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HUMMER Service Schedule

Every 3000 Miles
• Change engine oil and replace filter.
• 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 tor•ue.
• Inspect condition of geared hub and axel 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.

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At 6,000 • 18,000 • 30,000 • 39,000 • 54,000 Miles:
• Change engine oil and replace filter.
• 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 axel 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.
• Replace fuel filter system
• Clean air filter
• 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.
• Inpect condition of frame rails and crossmembers.
• Check A/C system operation.

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At 12,000 • 24,000 • 36,000 • 48,000 Miles:
• Change engine oil and replace filter.
• 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 axel 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.
• Replace air filter.
• Replace fuel filter element.
• Change engine coolant.
• Change transmission and transfer case fluid.
• 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 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.
• Inspect surge tank, radiator and shroud. A/C condenser, power steering and transmission coolers, and all hoses and fittings for security of mounting, leaks, or damage.
• Inspect fuel tank, lines, and cap.
• Inspect all wiring harnesses for frays, splits, missing insulation, poor connections.
• Inspect power steering pump, power steering gear, hoses, lines, and fittings for leaks or damage.
• Check ignition wires (gas engine only).

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