Kenworth 10,000-Mile Service Maintenance Checklist

Follow this comprehensive maintenance procedure for Kenworth trucks at the 10,000-mile service interval.

Service Information

The 10,000-mile service interval (also known as A-Service) is a critical preventive maintenance point for all Kenworth trucks. Proper completion and documentation of this service helps maintain warranty coverage, ensure regulatory compliance, and extend vehicle life. Adjust interval based on severe duty operations or OEM specifications.

Fluid Changes and Filters

Complete these fluid and filter changes as part of the 10,000-mile service interval.

Engine Oil Service

  • Drain engine oil while warm
  • Replace engine oil filter(s)
  • Fill with appropriate oil grade: CK-4 or FA-4
  • PACCAR MX-13: 42 quarts capacity
  • PACCAR MX-11: 35 quarts capacity
  • Cummins X15: 44 quarts capacity
  • Verify proper oil level after running engine

Fuel System Service

  • Replace primary fuel filter
  • Drain water separator completely
  • Replace water separator filter (if separate)
  • Check fuel/water separator sensor
  • Inspect fuel lines for leaks or chafing
  • Prime fuel system per manufacturer procedure
  • Check for leaks after engine start

Cooling System Check

  • Inspect coolant level
  • Test coolant with refractometer for freeze point
  • Check coolant condition with test strips (pH)
  • Verify coolant is free of contaminants
  • Top off with appropriate coolant type
  • Inspect cooling system hoses
  • Check radiator cap pressure rating

Other Fluid Checks

  • Check power steering fluid level
  • Inspect transmission fluid level
  • Check differential oil level(s)
  • Verify clutch reservoir fluid level
  • Check windshield washer fluid
  • Verify DEF level and quality
  • Inspect for fluid leaks throughout vehicle

Lubrication Points

Grease these critical components as part of the 10,000-mile service interval.

Steering & Suspension

  • Lubricate tie rod ends
  • Grease drag link ball sockets
  • Lubricate king pins
  • Grease steering shaft U-joints
  • Lubricate spring pins (if equipped)
  • Grease suspension shackles
  • Lubricate slack adjusters

Drivetrain Components

  • Lubricate universal joints
  • Grease driveshaft slip joints
  • Lubricate clutch release bearing
  • Grease clutch cross shaft
  • Lubricate transmission linkage
  • Grease throttle linkage
  • Lubricate shift tower (if manual)

Chassis & Body

  • Lubricate door hinges
  • Grease door latches
  • Lubricate hood hinges
  • Grease hood latches
  • Lubricate fifth wheel plate
  • Grease fifth wheel pivot points
  • Lubricate sliding fifth wheel rails

Specialized Equipment

  • Lubricate PTO bearings (if equipped)
  • Grease auxiliary equipment points
  • Lubricate winch components (if equipped)
  • Grease outrigger points (if equipped)
  • Lubricate lift gate hinges (if equipped)
  • Grease crane pivot points (if equipped)
  • Lubricate dump body hinges (if equipped)

Inspection Items

Inspect these components as part of the 10,000-mile service interval.

Engine Inspection

  • Check all belts for tension and wear
  • Inspect all hoses for leaks or deterioration
  • Check engine mounts for tightness
  • Inspect air filter restriction indicator
  • Check crankcase breather system
  • Verify no exhaust leaks at manifold
  • Inspect fan hub/clutch operation
  • Check aftertreatment mounting security

Electrical System

  • Check battery condition and connections
  • Inspect alternator mounting and belt
  • Verify starter connections are tight
  • Test charging system output
  • Check all lights for proper operation
  • Inspect wiring harnesses for damage
  • Test dash gauges and warning lights
  • Check horn operation

Air System

  • Drain air tanks of moisture
  • Check air dryer operation
  • Inspect air compressor mounting
  • Test low air warning systems
  • Check air governor cut-in/cut-out
  • Inspect air lines for leaks or damage
  • Test air brake application/release
  • Verify air system build-up time

Brake System

  • Check brake pad/lining thickness
  • Inspect brake drums/rotors condition
  • Adjust manual slack adjusters (if equipped)
  • Check automatic slack adjuster operation
  • Inspect brake chambers and pushrods
  • Test parking brake operation
  • Verify ABS system operation
  • Check brake hoses for wear or leaks

Steering & Suspension

  • Check steering wheel free play
  • Inspect steering gear box mounting
  • Check steering linkage for wear
  • Inspect front springs and hangers
  • Check shock absorbers for leaks
  • Inspect air suspension components
  • Verify ride height is properly set
  • Check wheel alignment indicators

Drivetrain

  • Check transmission mounts
  • Inspect driveshaft for damage
  • Check U-joint condition
  • Inspect carrier bearing (if equipped)
  • Check differential mounting
  • Inspect axle seals for leakage
  • Verify axle breather operation
  • Check wheel bearings for looseness

Wheels & Tires

  • Check tire inflation pressures
  • Inspect tire tread depth and wear pattern
  • Verify wheel lug nut torque
  • Inspect wheels for cracks or damage
  • Check wheel hub oil level (if applicable)
  • Inspect valve stems and caps
  • Check for dual tire spacing/debris
  • Verify tire matching on dual assemblies

Cab & Body

  • Inspect cab mounting and air bags
  • Check windshield for damage
  • Test windshield wipers and washers
  • Inspect mirrors and adjustment
  • Check seat belts and mounting
  • Verify HVAC system operation
  • Test interior lights and controls
  • Check cab air filter (if equipped)

Operational Checks

Perform these operational tests as part of the 10,000-mile service interval.

Engine Performance

  • Check idle speed and stability
  • Verify proper throttle response
  • Check for unusual engine noise
  • Test engine brake function
  • Verify exhaust color under load
  • Check engine start time
  • Test cruise control operation

Transmission Function

  • Check for smooth shifting
  • Verify proper clutch free play
  • Test for transmission noise
  • Check for fluid leaks under load
  • Verify PTO operation (if equipped)
  • Test range selector function
  • Check transmission temperature

Electronic Systems

  • Connect diagnostic tool
  • Check for active and stored fault codes
  • Clear codes after addressing issues
  • Verify all ECU software is current
  • Test all electronic safety systems
  • Check DEF system operation
  • Verify emission system function

Road Test Evaluation

  • Check for unusual noises
  • Verify steering wheel centered
  • Test brake performance
  • Check for vibrations at various speeds
  • Verify transmission shifts properly
  • Test engine power under load
  • Evaluate overall vehicle performance

Documentation Requirements

Complete these documentation steps to finalize the 10,000-mile service.

Service Records

  • Record all fluid types and quantities
  • Document filter part numbers
  • Note actual odometer reading
  • Record engine hours
  • Document technician name/number
  • Note service date
  • Schedule next service interval

Fault Code Documentation

  • Record all active fault codes
  • Document stored/inactive codes
  • Note corrective actions taken
  • Record ECM parameters if adjusted
  • Document software updates performed
  • Note any diagnostic tests run
  • Save code scan report in file

Inspection Findings

  • Document components approaching wear limits
  • Note recommendations for future service
  • Record any deferred maintenance items
  • Document condition of major systems
  • Note any fluid leaks observed
  • Record tire tread depths
  • Document brake measurements

Customer Communication

  • Provide detailed service report
  • Document customer notification of findings
  • Obtain customer approval for repairs
  • Note any customer concerns addressed
  • Document next service date/mileage
  • Record any warranty concerns
  • Provide preventive maintenance recommendations
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