Detailed Service Procedures
Follow these structured procedures for critical maintenance tasks at the 48,000-mile service interval. These detailed steps help ensure consistent quality and thoroughness for essential service operations.
Transmission Fluid Change Procedure
- Run transmission to normal operating temperature
- Position vehicle on lift and secure appropriately
- Remove transmission pan and clean thoroughly
- Replace transmission filter and gasket
- Reinstall pan with new gasket and torque to spec
- Add manufacturer-specified transmission fluid
- Start engine and check for leaks
- Verify fluid level is correct with transmission at operating temperature
Brake System Service
- Remove wheels and visually inspect all brake components
- Measure brake pad and rotor thickness with proper gauges
- Inspect calipers for leakage and proper movement
- Flush old brake fluid and replace with DOT-specified fluid
- Bleed brake system to remove all air
- Check brake pedal feel and travel specifications
- Test brake function at low speed before returning to service
- Document measurements and component conditions
Cooling System Service
- Ensure engine is cool before beginning
- Remove radiator cap and open all drain points
- Collect and properly dispose of old coolant
- Flush system with manufacturer-approved cleaner if necessary
- Close all drain points and refill with correct coolant/water mixture
- Bleed cooling system of air per manufacturer procedure
- Pressure test system to check for leaks
- Run engine to normal operating temperature and recheck coolant level
Timing Belt Inspection/Replacement
- Refer to manufacturer service guidelines for specific procedure
- Remove necessary components to access timing belt
- Verify timing marks before removing old belt
- Inspect water pump and replace if recommended at this interval
- Replace timing belt tensioners and idler pulleys
- Install new timing belt and verify proper alignment with timing marks
- Reinstall all components and torque to specifications
- Test engine operation and check for unusual noises
Top 5 FAQs
- What does 48,000-mile service include? This includes full inspection of engine systems, drivetrain, brakes, HVAC, suspension, and emissions.
- Is this checklist FMCSA compliant? Yes, it is aligned with DOT FMCSA preventive maintenance requirements.
- How often should Schedule D service be done? Every 48,000 miles or every 6 months, whichever comes first.
- Can this checklist be customized? Yes, use the FleetRabbit app to modify items, intervals, and formats.
- Where can I use this checklist? Designed for trucks, buses, and large commercial fleet assets in the USA.