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Hummer Knowledge Base

The Hummer Knowledge Base

18,000-mile Service:

My truck is in the shop for the 18,000 service, and I was wondering just what services needed to be performed.

18,000 miles:

  • Change engine oil and replace filter.
  • Clean or replace air filter(s).
  • Replace fuel filter (gas).
  • Replace fuel filter element (diesel).
  • Check items in Maintenance Groups A and B.

Maintenance Group A:

  • Check fluid levels and condition for power steering pump, cooling system (reservoir and surge tank), brakes, transmission, transfer case, geared hubs and axles.
  • Check CDR valve for oil saturation (Diesel).
  • Inspect condition of control arms, springs and shock absorbers.
  • Check tire wear and condition.
  • Lubricate all grease fittings and body lubrication points.
  • Inspect geared hubs for leaking seals or damage.
  • Inspect service brakes and parking brake.
  • Check axles for leaks or damage.
  • Check wheel bolt and nut torque.
  • Inspect condition of geared hub and axle vent lines.
  • Inspect condition of transmission and transfer case vent lines.
  • Inspect U-joints for wear or missing/damaged grease fittings.
  • Inspect transmission/transfer case shift linkage for wear, binding, distortion.
  • On gas engine and non-turbo models, inspect accelerator linkage for wear, binding, loose/excessive play.
  • Inspect condition of engine mounts and insulators.
  • Check ignition timing (Gas engine only).
  • Check fuel filter and drain/clean if necessary (Diesel).
  • Check CTIS operation. Verify that system inflates/deflates tires.

Maintenance Group B:

  • Inspect fuel injection pump, lines and fittings for leaks or damage (Diesel).
  • Check battery voltage and condition. Clean battery exterior with ammonia/water or baking soda/water mixture.
  • Inspect serpentine belt condition.
  • Inspect exhaust system and shields.
  • Inspect and rotate tires.
  • Inspect halfshaft boots and ball joint seals.
  • Inspect condition of steering column, U-joints, tie rods, steering arm, center link and idler arm.
  • Check fuel tank vent line filter.
  • Inspect condition of frame rails and crossmembers.
  • Check A/C system operation.


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