Hummer H1 (2006+). Manual - part 18

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General Information, Lubrication and Maintenance

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Conventional Towing When Keys are not Available

If the vehicle doors are locked and the keys are not available you cannot determine that the transmission is in Park and the transfer
case is in “N” (Neutral). In these situations, you must use one of the following towing methods:

Use tow dollies at all wheels and flat tow,

Raise the vehicle front or rear and use tow dollies under the wheels not raised.

Recreational Towing

HUMMER H1 vehicles can be towed behind an RV if desired. A low-boy style vehicle trailer is best for this purpose. Flat towing
is not recommended.

JUMP STARTING

Preparation for Jump Starting

CAUTION: NEVER allow the two vehicles to touch each other when jump starting.

Park the vehicle with the booster battery close to the passenger door of your vehicle. Ensure that the vehicles do not touch each
other. Place the transmissions of both vehicles in “P” (Park), if applicable, and set all parking brakes.

Clean all battery terminals of excess corrosion before connecting jumper cables.

WARNING: ALWAYS remove ALL jewelry BEFORE handling batteries.

CAUTION: NEVER disconnect a vehicle’s batteries to jump start.

Turn off all electrical switches in both vehicles to prevent possible electrical damage to either vehicle’s electrical system.

Jumper Cable Connections

WARNING: NEVER lean over the batteries when connecting the jumper cables or allow the jumper cable clamps
to touch each other.

Connect one end of the positive jumper cable to the positive (+) terminal on the dead battery. It is best to connect to the positive ter-
minal of the battery closest to the windshield (Figure-1-15).

WARNING: ALWAYS make sure that the positive cable is hooked only to positive terminals and the negative to neg-
ative terminals or to a good ground.

Connect the other end of the positive cable to the positive (+) terminal on the booster battery.

Figure 1-15: Jumper Cable Connections

Connect one end of the negative jumper cable to the negative (-) terminal on the booster battery.

FRONT OF

VEHICLE

A/C COMPRESSOR
BRACKET

EGR VALVE

BOOSTER
BATTERY

NEGATIVE

JUMPER

CABLE

POSITIVE

JUMPER

CABLE

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WARNING: NEVER connect the other end of the negative jumper cable to the negative (-) terminal on the dead
battery.

Start the booster vehicle.

Connect the other end of the negative cable to a good metallic ground surface on the engine of your vehicle.
The best ground point is the A/C compressor bracket on the driver’s side of the engine (Figure-1-16).

Figure 1-16: A/C Compressor Bracket Ground Point

An alternate ground point is the exhaust gas recirculation (EGR) valve on the passenger side of the engine (Figure-1-17).

Figure 1-17: EGR Valve Ground Point

Starting the Vehicle

NOTE: Make sure the jumper cables are clear of any moving parts in the engine compartment.

With the booster vehicle running with a slightly increased engine speed, allow the dead battery to charge for a few minutes and
then start your vehicle. It may take a few tries before your vehicle starts. If your vehicle does not start after cranking for fifteen
seconds, stop the procedure. Cranking for more than fifteen seconds at a time seldom starts the engine and could cause dam-
age.

Once your vehicle starts, disconnect jumper cables.

If the engine stalls, repeat above procedure once, allowing battery to charge for approximately ten minutes. If the engine stalls
a second time, have the vehicle transported to an authorized service center.

NOTE: To ensure that the batteries are fully charged, have the batteries charged with proper battery charging equipment.

Disconnecting the Jumper Cables

WARNING: ALWAYS keep your hands away from moving parts in the engine compartment when disconnecting the
jumper cables.

Remove the negative (-) cable connected to the engine of your vehicle.

Remove the other end of the negative (-) cable from the booster battery.

A/C COMPRESSOR

BRACKET

FRONT OF

VEHICLE

EGR VALVE

FRONT OF

VEHICLE

11-1-05

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General Information, Lubrication and Maintenance

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Remove the positive (+) cable from the booster battery.

Remove the other end of the positive (+) cable from the battery on your vehicle.

After starting, turn off any electrical accessories that were accidentally left on, and allow the engine to run at a high idle speed to
recharge the batteries. For a “complete” charge, it may be necessary to use a battery charger to recharge the batteries.

MAINTENANCE SCHEDULE

Recommended Maintenance

Items described in Maintenance Inspection Groups A, B, and C are important to the proper operation, performance, and safety of
your vehicle.

It is important that maintenance items outlined in the schedules be performed at suggested intervals. Regular maintenance will
greatly improve vehicle reliability and longevity.

Normal Maintenance

The vehicle maintenance schedules reflect services required for normal operation. Normal operation includes city/highway driving
on hard surface roads with only minimal operation on unpaved road surfaces.

Maintenance After Severe Operation

Severe operation includes extensive off-road driving, salt water fording, commercial use, sustained operation in high ambient tem-
peratures, and trailer towing. This type of vehicle operation requires additional and more frequent service. If the vehicle is going to
be used frequently in severe operating situations, maintenance should be done on an hourly rather than a mileage schedule, as
shown in the Scheduled Maintenance Chart on page 1–27 . To keep track of the hours of severe operation, an optional hourmeter
can be installed at your HUMMER dealer.

Commercial use involves regular operation as a delivery or service type vehicle. Severe off-road use involves extended operation
on rough terrain, stream fording, salt water fording, or sustained operation in sand, mud, snow, or dirt surfaces. Severe operation
also includes prolonged daily operation in heavy traffic when ambient temperatures are high.

The additional maintenance required immediately after severe off-road operation is as follows:

• Wash the vehicle underbody, driveline and brake components, and all steering linkage and suspension parts with a low pres-

sure fresh water spray.

• If vehicle was driven over rough terrain, examine the underbody and driveline components for impact damage. Also check for

leaks and loose parts.

• If the vehicle was driven through deep water, examine geared hub, axle and vent lines for water contamination. If the lines

have become disconnected, these components may become water contaminated. Also inspect the axle and hub vents if
required.

• Check the front/rear brake pads for contamination by dirt, mud, sand, etc. Replace the pads if foreign material has become

embedded in the lining. However, if the pads are only wet from water, allow them to air dry, or drive the vehicle about a block
with the brakes lightly applied to heat and dry the pads.

• Check transmission and transfer case fluid levels and condition. Drain and replace the fluid in either assembly if water contam-

ination is evident. If water contamination proves extensive, it will also be necessary to replace the transmission fluid filter, and
flush the transmission fluid cooler and lines.

• Lubricate the steering linkage, ball joints, propeller shaft, and body lubrication points.

• Check the brake and power steering fluid levels and top off as needed.

• Examine the engine air filter. Replace the filter element if necessary and clean the air filter housing and dust unloader.

• Change engine oil and replace engine oil filter.

Maintenance Inspection Groups A-B-C

The inspection groups outline additional components to be checked at stated mileage intervals. The intervals are described in your
maintenance booklet. Perform necessary service repair, replacement, or adjustments as each inspection item is checked.

Maintenance Inspection 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.

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• 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 torque of wheel lug nuts.

• 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 condition of engine mounts and insulators.

• Inspect transmission/transfer case shift cables for wear, binding, distortion.

• Check fuel filter and drain/clean if necessary.

• Check CTIS operation. Verify that system inflates/deflates tires.

• Check winch operation and cable condition (if equipped). Free-spool out and pay-in at least 30 feet of cable.

• Check ball joints for wear.

• Test drive vehicle and complete a functional check of all systems.

• Check air cleaner.

Maintenance Inspection Group B:

• Inspect fuel injection pump, lines, and fittings for leaks or damage.

• Check battery voltage and condition.

• 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.

• Check wheel alignment.

Maintenance Inspection Group C:

• Inspect surge tank, radiator and shroud, A/C condenser, power steering and transmission coolers, charge air cooler, and all

hoses and fittings for security of mounting, leaks, obstructions, 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.

NOTE: Clean all dirt from caps and surrounding areas before opening to check ﬂuids.

SCHEDULED MAINTENANCE CHART

6,000 Miles (9,700 km) – 200 hrs normal use or 100 hrs severe operation

❐

Change engine oil and replace filter.

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Check items in Maintenance Groups A and B.

12,000 Miles (19,300 km) – 400 hrs normal use or 200 hrs severe operation

❐

Change engine oil and replace filter.

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