30K Service

Comprehensive 30,000-mile maintenance service including oil change, fluid level checks, filter replacements, and multi-point inspection for the 5.9L Cummins diesel engine.

Warnings

Tools required

Parts

• Engine oil filter × 1 — Use OEM specification or Fleetguard LF3977
• Fuel filter/water separator × 1 — Use OEM specification or Fleetguard FS19532 (early) or FS43255 (late)
• Air filter element × 1 — Use OEM specification
• Engine oil drain plug gasket × 1 — Copper or aluminum crush washer
• Fuel filter o-rings × 1 — Typically included with filter

Fluids

• 15W-40 diesel engine oil — 12 qt

Preparation

1. Park vehicle on level surface and apply parking brake firmly
2. Place wheel chocks behind rear wheels
3. Allow engine to cool for at least 30 minutes if recently operated
4. Raise front of vehicle with jack and support on jack stands rated for vehicle weight
5. Remove engine oil fill cap to assist drainage
6. Gather all required parts, fluids, and tools before beginning work

Procedure

1. 1

   Drain engine oil
   Position drain pan beneath oil pan drain plug located at rear driver's side of oil pan. Remove drain plug using appropriate socket and allow oil to drain completely (10-15 minutes). Inspect drain plug threads and replace crush washer. Reinstall drain plug and torque to manufacturer specification (typically approximately 37 ft-lbs for the 5.9L Cummins oil pan drain plug — verify exact spec for year).
2. 2

   Replace engine oil filter
   Locate oil filter on driver's side of engine block, mid-height. Use oil filter wrench to remove old filter by turning counterclockwise. Clean filter mounting surface on engine block. Apply thin film of clean oil to rubber gasket on new filter. Install new filter hand-tight only - turn until gasket contacts mounting surface, then 3/4 turn additional.
3. 3

   Refill engine oil
   Add 11 quarts of 15W-40 diesel engine oil through oil filler opening. Start engine and allow to run for 30 seconds to fill oil filter. Shut off engine and wait 5 minutes. Check oil level on dipstick and add remaining oil to bring level to full mark (approximately 1 additional quart). Inspect drain plug and filter for leaks.
4. 4

   Replace fuel filter/water separator
   Locate fuel filter canister on driver's side of engine. Place drain pan beneath filter. If equipped, open water drain valve at bottom of filter to drain water and relieve pressure. Use fuel filter wrench to remove filter canister by turning counterclockwise. Inspect and clean filter mounting base. Lubricate o-ring on new filter with clean diesel fuel. Fill new filter with clean diesel fuel to pre-prime system. Install new filter hand-tight until gasket contacts base, then tighten an additional 1/2 turn.
   ⚠Dispose of drained fuel and water mixture properly - do not mix with waste oil.
5. 5

   Prime fuel system
   Locate fuel primer pump on fuel filter head (rubber bulb or hand pump depending on year). Pump primer until firm resistance is felt (typically 20-50 pumps). On later models with electric lift pump priming, cycle the ignition key to ON (without cranking) per the year-specific procedure to run the lift pump and fill the filter. Verify the correct priming method for the specific fuel system (VE/P7100 hand primer, VP44, or common rail). Check for fuel leaks around filter base.
6. 6

   Replace air filter
   Open air filter housing located on passenger side inner fender. Release clips or remove wing nuts securing air box cover. Remove old air filter element and inspect housing for debris, dirt, or rodent damage. Clean housing interior with damp rag if needed. Install new air filter ensuring proper seating. Secure cover with all clips or fasteners.
7. 7

   Inspect and adjust drive belts
   Inspect serpentine belt for cracks, glazing, fraying, or missing ribs. Check belt tension - should have approximately 1/2 inch deflection at longest span between pulleys with moderate thumb pressure. If equipped with automatic tensioner, verify tensioner indicator is within operating range. If manual tensioner, adjust by loosening pivot and adjuster bolts on alternator or power steering pump. Replace belt if worn or damaged.
8. 8

   Lubricate chassis fittings
   Using grease gun, lubricate all grease fittings including: front suspension upper and lower ball joints if equipped with grease fittings (up to 4 fittings; note many are sealed/non-greaseable), tie rod ends (4 fittings), steering linkage (3-4 fittings), driveshaft u-joints (4-6 fittings depending on configuration), and slip yoke on rear driveshaft. Pump grease until fresh grease appears at joint seal or fitting purges. Wipe excess grease from fittings.
9. 9

   Check all fluid levels
   Check and top off the following fluids as needed: transmission fluid (check warm with engine running in park), transfer case fluid (fill plug on driver's side of case), front and rear differential fluid (fill plug on each housing), coolant level (overflow reservoir - cold level), brake fluid (master cylinder reservoir), power steering fluid (reservoir near firewall), and windshield washer fluid. Inspect areas around reservoirs and housings for signs of leaks.
10. 10

    Inspect brakes
    With front wheels removed, inspect brake pads through caliper window - minimum thickness is 3mm. Check brake rotors for scoring, cracks, or excessive wear. Inspect brake hoses for cracks, swelling, or chafing. Check rear brakes if rear wheels are accessible. Verify parking brake holds vehicle on incline.
11. 11

    Rotate and inspect tires
    Following 4WD tire rotation pattern (cross-rotate: left front to right rear, right front to left rear, left rear to left front, right rear to right front), rotate all four tires. Inspect tire tread depth (minimum 4/32 inch for safe operation). Check for uneven wear patterns, cuts, bulges, or embedded objects. Set all tires to manufacturer recommended pressure (check door jamb sticker).
12. 12

    Perform multi-point inspection
    Inspect the following: battery terminals for corrosion and tight connections; all lights for proper operation (headlights, brake lights, turn signals); wiper blades for wear; exhaust system for leaks, damage, or loose hangers; steering and suspension components for wear or damage; CV axle boots for tears or grease leakage; engine and transmission for fluid leaks; coolant hoses for cracks or soft spots.

Reassembly

1. Remove jack stands and lower vehicle to ground
2. Reinstall wheel chock
3. Install engine oil fill cap securely
4. Start engine and verify no warning lights remain illuminated
5. Test drive vehicle to verify proper operation and check for unusual noises or vibrations

Verification

• Start engine and verify oil pressure gauge shows normal pressure within 5 seconds
• Check for oil leaks at drain plug and filter after engine warms up
• Verify no fuel leaks at fuel filter during and after engine operation
• Confirm engine starts normally without extended cranking (fuel system properly primed)
• Check that all fluid levels remain at proper level after test drive
• Verify tire pressure is correct on all four tires
• Confirm no warning lights on instrument cluster
• Document service date and mileage for maintenance records

More procedures for this vehicle