Kenworth T680 Fleet Maintenance Checklist

Follow this structured procedure to ensure comprehensive maintenance of Kenworth T680 fleet trucks.

Scheduled Maintenance Procedures

Follow these structured procedures to ensure proper maintenance of your Kenworth T680 fleet vehicles.

PACCAR MX Engine Maintenance

  • Check engine oil level and condition
  • Inspect air filter and replace if necessary
  • Check coolant level and condition
  • Examine all belts for proper tension and wear
  • Inspect all hoses for leaks or deterioration
  • Check for fuel leaks around injectors and lines
  • Monitor engine diagnostic codes through DAVIE4

Transmission System Check

  • Check transmission fluid level and condition
  • Inspect clutch operation and adjustment
  • Examine shift linkage for proper operation
  • Check for leaks at transmission seals
  • Test transmission temperature during operation
  • Verify proper operation of transmission control module
  • Check for proper gear engagement and shifting

Brake System Inspection

  • Measure brake pad/shoe thickness
  • Inspect brake rotors/drums for scoring or cracking
  • Check air system for leaks (max 4 PSI drop in 1 minute)
  • Verify proper operation of slack adjusters
  • Test low air warning system functionality
  • Inspect brake chambers for damage or leaks
  • Check ABS system operation and fault codes

Fuel System Maintenance

  • Replace primary and secondary fuel filters
  • Drain water separator and check for contamination
  • Inspect fuel lines and connections for leaks
  • Check fuel tank mounting and condition
  • Clean fuel tank ventilation system
  • Test fuel pump pressure and volume
  • Verify proper DEF system operation

T680-Specific System Inspection Checklist

Verify the following components as part of your Kenworth T680 fleet maintenance program.

Electrical System

  • Test battery condition and charge level
  • Clean and secure all battery connections
  • Check alternator output voltage (13.8-14.2V)
  • Inspect all wiring harnesses for damage
  • Test starter motor operation
  • Verify operation of all lights and signals
  • Test dashboard indicators and warning lights
  • Check functionality of power accessories

Cooling System

  • Pressure test cooling system
  • Inspect radiator for leaks or blockages
  • Check coolant concentration and pH level
  • Test thermostat operation
  • Inspect water pump for leaks or noise
  • Examine fan clutch operation
  • Check radiator cap pressure rating
  • Verify coolant recovery system function

Exhaust & Emissions

  • Inspect exhaust system for leaks or damage
  • Check DPF filter status and regeneration cycle
  • Measure exhaust backpressure
  • Verify SCR system operation
  • Check DEF quality and consumption rate
  • Inspect exhaust manifold for cracks
  • Test EGR valve and cooler operation
  • Check emission system fault codes

Suspension & Chassis

  • Inspect air suspension components
  • Check frame rails for cracks or damage
  • Verify proper ride height adjustment
  • Examine shock absorbers for leaks or wear
  • Inspect spring hangers and bushings
  • Check U-bolts for proper torque
  • Test height control valves operation
  • Inspect crossmembers for damage

Steering System

  • Check power steering fluid level and condition
  • Inspect steering gear box for leaks
  • Measure steering wheel free play (max 2 inches)
  • Check steering linkage for wear or damage
  • Verify king pin and tie rod end condition
  • Test power steering pump pressure
  • Inspect steering damper operation
  • Check steering column U-joints

T680 Aerodynamic Features

  • Inspect condition of hood air dam
  • Check side extenders for damage
  • Verify roof fairing integrity
  • Inspect chassis fairings and skirts
  • Check aerodynamic mirrors function
  • Ensure proper bumper and air deflector alignment
  • Verify all fairings are securely mounted

Interior & Cab Systems

  • Test HVAC system operation
  • Check functionality of sleeper controls
  • Verify operation of all gauges and instruments
  • Test driver information display functions
  • Check comfort features (seats, bunks, refrigerator)
  • Inspect cab suspension and mounting
  • Test windshield wipers and washers
  • Verify all interior lights operation

Documentation & Records

  • Update maintenance records
  • Record all fluid types and quantities
  • Document all parts replaced
  • Note any diagnostic fault codes
  • Record mileage and engine hours
  • Update service interval tracking
  • Document technician observations
  • Maintain compliance with fleet requirements
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