Maintenance
Steering & Suspension Maintenance
Fifth Wheel & Coupling Maintenance
Cab & Body Maintenance
Advanced Service Procedures
These specialized procedures are essential components of a thorough PM Class C service for Mack trucks. Proper execution of these technical tasks requires appropriate training, equipment, and documentation.
Mack MP Engine EGR Service
- Connect Mack Premium Tech Tool and run EGR system test
- Remove EGR valve assembly and inspect for carbon buildup
- Clean EGR valve with approved solvent in ultrasonic cleaner
- Inspect EGR cooler for restrictions or leaks
- Check differential pressure sensor and lines
- Verify EGR position sensor calibration
- Reinstall components with new gaskets
- Reset adaptive values using diagnostic software
DPF Forced Regeneration Procedure
- Connect diagnostic tool and retrieve DPF soot loading
- Verify coolant temperature at operating level
- Park vehicle in well-ventilated area with proper clearances
- Ensure DEF level is adequate for regeneration
- Initiate service regeneration using diagnostic tool
- Monitor exhaust temperature and backpressure
- Document regeneration parameters and completion
- Verify regeneration successful via soot load percentage
mDRIVE Transmission Service
- Connect diagnostic tool and check for fault codes
- Download transmission parameter settings
- Drain transmission oil (truck must be level)
- Replace oil filter and clean magnetic plug
- Refill with Mack-approved transmission fluid
- Check clutch actuator operation and adjustment
- Perform clutch adaptation procedure
- Test shift quality through all gears
Valve Adjustment Procedure
- Ensure engine is at room temperature (cold adjustment)
- Remove valve cover and rocker arm covers
- Rotate engine to TDC for cylinder #1
- Adjust valves according to firing order sequence
- Set intake valve clearance to specification
- Set exhaust valve clearance to specification
- Rotate engine 360° and recheck adjustments
- Reinstall covers with new gaskets
Service Progress
0% complete
Service Completion Verification
Technician Signature
Service Notes & Recommendations
Maintenance Intervals & Specifications
The following maintenance intervals and specifications are provided as general guidelines for Mack trucks. Always refer to the specific model's service manual for precise requirements based on operating conditions.
Mack MP Engine Maintenance Intervals
- Oil & Filter Change: 35,000-45,000 miles (Normal Duty)
- Fuel Filter Replacement: 35,000-45,000 miles
- Air Filter: Inspect at 15,000 miles, replace as needed
- Coolant Filter: 50,000 miles
- Valve Adjustment: 60,000 miles (MP7/MP8/MP10)
- DPF Cleaning: 250,000-400,000 miles (depending on operation)
- EGR Valve Cleaning: 150,000-200,000 miles
- DEF Filter: 250,000 miles or 3 years
Drivetrain Service Intervals
- mDRIVE Transmission Oil: 500,000 miles (Normal Duty)
- Manual Transmission Oil: 250,000-500,000 miles
- Front Axle Oil: 120,000 miles
- Rear Axle Oil: 120,000-240,000 miles
- Power Steering Fluid: 120,000 miles
- Driveline U-joint Lubrication: 10,000-25,000 miles
- Wheel Bearing Adjustment: 120,000 miles
- Clutch Adjustment (Manual): 50,000 miles
Brake & Air System Service
- Air Dryer Desiccant: Annually or 100,000 miles
- Air Tank Draining: Daily (automatic) or weekly (manual)
- Brake Lining Inspection: 25,000 miles
- Brake Adjustment: Check during PM service
- Brake Camshaft Lubrication: 50,000 miles
- Slack Adjuster Lubrication: 25,000 miles
- Air Compressor Governor Test: Every PM service
- System Air Leak Test: Every PM service
Fluid Specifications
- Engine Oil: Mack EOS-4.5, API CK-4 or FA-4
- Transmission Oil: Mack TO-2, SAE 50 (mDRIVE)
- Rear Axle Oil: Mack GO-J or GO-J Plus
- Power Steering Fluid: Automatic Transmission Fluid
- Coolant: Mack Bulldog Extended Life or equivalent
- DEF: Must meet ISO 22241 specifications
- Grease: NLGI #2 lithium complex
- Air System: Methanol-free alcohol evaporator fluid
Conclusion
Implementing this comprehensive PM Class C Maintenance Checklist for your Mack trucks is essential for maximizing vehicle uptime, extending service life, and maintaining regulatory compliance. This thorough preventive maintenance service addresses all major vehicle systems and helps identify potential issues before they develop into costly breakdowns or safety hazards.
For optimal maintenance management, consider implementing the FleetRabbit software to digitize your preventive maintenance process. The FleetRabbit platform allows maintenance managers to schedule PM services based on time, mileage, or engine hours; provides technicians with detailed digital checklists; tracks parts and labor costs; and maintains comprehensive service histories for each vehicle in your fleet. With the FleetRabbit APP, fleet managers can easily monitor maintenance compliance, forecast service needs, and maintain documentation for warranty and regulatory purposes.
Make comprehensive preventive maintenance an integral part of your fleet management strategy with the FleetRabbit software's complete maintenance management solution. Whether for regulatory compliance, warranty protection, or operational reliability, this digital approach significantly improves maintenance thoroughness and documentation while providing valuable data analytics to optimize your maintenance program and reduce overall operating costs.
© 2025 PM Class C Comprehensive Maintenance Checklist for Mack Trucks | Developed by FleetRabbit | Contact us at support@fleetrabbit.com for customized fleet maintenance solutions.